back to article Ice in fuel caused Heathrow 777 crash

The Air Accidents Investigation Branch (AAIB) has concluded that the 17 January crash-landing of a Boeing 777 at Heathrow was probably caused by "ice within the fuel feed system" which restricted flow to the engines. BA038 (G-YMMM), after a routine flight from Beijing, suffered reduced thrust in both engines while coming into …

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G-YMMM (BA038 ) had been sumped at Heathrow

Aircraft was sumped on the previous day, hence the comment that there was not much water (5l in 100,000l of fuel).

Part of the wings broke, the main u/c legs are bolted to spars within the wing structure, and are designed to break off with minimal damage. In this case the soft earth applied stress in a way that prevented a clean break because the wheels gouged trenches rather than being able to rotate around their attachments.

Tanks were damaged on one side of the aircraft. About 6 or 7 tons of fuel escaped in total. The firemen were wading about in it just after the crash.

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"I haven't looked at the report": I. Approveofpostinggarbage

Anyone who *has* read the report will know that *you* didn't read it, the rubbish you posted makes that perfectly clear. Mind you, you're not alone in that respect.

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Boffin

@Brian Morrison

I'm duly corrected!

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Joke

Recipe for disaster

Take 300,000 parts jet fuel, a dash of dry vermouth, stir with ice and sieve into a cold fuel tank, add an olive to taste, for the perfect Mile-high Martