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Looks Good, Reads Bad: Imaging 5–25-inch floppy disks on mismatched drives

https://digitalpreservation-blog.lib.cam.ac.uk/looks-good-reads-bad-imaging-5-25-inch-floppy-disk...
1•tigerlily•3m ago•0 comments

Show HN: Compyle – Lovable for Software Engineers

https://www.compyle.ai/
1•jmiran15•3m ago•0 comments

Peroxisomal metabolism of branched fatty acids regulates energy homeostasis

https://www.nature.com/articles/s41586-025-09517-7
1•PaulHoule•3m ago•0 comments

EU grills Apple, Snapchat, YouTube over risks to children

https://www.france24.com/en/live-news/20251010-eu-grills-apple-snapchat-youtube-over-risks-to-chi...
1•giuliomagnifico•6m ago•0 comments

Larry Sanger – Nine Theses on Wikipedia

https://larrysanger.org/nine-theses/
1•TurkishPoptart•6m ago•0 comments

China blacklists major chip research firm TechInsights following Huawei report

https://www.cnbc.com/2025/10/10/china-blacklists-major-chip-ai-research-firm-techinsights-analyze...
1•ilamont•7m ago•0 comments

Gch – a shell script to write better Git commit messages

https://github.com/jacksmithxyz/gch
1•fixedprog•10m ago•1 comments

Tesla pushes Tron: Ares ad inside its cars, upsetting owners

https://electrek.co/2025/10/10/tesla-pushes-tron-ares-ad-inside-cars-upsetting-owners/
4•terminalbraid•12m ago•0 comments

Good design needs no explanation

https://www.youtube.com/watch?v=-ueUb6PNwbs
1•chrmod•12m ago•1 comments

Illegible Nature of Software Development Talent

https://surfingcomplexity.blog/2025/10/08/the-illegible-nature-of-software-development-talent/
1•hackthemack•14m ago•1 comments

Show HN: GitHub for Robotics?

https://mechaverse.dev
3•victor_24•15m ago•2 comments

Apple and Google reluctantly comply with Texas age verification law

https://arstechnica.com/tech-policy/2025/10/apple-and-google-reluctantly-comply-with-texas-age-ve...
4•Cornbilly•16m ago•0 comments

Family's Home Has Stood for a Century – In Four Different Countries

https://www.nytimes.com/2025/10/10/realestate/slovenia-italy-portoroz-history.html
2•jibcage•16m ago•0 comments

A disenshittification moment from the land of mass storage

https://pluralistic.net/2025/10/10/synology/#how-about-nah
3•FromTheArchives•17m ago•0 comments

JVM stack is about to be massively modernized

https://medium.com/@singleton64/jvm-stack-is-about-to-be-massively-modernized-or-why-java-needs-t...
1•singleton11•19m ago•0 comments

Widespread Verizon Outage

https://economictimes.indiatimes.com/news/international/us/verizon-users-face-major-network-outag...
1•ckemere•21m ago•1 comments

The Buyer/Seller Gap in AI

https://substack.com/inbox/post/175818121
1•mathattack•27m ago•0 comments

Phones as a Fortress: 4th Amendment Castle Doctrine for the "Digital Home"

https://www.computerweekly.com/opinion/Our-phones-as-our-castles-can-His-Majestys-Government-enter
1•spectrumwonk•29m ago•1 comments

Gyro Camera – No More Shakey Pictures (1970) [video]

https://www.youtube.com/watch?v=ZO9PC8dnXdQ
1•xj•30m ago•0 comments

NSO to be acquired by U.S. investors, ending Israeli control of Pegasus maker

https://www.calcalistech.com/ctechnews/article/s1jgvmitgx
5•jmsflknr•30m ago•1 comments

FCC Restructures the Wireless Market into an Oligopoly

https://publicknowledge.org/chairman-carr-completely-restructures-the-wireless-market/
2•spectrumwonk•30m ago•0 comments

JUXT AI Radar

https://www.juxt.pro/ai-radar/
1•henrygarner•31m ago•0 comments

White House slams Trump's perceived Nobel peace prize snub

https://www.theguardian.com/us-news/2025/oct/10/trump-nobel-peace-prize-reaction
4•duxup•33m ago•2 comments

Show HN: DataNav – A personal AI data analyst

https://github.com/knoom0/datanav
1•moonk•34m ago•0 comments

Dangerous 'nitazene' opioids are on the rise: researchers are worried

https://www.nature.com/articles/d41586-025-03280-5
2•rntn•39m ago•0 comments

Multiple people dead or missing after blast at Tennessee explosives plant

https://www.theguardian.com/us-news/2025/oct/10/tennessee-military-explosives-plant-explosion
4•mellosouls•41m ago•0 comments

Three gripes about Go modules

https://www.jotaen.net/e3Jq5/three-gripes-about-go-modules/
1•jotaen•41m ago•0 comments

Show HN: Multiple choice video webgame experiment

https://www.bemmu.com/doored/
1•bemmu•42m ago•0 comments

Halloween Fonts and Coloring Pages

1•ahmetcadirci25•42m ago•1 comments

Ask HN: Why there are still no signs of increase in productivity anywhere?

4•pera•42m ago•7 comments
Open in hackernews

Ryanair flight landed at Manchester airport with six minutes of fuel left

https://www.theguardian.com/business/2025/oct/10/ryanair-flight-landed-at-manchester-airport-with-six-minutes-of-fuel-left-flight-log-suggests
231•mazokum•2h ago

Comments

SoftTalker•2h ago
Between overworked, understaffed ATC and undertrained pilots, I'm expecting some major disasters in the coming years.
cschmatzler•2h ago
This had nothing to do with any of that tho.
SoftTalker•2h ago
Pilots are ultimately the ones who are responsible for when and where to land, when to divert, and how much fuel to take along.
ItsBob•2h ago
In this case, they likely had adequate fuel for, the usual eventualities but the weather in Scotland was particularly bad that night across the whole country (source: I live near Prestwick airport).

Either Edinburgh (on the east coast) or Prestwick (on the west coast) are ok (one or the other or both) but in this case neither was suitable so the nearest was Manchester - definitely an edge-case.

I don't know how much fuel they had, or if they could've fitted any more on the plane but it was unusual circumstances.

There was a military plane right behind it with the same issue that night too.

Spare_account•1h ago
Were these pilots undertrained?
doitLP•2h ago
Why? Is ATC a problem in other countries than the US? Are they also under training pilots? If anything RyanAir with its flamboyant history of cost cutting (CEO always threatening to charge for use of the onboard lavatory) seems a more likely source than the flying infrastructure itself.
xnorswap•2h ago
Ryanair has a very good safety history, among the highest in the world.

They make outrageous claims for publicity, and their customer experience is all about hidden extras and "gotcha" pricing, but I don't think they fuck around when it comes to safety.

They know that with their reputation they would be sunk if they did have a major incident.

intrasight•1h ago
So it's sunk? They just had a major incident.
jacquesm•1h ago
Let's wait for the investigation results before coming to that conclusion.
jakub_g•1h ago
It's both true that Ryanair has very good safety record, and that in the past there were incidents with them landing on low fuel.

https://www.eurocockpit.eu/news/mayday-mayday-wins-over-ryan...

> In 2012 and 2013 “Brandpunt Reporter” broadcasted a two episode TV investigation in which Ryanair pilots, speaking anonymously, raised concerns about the airline’s fuel policies and company culture. The pilots revealed that the company may be exerting pressure on them to minimize the amount of fuel they take on board – a practice which limits significantly the fuel costs for the company but could jeopardise safety in certain circumstances. The direct reasons for this broadcast were 3 emergency landings of Ryanair aircraft in Valencia Spain on the 26 July 2012, within a short timeframe due to low fuel levels.

stuartjohnson12•2h ago
Closely followed by the ritual lampooning of some senior middle managers who by the fish-in-barrel method were discovered to not be doing very much.
dghlsakjg•2h ago
What indication is there that our pilots are undertrained?

I am just a PPL, and that was not an easy thing to accomplish (most pilots complete 50% more hours than required before they are able to pass that test), but my impression is that western training standards for commercial pilots are incredibly high, and the safety record seems to back that up.

psunavy03•2h ago
Internet vibes, basically.
bombcar•2h ago
Its arguably too high, constraining the supply of pilots, and the supply of well-paying jobs, resulting in things like Colgan Air Flight 3407.
dghlsakjg•1h ago
In the US, I think that's probably true especially using hours as a proxy for training.

The EU has shown us that you can safely have far fewer hours.

As a pilot I do think that nothing replaces butt in seat, but I also think that 1500 hours of instructing/aerial surveying/hour building is well into the diminished marginal returns area.

the_mitsuhiko•2h ago
One of the problems with modern internet discourse is there is an implicit assumption that the problem of one country is automatically the problem of another country.
afavour•2h ago
Flights operate internationally?
Twirrim•2h ago
Yes, between other countries without having to go via the US!
bilekas•2h ago
Internationally yes, but Ryanair don't travel transatlantic.
bilekas•1h ago
> Between overworked, understaffed ATC and undertrained pilots, I'm expecting some major disasters in the coming years.

Maybe in the US, but this story is based in Europe, each country maintains a regulated standard and there are no EU wide disruptions that have ever happened to the best of my knowledge. Also Ryanair don't travel transatlantic flights.

jakub_g•1h ago
Three weeks ago in Nice, France it was a fraction of a second away from two A320s crashing [0] and possibly hundreds of deaths, similar to Tenerife disaster [1].

Investigation is ongoing and many factors are at play (bad weather, extra work for ATC due to that, confusing lighting of runways etc) but also, from French media reports, there used to be 15 people per shift 5y ago in Nice ATC, now there are just 12, and traffic is higher.

Many people left the profession during Covid and haven't been replaced.

[0] https://avherald.com/h?article=52d656fd&opt=0

[1] https://en.wikipedia.org/wiki/Tenerife_airport_disaster

bilekas•6m ago
Mistakes and disasters happen, unfortunately the safety we have while flying today has been written in blood, but there is no major understaffed ATC and undertrained pilots in general as mentioned.
arp242•1h ago
I've never heard of any of these problems with RyanAir. They treat you as less than cattle and generally their service is shit, but I'm not aware of RyanAir being unsafe.

Actually, in a quick check it seems the total fatality count for RyanAir is zero, with only two (on-fatal) major incidents (2008, 2021). That's seems a pretty good track record considering the amount of flights they do.

anonymousDan•1h ago
Yeah there's a lot of hatred of Ryanair given their somewhat pugnacious attitude. But as far as I know they don't mess around when it comes to safety.
tyre•2h ago
Looks like they tried two attempts to land in Prestwick over two hours, then flew to Edinburgh and made one aborted landing, then finally went to Manchester.

What a nerve wracking experience for those pilots. I wonder if on the final attempt they knew they had to force it down no matter what.

simplicio•2h ago
Assuming it wasn't just luck, it seems impressive they managed to maximize their (landing attempts/fuel reserves) ratio like that.
searedsteak•2h ago
It is a requirement [1] to land with 45 minutes of fuel remaining, if the pilots go under that, it is considered an incident. As soon as estimated landing fuel goes under the limit, the flight needs to declare an emergency (as was done in this case).

[1]: https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F... is the US rule, EASA has a similar rule.

jacquesm•2h ago
Exactly. This will have a lot of consequences.
jacquesm•2h ago
They got within a hair of crashing, there is nothing impressive about this. 30 minutes, ok, you still get written up but this is cutting it way too fine.
maccard•22m ago
> this is cutting it way too fine.

Either this is true, or this is why there’s a 45 minute reserve requirement. There were three failed landing attempts in two airports prior to the successful landing, and they spent almost as much time attempting to land as the scheduled flight took.

Seems like this was exactly the scenario it was designed for?

gosub100•2h ago
About 5 years ago before ATC recordings became mainstay on YouTube, there was an American pilot that declared an emergency at JFK and very firmly said "we are turning back and landing NOW. Get the aircraft OFF all runways".

He was low in fuel and also frustrated with Kennedy ATC because he declared "minimum fuel" earlier and was still getting vectored around. (I know "minimum fuel" is not an emergency and has a very precise meaning).

They must have been very close to running out. But it was a valuable lesson learned in speaking up before you get to that point.

Esophagus4•1h ago
I’m guessing that pilot had also been taught the lesson of Avianca 052, which crashed at JFK because the FO / captain did not explicitly declare a fuel emergency.

JFK ATC in particular has an enormous workload with many international flights, combined with direct, even conflictual at times, NY communication style. It puts the onus on the pilot for conveying the message to ATC, rather than ATC for extracting the message from the pilot.

khuey•1h ago
You might be thinking of https://www.youtube.com/watch?v=-sQuHnrJu1I

For comparison, this is what can happen when the pilots are not that assertive https://en.wikipedia.org/wiki/Avianca_Flight_052

traceroute66•1h ago
> But it was a valuable lesson learned in speaking up before you get to that point.

I'm not sure it was a lesson learned per-se because the captain was merely doing his job as fundamentally defined.

A captain has ultimate responsibility for the aircraft.

However there is a side question in relation to your post...

When you say "declared an emergency" in your post, the more interesting question would be whether it was actually formally declared by the captain (i.e. "MAYDAY") or whether the captain was merely "working with" ATC at a lower level, maybe "PAN" or maybe just informal "prioritised".

If the captain DID declare "MAYDAY" earlier in the timeframe then yes, Kennedy would have a lot to answer for if they were spending excessive time vectoring around.

But if the captain did not formally declare and then came back later and started bossing Kennedy around, that would be a different set of questions, focused on the captain.

vdqtp3•28m ago
In the US, we don't typically call Mayday/PanPan (despite it being both allowable and more correct). Pilots literally say "N777DS declaring an emergency. Engine out/Low fuel/Birdstrike". The effect is that all emergencies are Mayday.
moralestapia•2h ago
Context: because of bad weather.

But I'm truly surprised (in a bad way) people on the ground couldn't solve the situation earlier. The plane was in an emergency situation for hours, wtf.

Also, the airport density in the UK is high, they should have been diverted since before the first attempt, as it has happened to me and thousands of flights every single day around the world.

dehrmann•2h ago
Armchair quarterbacking it, but it was human error. They should have diverted sooner and been more aware of the weather.

Edit: there might also be part of Ryanair culture that contributed, but that's speculation.

jacquesm•1h ago
That's one conclusion. But don't rule out a lot of other things that may have been a factor, for instance, they may have had a batch of bad fuel, they may have had less fuel to start with than they thought they had (this happens, it shouldn't but it does happen), the fuel indicators may have been off (you only know for sure after touch down), there may have been a leak, an engine may have been burning more than it should have. There are probably many others that I can't think of of the top off my head but there are a lot of reasons why the margins are as large as they are.
dehrmann•1h ago
Those are all possibilities, but

https://www.flightaware.com/live/flight/RYR3418/history/2025...

They had at least an extra hour of fuel, and they landed at the third airport they tried.

jacquesm•1h ago
Yes, that's how it should be. Something went badly wrong here. The big question is what.
krisoft•1h ago
I read and agree with all those options being possible. Except the "they may have had a batch of bad fuel". How would that work in your thinking? I can imagine a bad batch of fuel leading to engine damage or flameout and many other things, but it is hard for me to imagine how a bad batch would lead to not enough fuel remaining in the tank.
jacquesm•1h ago
If you have more water in the fuel than you think you do (there always is some due to condensation in the tanks) then you might be able to reach your destination but you'll be burning more 'fuel' than your original estimate would have you believe because there is less power per unit weight of (contaminated) fuel.

This is fairly common in GA and there are cases where it has happened in scheduled flights as well. That's why fuel sampling is common practice.

krisoft•1h ago
Interesting. That makes sense. Thank you for the explanation!
jacquesm•45m ago
It's supposed to be an extremely low amount and the fuel pick-ups are placed such that it should never be a problem but there have been cases where water in the fuel caused problems, including at least one notorious crash where the cause was identified to be fuel contamination.
jacquesm•1h ago
The incident investigation will surely focus on exactly those things. But: just like shipping aviation is at the mercy of the weather and even though the rules (which are written in plenty of blood) try to anticipate all of the ways in which things go wrong there is a line beyond which you are at risk. I've had one triple go-around in my life and it soured me on flying for a long time afterwards because I have written software to compute the amount of fuel required for a flight and I know how thin the margins are once you fail that third time. I am not going to get ahead of the investigation and speculate but I can think of at least five ways in which this could have happened, and I'm mostly curious about whether the root cause is one of those five or something completely different. Note that until there is weight on the wheels you don't actually know how much fuel remains in the tanks, there always is some uncertainty, to the pilots it may well have looked as if the tanks were already empty while they were still flying the plane. Those people must have been extremely stressed out on that final attempt to land.
volkl48•1h ago
Per the FlightRadar24 logs, it looks like only about 45min was wasted over Prestwick, not 2hrs. First approach was around 18:06, and they're breaking off to head for Edinburgh by about 18:51.

If there's considered to be a mistake here though, I'm guessing it's going to be spending too long before committing to the initial diversion.

Without knowing the weather they were seeing at the time, seems hard to say if they should have gone for a closer 2nd alternate than Manchester.

bell-cot•2h ago
> The pilots had been taking passengers from Pisa in Italy to Prestwick in Scotland on Friday evening, but wind speeds of up to 100mph meant they were unable to land.

> After three failed attempts to touch down, the pilots of Ryanair flight FR3418 issued a mayday emergency call and raced to Manchester, where the weather was calmer.

#1 - if Prestwick had wind speeds up to 100mph, then why the h*ll was the airport not closed down?

#2 - if the pilots had experienced conditions that dire during their first two landing attempts at Prestwick, then why the h*ll did they stick around for a third attempt?

EDIT: The article's a big vague, but it seems to have been 2 attempts at Prestwick, then 1 at Edinburgh, then the last-minute "oops, do I really want to die today?" decision to run to Manchester.

Quillbert182•2h ago
Looks like the third attempt was actually in Edinburgh
closewith•2h ago
The third attempted landing was in their diversion airport, Edinburgh, not a third at Prestwick.
TulliusCicero•2h ago
The third attempt was in Edinburgh, looks like.
sleepyguy•2h ago
The plane landed with approx 67 gallons of fuel. They typically land with 670 gallons.

A US gallon of Kerosene weights approx 6.5 lbs

jacquesm•2h ago
That is very exceptional. I've written fuel estimation software for airliners (cargo, fortunately), and the number of rules regarding go-arounds, alternates and holding time resulted in there usually being quite a bit of fuel in the tanks on landing, by design. I've never heard of '6 minutes left' in practice where it wasn't a massive issue and the investigation into how this could have happened will make for interesting reading. A couple of notes: the wind and the time spent on the three go-arounds + what was necessary to get to the alternate may not be the whole story here, that's actually factored in before you even take off.

I'd be very wary to get ahead of the investigation and make speculative statements on how this could have happened, the one thing that I know for sure is that it shouldn't have happened, no matter what.

psunavy03•1h ago
And the reason why those fuel reserves exist is to be a guard band allowing situations like this to happen without flames, wreckage, and death.

Having worked with many US airline pilots over the years, this is also why they are so proud to be unionized. Sure, senior pilots make as much as some FAANG developers, but the union is also there so that management doesn't get bright ideas about things like cutting fuel reserves to cut costs without the union telling them to stuff it.

jacquesm•1h ago
Management can't cut fuel reserves, not because the pilots are unionized but because there are some very strict rules about these fuel estimations prior to take off and margins be damned. And those rules are exactly there because otherwise this kind of incident would happen far more frequently. But it's regulation that is the backstop here, not the pilots.
psunavy03•1h ago
The point is that the unions are there to allow the pilots to advocate for all kinds of safety-of-flight related things like fuel reserves, crew rest, and so forth that management would be happy to cut to save money. And to do so without fear of retaliation.

And if you don't think the airlines would love to lobby Congress about the regulatory backstop, well . . .

jacquesm•56m ago
As I wrote elsewhere in this thread I actually wrote software to estimate the amount of fuel a jet should load to comply with the rules. This was commissioned by the airline and they were scared shitless that they would ever be found to be in breach of the regulations on this aspect. It is one of those red lines that you really do not wish to cross. There are other aspects of flight where you are right but this particular one is different.

The main reason why airlines would like to take the least amount of fuel is because it immediately increases payload capacity and thus flight efficiency. This being a cut-throat market there is a serious incentive to cut it as fine as possible. So the regulations around this particular issue are incredibly strict: you have to have a certain amount of fuel left upon landing, you have to write up truthfully how much you still had left and you will be investigated without fail if you cut into the reserve. The good thing about unions here is that they help to make sure that pilots know they are safe reporting truthfully because the airlines can not retaliate if they would pressure the pilot to not report an incident (which all pilots would normally definitely do). So they're a factor, but it is the regulator that writes the rules here and they are super strict about this.

And that's immediately why the calculation of the estimate becomes so important: you now have 30 minutes (or 45, depending) of deadweight + the deadweight for two alternates and an x amount of time in a holding pattern, plus up to three go-arounds. That really adds up, so you have to do your best to get the calculation as close as possible to what it will be in practice without ever cutting into that reserve.

It took me the better part of a year and massive amount of learning to write a small amount of code + associated tests to pass certification. It also taught me more about software engineering (as opposed to development) than anything I did up to that point in time and it made me very wary about our normal software development practices.

jjk7•55m ago
I think the literal fear of death _might_ be motivation enough for pilots to advocate for safety? And if they want to fire you, would you want to work for them anyways?
immibis•37m ago
The alternative to employment is death. Many people are willing to take a possible chance of dying to avert a certainty of dying.
12_throw_away•26m ago
> I think the literal fear of death _might_ be motivation enough for pilots to advocate for safety?

You'd think, but individual humans are very very bad at estimating risk, and in toxic group and work situations, humans will often assume increased risk rather than risk conflict ... especially if their paycheck is involved. Fear of death is not nearly as powerful as robust regulation and unions.

oivey•6m ago
Famously, this fact is also why no one drives recklessly and no one has lost any limbs with power tools.
jMyles•1h ago
...that regulation is text in a database. It can be changed capriciously at any moment, like they often are.

It takes people with ideas and a willingness to put pressure in the right places to be sure that sane policies prevail.

I think it's pretty obvious that as time moves forward, we need to rely on "regulations" less. The root and history of the word in the political context is to make things regular. But state actions increasingly bring irregularity to the world.

It seems absolutely fair to say that, in this situation, the people - the pilots in particular, but also cabin crews, ATCs, engineers, and their unions, are the backstop worth observing and celebrating.

jacquesm•1h ago
If you land with less fuel than the legal minimum you are going to have a lot of explaining to do, there will be an investigation and you, the pilot and the airline will get enough headache from it that you will make bloody sure it does not happen again. The pilot(s) may not be able to fly until that investigation has run its course, the airline may get fined or warned if this is the first time it happened. In an extreme case the pilots may lose their license.

> It seems absolutely fair to say that, in this situation, the people - the pilots in particular, but also cabin crews, ATCs, engineers, and their unions, are the backstop worth observing and celebrating.

I will hold off on that conclusion until the report is in. There are so many possible root causes here that speculation is completely useless, and celebrations would be premature.

jMyles•1h ago
My apologies - I didn't mean to speculate about this incident in particular, but about the general role of so-called "regulation"; I thought it was unfair to minimize the role of the people and unions compared to the (in my view, comparatively flimsy) legislation.
rcxdude•5m ago
I think the thing that's being pointed out as overlooked when praising the employees and the unions, is the regulators, who are the people who play a very large part in making sure that the regulations are enforced. The regulations are just text in a database, but it's the regulators who actually make it happen.
yodelshady•47m ago
Regulations are paper. Who enforces the behaviour, of whether to take off or not, on a windy night in central Italy?

Of course the pilots are the backstop, and the unions are theirs, so they can make necessary calls the money doesn't like.

parineum•1h ago
> Sure, senior pilots make as much as some FAANG developers

That's a funny way to phrase it. I'd probably go the other way and say "sure, FAANG developers make as much as some pilots..."

Those pilots have hundreds of lives on the line every day.

kroolik•1h ago
Those FAANG devs have milions of (social) lives on the line, though. Every day.
kpmcc•1h ago
Is this a joke?
jacquesm•54m ago
Yes. I think the average bus and train driver is completely underappreciated as well and they have a massive responsibility too. I know I could not do their jobs, it would weigh on me too much.
abtinf•1h ago
Naively as an outsider, this situation seems like everything worked as intended?

On a nominally 2h45m flight, they spent an extra 2 hours in the air, presumably doing doing fuel intensive altitude changing maneuvers, and were eventually able to land safely with their reserves almost exhausted.

I’m a little confused by what there is to investigate at all.

How much fuel should they have landed with?

GLdRH•1h ago
30min+
jacquesm•1h ago
Yes, I believe this is correct for this model aircraft.
fabian2k•1h ago
My understanding is that they shouldn't have spent that much time in the air (not intended as a guess for the cause). The margin is there for situations where you can't land earlier, not the margin for scheduling the landing. There is margin for expected potential delays, they were in the other margin that should never be used except in true emergencies.
abtinf•1h ago
Oh I think I see; so is the question not “why did they land with so little fuel”, but more like “why did it take so long to decide to redirect to a known-safe airport”?
fabian2k•1h ago
I don't know. As the parent said, I'd be careful with guessing the root cause right now. They should not have been this low even if diverted due to weather.
jacquesm•1h ago
Possibly. Or 'why did your fuel readings deviate from what was actually in the tanks' or 'why did we leave with less fuel than we thought we did' and so on. There are so many variables here speculation is completely pointless. All we know is that something went wrong, that it almost led to a crash and that it involves an airline with a very good record when it comes to things like this.

Low fuel happens, but this is (very) exceptional.

wahnfrieden•1h ago
By asking such a question you understand the need for an investigation
zerkten•1h ago
If they have to touch and go, how long would it take until they get the plane around for another approach? In fact, you might not get as far as that touch and go and have to go around. You need some margin for all of these eventualities. The likelihood is low that these happen, but they have to be accounted for.
bluGill•1h ago
Sure, but the flight was a lot longer than planed. How much extra do we need. They declared an emergency, and thus put themselves at the front of the line. They had 6 more minutes to do that touch and go around if that happened, and since they were already in a low fuel emergency they get priority and so there is enough time to do that if they needed. (edit - as others have noted, 6 minutes with high error bars, so they could have only had 30 seconds left which is not enough)

They landed safely, that is what is important. There is great cost to have extra fuel on board, you need enough, but it doesn't look to me like more was needed. Unless an investigation determines that this emergency would happen often on that route - even then it seems like they should have been told to land in France or someplace long before they got to their intended destination to discover landing was impossible.

jacquesm•1h ago
> They had 6 more minutes to do that touch and go around if that happened

6 minutes is way out of the comfort zone. They might not have made it in that case.

scrumper•55m ago
Correct, article says they landed with 220kg which is around 6 minutes of average fuel burn over an entire flight - bit less at cruise, a hell of a lot more at takeoff/climb.

So I don't think 220kg is enough to do a go-around in a 737 (well, a go-around would've been initiated with a bit more than 220kg in the tank - they burned some taxing to the gate - but you get my point.) I've read around 2,300kg for takeoff and climb on a normal flight in a 737-8. A go-around is going to use close to that, it's a full power takeoff but a much shorter climb phase up to whatever procedure is set for the airport and then what ATC tells you.

I just flew 172s but even with those little things we were told, your reserve is never to be used.

These people came very, very close to a disaster. Fortunately they had as much luck left as they did fuel.

whycome•19m ago
> I've read around 2,300kg for takeoff and climb on a normal flight in a 737-8.

ChatGPT suggests way lower numbers for take off / climb in a 737-8.

600-1000kg from brake to reaching cruise.

bluGill•43m ago
I agree, well out of comfort zones. However to my reading multiple different things went wrong to get to this point.
jacquesm•42m ago
That could be. We just don't know right now, but your intuition may well be correct, even if there is a single root cause there could very well be multiple contributory causes.
behringer•1h ago
With 6 minutes left everyone could have died if anything went wrong with the final landing, even a gust of wind could have ended everybody's life.
bluGill•41m ago
Could have, but pilots practice no fuel landings all the time (in simulators). If they can get to ground that is "level enough" nobody dies. It is not something you ever want to see in the real world (and in the real world people often do die when it happens), but it isn't automating people die.
ktallett•1h ago
Surely the issue is more that they decided to make so many attempts to land local. There should be a max level of attempts.
jacquesm•1h ago
There is a lot of pressure on pilots to land local. But 3 go-arounds happens, not often, but it does.
ktallett•34m ago
Perhaps that decision needs to be removed from the airline and there needs to be an independent decision maker there.
gregoriol•1h ago
Flight from Edinburgh to Manchester is just a bit more than 1 hour, so after trying 2 landings, diverting to Edinburgh (15-20 minutes flight), 1 more landing attempt, well, you get very close to 2 hours.
gsnedders•1h ago
I felt like that seems a little long from EDI to MAN (after all, EDI to LHR is typically a flight time of under an hour!), so:

https://globe.adsbexchange.com/?icao=4d2256&lat=54.720&lon=-... is the track of this flight.

Went around at EDI at about 19:10Z, landed at about 19:51Z, so about a 41 minute flight.

paulddraper•1h ago
At what point should they investigate?

0 minutes?

-1 minutes?

jacquesm•1h ago
Anything less than 60 minutes would be looked at by the airline, anything less than the legally required amount (30 minutes for a jet of this type iirc) will result in a very serious investigation. Note that for slower aircraft (for instance a turbo-prop) the time requirement goes up not down because they may have to spend more time in the air to reach an alternate (or secondary alternate, if things are really bad, like what happened here).
metalman•1h ago
6 min, is empty, 6 min is purely theoretical, 6 min would not clear for ground handling or a test start, or a fuel system check,6 min would not do a go around. will interesting to see if they release info about what the real amount of fuel left is, and an authorative discussion on how much useable flight time was there. did they actualy make the taxi to the terminal?, or run out on the apron?
jacquesm•1h ago
Yes. There is another comment above making light of the 6 minutes as if another go-around was still an option, that is a ridiculous take. They were going to bring that plane in and land it no matter what on this last run, otherwise they'd crash for sure. 6 minutes may not even be within the margin of readout.
scrumper•48m ago
I think the article says that someone saw 220kg written on a log - that's about 6 minutes worth at cruise. So yeah, it's zero basically.
gsnedders•1h ago
As others have said, final fuel reserves are typically at least half an hour, and you shouldn't really be cutting into them. What if their first approach into MAN had led to another go around?

With a major storm heading north-easterly across the UK, the planning should have reasonably foreseen that an airport 56 miles east may also be unavailable, and should've further diverted prior to that point.

They likely used the majority of their final fuel reserve on the secondary diversion from EDI to MAN, presumably having planned to land at their alternate (EDI) around the time they reached the final fuel reserve.

Any CAA report into this, if there is one produced, is going to be interesting, because there's multiple people having made multiple decisions that led to this.

jacquesm•1h ago
Just reaching altitude again to make it to the first and later second alternate are mostly likely the biggest factors in the extra fuel consumption. That's very expensive.
dTal•1h ago
You get that energy back on descent, no?
bagels•1h ago
Some of it, but much is lost to drag. They do have to limit speed at all times.
tamcap•1h ago
Not really. While you have a large potential energy buildup at a higher altitude, you cannot "bank it" / "save it" on descent. There is no way to store it in batteries or convert it back into fuel.

One of the challenges of aeronautics is the efficient disposition of the potential energy without converting it all into kinetic energy (ie speed) so that the landing happens at an optimally low speed - thus giving you a chance to brake and slow down at the end.

epcoa•1h ago
How? On descent you can trade some of your altitude (potential energy) for kinetic energy, but then you can’t land the plane. For descent on an approach you’re going from low energy to even lower energy. In emergencies and with enough runway you can futz around with this some, but wiggle room on an airliner is not great, negligible to what will be expended on a go around.
recursive•1h ago
As someone who has ridden a bike up a big hill, and then down it, I don't think you get it back.
robotresearcher•47m ago
No, and you don't want it. You want to be on the ground and stopped. In the lowest energy state.

It's not currently feasible to harvest it into fuel. It's (very very nearly) all lost to drag, on purpose.

MaxikCZ•37m ago
4 replies and 3 are dismissing even the idea..

Yes, you get "some" back, and its not negligible amount. Typical modern airliner can descend on 15-20:1, giving you over 150-200km (90-120mi) range from typical cruising altitude of 33 000 feet even with engines off. Most everyday descents are actually done by maintaining altitude as long as possible, and then iddling the engines fully for as long as clearance allows. (Ofc you then use engines as you geat nearer, because its safer to be a little low when stabilizing on approach, than a little high)

Thanks to turbofans better efficiency + less drag at higher altitude its actually more fuel economical to command full thrust and gain altitude quickly, than slower climb, or maintaining altitude (which goes against our intuition from cars, where if you wanna get far, you never give full throttle).

But theres still some drag, so you dont get everything back, so you generally want to avoid murking in low altitudes as long as possible. Full thrust repeatedly at lowest altitudes (from failed go arounds) is the least economical part of flight, so you want to avoid those if possible. But its true that the altitude you gain is equivalent to "banking" the energy, just not all of it.

jacquesm•34m ago
(1) this was a jet, not a turbofan

(2) fuel burned stays burned, you don't 'get it back'

(3) the altitude gained may have been adjusted to account for the low fuel situation

(4) the winds are a major factor here, far larger than the fact that 'what goes up must come down', something that is already taken into account when computing the fuel reserve in the first place.

FireBeyond•27m ago
1 - a turbofan is a subset of jet engine, and there are no 738s running anything other than a turbofan.

Actually, nothing in civil aviation that has a "jet engine" has used anything but a turbofan (or turboprop) since the early 70s with the exception of Concorde and some older business jets.

(Turboprops are jet engines, too, to be precise, with the jet of exhaust gases powering the propeller.)

connorlu•24m ago
The 737-800 uses CFM56-7 turbofan engines.

[1] https://en.wikipedia.org/wiki/CFM_International_CFM56#CFM56-...

alwa•20m ago
(1) The turbofan category of jet engine seems to inspire a lot of very pretty animated technical diagrams—here’s one set from a German manufacturer [0]. Now if only we could convince Bartozs Ciechanowski to take on such a subject… [1]

(2) I know glider pilots who fly without any fuel at all, once aloft… sounds not unlike the 150-200km glide range that @MaxikCZ mentions at idle from cruising altitude.

[0] https://aeroreport.de/en/good-to-know/how-does-a-turbofan-en...

[1] e.g. https://ciechanow.ski/airfoil/

mrguyorama•19m ago
Some of it. The air density is an important part of efficiency at higher altitudes, so every moment spent under like FL320 is wasted fuel.

So the entire climb "up", you are also wasting energy fighting the thick air. On the way back "down", that air again fights you, even though you are basically at idle thrust.

Your fuel reserves are calculated for cruise flight, so time spent doing low altitude flying is already at a disadvantage. "Two hours of reserves" is significantly less than that spent holding at a few thousand feet. Fuel efficiency while climbing is yet again dramatically worse

cpncrunch•1h ago
The 30 min reserve is on top of the fuel needed to reach the alternate and do a landing there, so only the flight to the second alternate, plus the 2nd and 3rd landings at the initial destination would have cut into the reserve.
nostrademons•1h ago
With 100mph winds I could easily see the 30 min reserve being eaten up by the flight from Edinburgh to Manchester. It's 178 miles! It takes a good 15-20 minutes to cross that distance when flying normally, add ascent & descent time and the landing pattern and you're easily at 24 minutes.

Edit: in other comments here, it seems like Edinburgh to Manchester is a 45 minute flight. So yeah, they could easily have been outside of reserves when they did the go-around at Edinburgh and still had only 6 minutes left at Manchester.

MBCook•27m ago
I thought a lot of airlines had rules to limit the number of attempts you could make at a single airfield in an attempt to prevent this exact kind of situation.

It sounds to me like they tried harder at their intended destination than maybe they should have, followed by going to an alternate airport that probably wasn’t a good choice in the first place, and then having to divert to the final airport where luckily they could land in time.

loverofhumanz•1h ago
"I’m a little confused by what there is to investigate at all."

You're confused why they should investigate how everyone on that flight came within minutes of dying?

Something about the fuel reserves, procedures, or execution was clearly flawed.

nickff•1h ago
Fuel depletion is risky, but not that risky; see the Gimli Glider for a case much more dangerous than this, which still worked out amazingly well.

Edit: Here is the Wiki on incidents... https://en.wikipedia.org/wiki/Fuel_starvation_and_fuel_exhau...

loverofhumanz•1h ago
Depends largely on the altitude when fuel runs out. If it runs out when they're at 4,000 ft and it's windy, it's probably game over.
behringer•1h ago
And what happens if you're not at 40k feet when the fuel runs out?
nickff•33m ago
Good thing that airliners spend so much time at altitude!
MBCook•27m ago
Especially while making landing attempts?
5f3cfa1a•1h ago
Fuel depletion is _not that risky_ is an interesting take. But hey, it won Chapecoense its first and only Copa Sudamericana, so maybe it isn't that bad after all?

https://en.wikipedia.org/wiki/LaMia_Flight_2933

jacquesm•1h ago
Fuel depletion is stupendously risky, it is one of the most risky things that can happen to a jet. The only things more dangerous are fire and control systems failure.

The Gimli Glider was a case of many items of luck lining up.

troupo•1h ago
You could've read at least the Wikipedia page on how miraculous Gimli Glider was.

From "all engine failure is never expected and not covered in training" to "Pearson was an experienced glider pilot familiar with techniques rarely needed in commercial flights" to the amount of maneuvers they had to execute on a barely responding aircraft

jacquesm•43m ago
Exactly, the takeaway from that saga is that extreme luck does happen, not that flying without fuel is perfectly safe.
nickff•34m ago
They also happened to know about an old airport which was no longer active, but did not know about the concrete barrier in the middle.
gmanley•1h ago
That example is so well known due to how exceptional it was, especially how the pilots handled it. Robert Pearson, the captain, was a very experienced glider pilot. That's something that not most pilots have.

There were also two factors in the landing, that allowed for this to happen. You're going to be coming in really fast for a landing, when gliding in a commercial jet, and you don't have access to your reverse thrusters to slow it down. There was a repurposed runway, that they used to land, that just happened to have been used as a drag racing track and had a guard rail. They were able to slow down by scraping across that. It also just so happened the nose gear didn't deploy fully so scraping the nose of the plane against the ground also helped slow it down.

Needless to say it was a bunch of very fortunate events that allowed it to not end in disaster. In any case I would consider it very risky.

dreamcompiler•32m ago
And even with all that scraping damage they were able to fly the plane out, repair it, and put it back in service. Amazing.
cibyr•22m ago
The "scraping helped slow it down" theory makes no sense to me. What do you think has a higher coefficient of friction - tire rubber on asphalt, metal on asphalt, or metal on metal?
smaudet•7m ago
Don't forget the surface area of contact...

Rubber likely grips much better than metal, however three wheels have massively lower surface area than the body of the plane, or even a small section of it like the head.

Of course we don't land tireless for other reasons (metal transfers heat exceptionally well unlike rubber, paint doesn't survive high speed impact, and it tends to deform upon impact with anything, making any future flights unsafe), but the fastest way to slow down if you don't care about safety or comfort would probably be to land tireless, if you could introduce some rotational spin, that might be faster (more force directed in multiple directions).

gmanley•7m ago
I would hesitate to chalk it up to just theory, given it was in the NTSB report and they don't really mess around with throwing baseless stuff around.

You also have to keep in mind, it wasn't just rubber against asphalt, it was rubber on wheel that spins. I'm not sure if the front nose gear on a 767 has any brakes but even if it did, I can't imagine it would be sufficient at the speeds they were going.

cosmicgadget•17m ago
Although credit is due to fuel reserve policies considering they landed after two diversions and three go arounds.
kube-system•1h ago
I'm not an aviation expert, but generally in safety engineering, safety buffers are not simply calculated as [normal situation] * [safety factor], but [worst case scenario] * [safety factor]

If you ever cut into your safety allowance, you've already fucked up. Your expected design criteria should account for all use cases, nominal or worst-case. The safety factor is there for safety, it is never intended to be used.

jacquesm•1h ago
This is exactly how it is in this case. Any consumption of the fuel reserve would result in an investigation, this is a very extreme case and it may even result in a change in the rules depending on the root cause.
constantcrying•1h ago
>I’m a little confused by what there is to investigate at all.

One of the most important aspects of taking safety seriously is that you do not just investigate things which had an impact, but that you proactively investigate near misses (as was the case here) and even potential incidents.

A plane with 6 minutes of fuel left is always a risk to every person on board and potentially others if an emergency landing becomes the only option.

MadnessASAP•18m ago
Indeed that is the definition of a "aviation incident" where there was a risk of injury or damage. If there is actual injury or damage it becomes an "accident".

The investigations into incidents aren't usually particularly long or noteworthy and often the corrective action will be to brief X on dangers of Y, or some manner of bulletin distributed to operators.

Ekaros•1h ago
Only issue I see is that should there have been stricter rules to diverting way earlier. If winds were such as to make landing harder. Would just directly going somewhere else been the correct choice to force.
jacquesm•1h ago
This is likely one of the questions the investigation will focus on.
MBCook•25m ago
It also sounds like they went to an alternate airport they probably shouldn’t have bothered with.
immibis•39m ago
Whether it can be prevented in the future. Should planes fly with even more reserve fuel? It's possible. Or maybe different ways of selecting alternate landing sites?

It may even be the answer is "no, everything went as well as it possibly could have, and adding more reserve fuel to every flight would be unacceptably wasteful, so oh well", but at a minimum they'll probably recommend even more fuel on certain flights into risky weather.

jakub_g•1h ago
How many go-arounds and alternates are usually accounted for? Assuming EU, high-airport density etc, typical 2h flight.

Does the estimation change depending on weather forecast, season of the year etc?

jacquesm•1h ago
3 go arounds + 2 hours in a holding pattern should result in at least 45 to 60 minutes left in the tanks after landing. Depending on the kind of aircraft that can be a pretty impressive amount of fuel.

> Does the estimation change depending on weather forecast, season of the year etc?

Yes. There are many factors that go into this including trade winds (which vary quite a bit seasonally and which can make a huge difference), time of day, altitude of the various legs, route flown, weather, distance to alternates, altitude of the place of departure and altitude of the place where you are landing, weight of the aircraft, engine type, engine hours since last overhaul, weight of passengers, luggage and cargo, angle-of-attack and so on. The software I wrote was a couple of thousand lines just to output a single number and 10x as much code for tests, and it was just one module in a much larger pre-flight application.

jakub_g•1h ago
I can only imagine how the test suite looks like. Wild.

This made me think about the fuel itself: is aviation fuel globally standardised and the same quality in every single airport in the world?

jacquesm•50m ago
The test suite was much larger than the code. It took ages to get it certified, the calculations had to be correct to the last significant digit to prove that the algorithms had been implemented correctly. This caused a bit of a headache because the floating point library that I used turned out to be slightly different than the one from the benchmark.

There are three different kinds of jet fuel and all are produced to strict standards, and then there are allowances for ppm water contamination (very low, to ensure the fuel system will never freeze at altitude or in freezing weather on the ground or at lower altitude).

YeahThisIsMe•1h ago
I remember this stuff being a bigger story for a short moment x years ago, where low cost carriers (it might have been Ryanair then, too) routinely flew with unreasonably small amounts of "backup" fuel and had to declare emergencies in order to get on the ground safely.

I guess they're trying it again now that the whole thing had blown over.

cosmicgadget•12m ago
Pretty obviously not the case here if you read the article.
coolThingsFirst•1h ago
const estimateFuel = (distanceInKms, litersPerKm) => distanceInKms * litersPerKm;
BenjiWiebe•54m ago
I don't even know what I'm talking about, but you at least forgot to account for headwinds and differing drag amounts at different altitudes/speeds.
jacquesm•50m ago
The big one is the trade winds. Those can really kill your efficiency on long distance flights.
coolThingsFirst•42m ago
Yes it was a bit of humor, sad it didn’t land.
fidotron•1h ago
I have known former air traffic controllers that won't fly certain airlines because of a notorious habit some have for queue jumping by claiming they're low on fuel. If they are low on fuel is something else, but in any case when the ATCs have noticed a pattern then something is up.

This situation sounds a lot less nefarious, but it does also sound like they should have rerouted earlier.

kpmcc•1h ago
Which airlines? I feel like if this is an issue we should be naming names.
estebank•1h ago
RyanAir is famously one of them.

Edit: I was recalling articles claiming the company purposely fueling less than other airlines in order to increase their rate of claims for priority landing to have a better "on time" statistics.

This forum post disputes that: https://aviation.stackexchange.com/questions/38501/is-it-tru...

fidotron•1h ago
No way.

Having attended meetings at ICAO I can also tell you many details of various aviation incidents, including their existence, are covered by some secret classification. This fact being disclosed caused most of the attendees to lose all hope in the rest of the proceedings. To their credit the FAA reps on that occasion were by far the most reasonable gov representatives in the room, and the FAA are one of the major voices pushing for greater transparency on it.

nradov•1h ago
Which specific civil aviation incidents are covered by some secret classification?
SJC_Hacker•48m ago
> Which specific civil aviation incidents are covered by some secret classification?

You would have to have secret clearance to know which ones

nradov•21m ago
It's cool, I have Top Secret Level 3 (Omega Sector) clearance so you can go ahead and tell me.
alwa•24m ago
It’s generous of the classifying authority to send to the ICAO meeting somebody both appropriately credentialed to know about the information in question, and willing to talk coyly about it. Did these additional incidents inform the policy discussions at the meetings you attended?
fidotron•22m ago
It's funny you say that, because the way it happened was it was blurted out by a diplomat from a certain country, at which point most of the regulators facepalmed and all of those of us from outside were having the same reaction as many here.

The whole subject of discussion prior to this was efforts to improve data sharing wrt incidents.

jacquesm•1h ago
Claiming you're low when you are not is going to cause a major headache for the PIC, they're going to have to write that up and they may well be investigated. If it turns out they were lying they would likely find out that that is a career limiting move and if it happens too often then that too should result in consequences. The main reason is that your fake emergency may cause someone else to have a real one.
ashdksnndck•52m ago
What’s the mechanism for them to get caught?
jacquesm•45m ago
Random spot checks. Every day at every airport some of these will get verified. Also, the next pilot would have to be willing to cover for you because they are going to have to falsify their records to make your trick invisible. You record the amount of fuel in the tank when you take command of the aircraft, the amount of fuel that was loaded and from that it is trivial to compute how much was left the last time it landed.
refulgentis•40m ago
Lets say a plane crew claims low fuel.

The pilot in charge has to file a writeup.

When someone accepts the writeup, there's a random chance it's selected for followup. If/when they discover there was enough fuel, it will affect the career(s) of person(s) involved.

First, generally, people don't like having to do paperwork, and especially don't like doing paperwork to help you land a little quicker.

While one time may not be a fireable offense, you will find you career affected in the number of ways people can find to be uncooperative with you, or not support you when you attempt to advance your career within the company.

Developing a habit would lead your interlocutors to escalate the situation, which would lead to discipline up to and including the company firing person(s) involved.

mlyle•35m ago
When you declare a fuel emergency or even urgency, there's often follow up to figure out why (mechanical issue? problem with dispatch? problem with flying technique? exceptional weather condition that could be forecast better? etc). And there is plenty of data in aviation to know what happened.

Dispatch knows how much fuel they say they put in.

Your flight time, speeds, and profile are known.

ACARS may be reporting fuel use throughout the flight.

etc, etc, etc.

lenerdenator•1h ago
Kinda surprised there's no data link for that sort of telemetry so that you don't necessarily have to take the pilot's word for it.
jjk7•1h ago
Would that be more reliable than just ensuring there are consequences for lying?
lenerdenator•58m ago
Perhaps. If the pilot knows that the ATC can see he's full of it, he might be less likely to lie.

Those who still do can be grounded and be moved into management or take up a career in politics.

jacquesm•36m ago
As a rule airline pilots don't lie about this stuff. They take safety pretty seriously.
mrguyorama•32m ago
Putting a theory of "you shouldn't trust pilots" into ATC breaks the entire system.

It is a system built out of very regulated parts, very professional people, and tight controls.

Pilots are encouraged to be very forward and proactive about fuel situations because of https://en.wikipedia.org/wiki/Avianca_Flight_052

Minimum fuel requirements are calculated as "Time of fuel for cruise to certain points", which is usually good enough, but if an Airport is stupid busy, or has bad wind patterns, just a couple go-arounds will chew through your fuel way faster than the regulation expects.

Turbofan engines are also dramatically less efficient at low altitude than high altitude cruise. So holding at low altitudes because a congested airport is dealing with traffic will chew through your reserves much faster than you expect.

Ryanair flies short hops to congested airports. They will have relatively low reserves, and you should expect them to run into "Hey we are low on fuel" more often than international flights for example.

inglor_cz•16m ago
"It is a system built out of very regulated parts, very professional people, and tight controls."

Locally, this is true. Globally, not so much. I remember my friend's vivid description of a flight taken in Nepal. It was absolutely wild.

whycome•30m ago
I’m surprised the “fuel on board” isn’t something communicated via transponder considering previous low fuel emergencies/crashes.
gus_massa•49m ago
I expect that they take the pilot's word in case of a rare situation [1] and then make the fill a ton of paparwork to try to solve the main cause and also discourage lies.

[1] In one case someone mixed imperial and metric unix, and instead of $something-kilograms, they put only $something-pounds of fuel.

kbolino•44m ago
This incident is known as the Gimli Glider and was actually due to multiple failures before the pound-kilogram issue (and the backdrop of Canada's then-recent metrication) even became relevant: https://en.wikipedia.org/wiki/Gimli_Glider
MadnessASAP•30m ago
Second guessing a pilot saying they have a problem is a really bad idea. ATC second guessing an emergency is a really bad idea. Making a pilot explain why they're actually low on fuel, despite whatever some computer is saying, instead of focusing on flying the plane is a really, really bad idea.

Also, that sort of telemetry does exist for most major airlines, however it goes via satellite to the airline not the ATC.

nostrademons•45m ago
Since there's a lot of confusion in the comments below I'm going to hijack one of the top comments to make a couple points clear from the article and FlightRadar24 data: [1]

They did reroute earlier. It was 2 failed attempts on Prestwick (Glasgow), 45 minutes in the landing pattern, then they diverted to Edinburgh (15 minute flight), a failed attempt at Edinburgh (~5-10 minutes), and then they diverted to Manchester (45 minute flight) and landed successfully there. Likely they hit their reserve just as the Edinburgh landing failed and decided to fly to Manchester, with clearer skies, rather than risk another failure in their reserve.

IMHO the only questionable pilot decision here is to divert to Edinburgh rather than Manchester immediately. But this is somewhat understandable: first of all, dropping the passengers off at Edinburgh (an hour drive from Glasgow) is significantly less costly and less inconvenient than dropping them at Manchester (an overnight bus ride). Second, if the Edinburgh landing had been successful they would not have eaten into their reserve and no investigation would've been needed. Third, the Monday-morning quarterbacking could've easily gone the other direction if they had diverted to Manchester ("Why did you choose an airport 178 miles away and risk eating into your fuel reserve when Edinburgh was right there?")

[1] https://www.flightradar24.com/data/flights/fr3418#3c7f91f4

dboreham•34m ago
Quick note that Preswick is not really Glasgow (35 miles away) and Glasgow has its own airport which presumably was also affected by the same weather so they couldn't divert to that. Between the Scottish lowlands (where they had already tried all the commercial airports) and anywhere else, Manchester is about the closest option.
allturtles•30m ago
As someone totally ignorant of British airports, a Google maps search for "airports northern england" shows Teesside, Carlisle, and Newcastle all significantly closer to Edinburgh than Manchester. Are these not places where a 737 under emergency could land? Or was the weather also bad there?
nicoburns•6m ago
> Or was the weather also bad there?

That's likely, these places are not very far apart. And presumably if you have at most one landing attempt remaining you don't want to be taking any more chances.

inglor_cz•20m ago
"claiming they're low on fuel"

It is almost fascinating how humans will stoop to dishonesty even in banal situations - and not just any humans, but pilots, who should be subject to at least some vetting.

Maybe planes should be retrofitted as to transmit their actual fuel state including a qualified assessment in minutes to the ATC. Not just because of the cheaters, but also to warn the ATC in the rare case that some plane crew isn't very assertive about their dwindling fuel, or hasn't noticed the problem.

It would make prioritizing the queue a bit more neutral.

If I designed such a system from scratch, "remaining fuel" would be part of my telemetry.

geor9e•40m ago
Do forecasted storms go into the fuel estimate formulas?
mindslight•2h ago
Sounds like pilot error - they didn't pay the extra fee to have reserve fuel.
addandsubtract•34m ago
"Worth it" - Ryanair probably
deadbabe•1h ago
On the positive side, if they had made a crash landing with so little fuel, there would not likely have been a fiery explosion, and many more passengers would have survived than normal?
jacquesm•1h ago
Air + fuel explodes just fine. You really don't want to crash an airliner. At landing speed the number of people dead will still be > 0 and the remainder has a good chance of being injured seriously.

For instance:

https://en.wikipedia.org/wiki/Turkish_Airlines_Flight_1951

This happened at landing speed (the airport is only a few hundred meters from the crash site) and the plane was at the end of its flight from Turkey, it did not catch fire. Still, 9 people perished and the remainder were all but one injured 11 of them seriously.

deadbabe•44m ago
Only 7% died, pretty good for a plane of that size with a rough landing.
jacquesm•40m ago
Yes, even though that is a harsh conclusion to make and for the families involved of course it doesn't matter at all. But as these come this was bad but still not nearly as bad as it could have been. They were about to cross one of the busiest highways in NL, another 100 meters and it would have been an entirely different story. The field they landed in is in the Haarlemmermeerpolder, so clay and it had just been plowed.
eCa•21m ago
> and many more passengers would have survived than normal?

This[1] kind of crash landing is very rare (in that case there was no fire despite being immediately after take off, perhaps because of the cold). Normally an outcome like this is only reasonable to expect if you actually reach a runway despite being out of fuel. Like Gimli[2].

[1] https://en.wikipedia.org/wiki/Scandinavian_Airlines_System_F...

[2] https://en.wikipedia.org/wiki/Gimli_Glider

Molitor5901•1h ago
Possibly related, but not definite, this apparently has happened before with Ryan Air.

https://avherald.com/h?article=454af355

https://www.independent.co.uk/travel/news-and-advice/exclusi...

These were not definitive but it did raise concerns due to the budget nature of the airline.

AceyMan•1h ago
Under FAA rules this was a screwup. [edit: see my own reply] (However, the rules are subtle, so they can be partially forgiven.) However, I'm not only a dispatcher but also a philosophy BA, so I've found a good way to explain it.

Your reserve fuel (the "extra" fuel over what the actual flight burn) can of course be used (hello, that's what it's there for) but—and here's the rub—you can never plan on using it.

That is to say, in this case, when they missed their first or second approach, they CANNOT say, "We'll use our reserve fuel and make another go at it" because that would be intentionally planning to burn your reserve.

You may only dip into your reserve when you have no other choice. In this case, when the only fuel they had left was reserve, they are obligated by law to proceed to the alternate airport, which clearly they did not do [correction: they did do the proper thing; see my 2nd reply below]. No bueno.

[this is a slight simplification (minor details omitted for brevity) but the kernel of the issue is properly described]

crazygringo•1h ago
> That is to say, in this case, when they missed their first or second approach, they CANNOT say, "We'll use our reserve fuel and make another go at it" because that would be intentionally planning to burn your reserve.

Is that what happened? That's not in the article, what's the source?

And other comments here are saying the third attempt was in Edinburgh, so they were already trying to land anywhere possible by the third attempt.

At what point are you saying they chose to plan on using reserves when they still had any option for landing without reserves?

whycome•7m ago
OP didn’t have the full picture. They’ve offered appropriate edits/updates
AceyMan•1h ago
Update: OK, if *Edinburgh* was their alternate and they missed there and were then forced to bugout for Manchester, that's then an example of when reserve is OK to be burned. (The 'slight simplification' I omitted was unpacking how the alternate fuel plays into the process, but here, that was a key part of the series of events.) That's what I get for not reading TFA first :-/
behringer•1h ago
Not really, you should have enough fuel to make it to multiple alternatives or make emergency landing somewhere else. You should never burn that last 45 mins unless you want to make the news and file a lot of paperwork.
AceyMan•1h ago
I just had my paid-for LLM summarize the events.

The sequence was [depart Pisa => Prestwick (2 missed approaches) => proceed to Edinburgh (1 missed); declare Mayday fuel => proceed to Manchester (land on first attempt)]

scrumper•43m ago
I'm curious why you did that? It's not a very complicated sequence. The whole point of engaging in a discussion here is to think about the issues raised and offer a point of view while incorporating other perspectives into yours. You've spent your money to bypass the whole intent of this site; akin to you being hungry then sending someone else to a restaurant for you so you can later read their review of the food.

EDIT and you of most of the commenters here, with your industry background, are better placed to offer an opinion!

Hackbraten•34m ago
> It's not a very complicated sequence.

For me, it was. I have trouble forming a mental model of itineraries so I’m grateful for the summary.

whycome•13m ago
I think you missed the point.

Presenting information in different ways is useful (and the method of display can offer informational insights itself). And for different users it might help parse larger connections. And by using the LLM to summarize just that one facet of the problem (itinerary and sequence) and sharing it here, they’ve contributed in a meaningful way. It may not have warranted a response. But it added to overall understanding of the problem space to help facilitate discussion. And they did well enough by citing that the info came from an LLM. They didn’t bypass the intent of the site. They added to it and fell right in line with that intent.

ajkjk•41m ago
Don't post this at all next time
Hackbraten•35m ago
Thanks, I appreciate it!

Even though I’ve read the entire article, I found it very difficult to mentally visualize and ended up not noticing that there were three destination airports involved.

robthebrew•1h ago
I imagine the next step will be RyanAir asking passengers to carry fuel cans onto the plane. B*tards.
nomilk•1h ago
> One pilot who reviewed the log said: “Just imagine that whenever you land with less than 2T (2,000kg) of fuel left you start paying close attention to the situation. Less than 1.5T you are sweating. But (220kg) is as close to a fatal accident as possible.”
blizkreeg•1h ago
As a naive person, I have a simple question - why would they even fly to an airport where there's 100mph winds? Wouldn't ATC know this and tell the flight way in advance to fly to a different destination?
NoiseBert69•1h ago
Forecasts are based on multiple weather simulation runs.

It's a often good working gamble that you will pick a short period of weather that is within your operational limits.

Commercial pilots don't have "personal limits". It's defined by their airplane and/or companies constraints.

w10-1•1h ago
Can anyone say whether airline pilots make each diversion decision solely based on their own information and judgment, or do they loop in the company?
AceyMan•1h ago
Unless they are in an emergency and are busy with aviating, they will coordinate with their dispatcher on diverting, even if only to verify that the weather at the intended alternate is still favorable. Per the FAA regulations, the PIC and the dispatcher have joint operational control over the flight. Of course, at the end of the day, only the pilots have their hands on the controls, so they can make the plane do what they want—but from a legal standpoint, the dispatcher and pilot-in-command have equal & shared responsibility for the safe operation of the flight.
AceyMan•53m ago
I realize this is a UK carrier and was operating in the EU/UK, but for the most part, the rest of the world uses the US legal framework for aviation as a boilerplate for their own civil code. Yes, there are some differences, but these are usually minor and more of "differences in quantity" rather than "differences in kind". [Since the airplane was invented here the US had a head start on regulating civil aviation.]
chrisshroba•1h ago
For anyone interested, here is the flight playback:

https://fr24.com/data/flights/fr3418#3c7f91f4

kristofferR•1h ago
This very recent Mentour documentary is extremely relevant, came to mind immediately. Multiple redirects due to bad weather, extreme "Get-there-itis" and eventually running out of fuel.

Great edutainment if you're feeling in the mood for that. If you're inpatient you can skip to 14 minutes, before that is just back story.

https://www.youtube.com/watch?v=vK_7q9tixX4

rappatic•59m ago
> the Boeing 737-800 had just 220kg of fuel left in its tanks... enough for just five or six minutes of flying

Maybe I'm just unaware, but it's crazy to me that these planes burn 40 kilograms of jet fuel per minute.

dcchambers•28m ago
Especially crazy considering the 737 is not a particularly large commercial aircraft.

40kg/minute is around 12 gallons (47 liters) of fuel per minute. Meanwhile a 777 burns around 42 gallons (160 liters) per minute. A 747 burns 63 gallons (240 liters) per minute - more than a gallon per second!

throwaway-0001•58m ago
Better links

https://avherald.com/h?article=52dfe5d7&opt=0

https://www.reddit.com/r/aviation/comments/1nzet3a/flight_a_...

Quoted:

Incident: Malta Air B738 at Prestwick, Edinburgh and Manchester on Oct 3rd 2025, landed below minimum fuel By Simon Hradecky, created Sunday, Oct 5th 2025 14:39Z, last updated Friday, Oct 10th 2025 15:02Z

A Malta Air Boeing 737-800 on behalf of Ryanair, registration 9H-QBD performing flight FR-3418 from Pisa (Italy) to Prestwick,SC (UK), was on final approach to Prestwick's runway 20 when the crew went around due to weather. The aircraft entered a hold, then attempted a second approach to runway 20 about 30 minutes after the go around, but again needed to go around. The aircraft again entered a hold, about 10 minutes after entering the hold the crew decided to divert to Edinburgh,SC (UK) where the aircraft joined the final approach to runway 24 about one hour after the first go around but again went around. The aircraft subsequently diverted to Manchester,EN (UK) where the aircraft landed on runway 23R about 110 minutes after the first go around.

On Oct 5th 2025 The Aviation Herald received information that the aircraft landed below minimum fuel with just 220kg fuel (total, 100kg in left and 120 kg in right tank) remaining.

The aircraft returned to service about 13 hours after landing.

On Oct 10th 2025 the AAIB reported the occurrence was rated a serious incident and is being investigated.

A passenger reported after the first go around at Prestwick the crew announced, they would do another attempt to land at Prestwick, then divert to Manchester. Following the second go around the crew however announced they were now diverting to Edinburgh, only after the failed approach to Edinburgh the crew diverted to Manchester.

ro_bit•55m ago
> The Boeing 737-800 had just 220kg of fuel left in its tanks when it finally landed, according to a picture of what appears to be a handwritten technical log. Pilots who examined the picture said this would be enough for just five or six minutes of flying.

For reference, passenger airlines immediately declare emergency if their planned flight path would put them under 30 minutes of fuel (at least in the US). Landing with 5 minutes remaining of fuel is very atypical

dlcarrier•50m ago
The latest Captains Speaking podcast has an discussion about one of the hosts being in a similar situation: https://youtu.be/5ovlZ221tDQ

Fortunately, the flight left with extra fuel, because it was cheaper to carry excess from the origin airport than to buy it at the destination airport, so reserve fuel wasn't needed, but it was close. Also, there was lots of lightning.

schainks•48m ago
So this is about the stopping problem, but for airplane fuel, kinda?
m3kw9•44m ago
Another metric conversion error?
stockresearcher•29m ago
The only real question for the inquiry is how the decision was made to divert to Edinburgh and whether that was a reasonable decision at the time.
oncallthrow•14m ago
I look forward to watching this one on Mentour Pilot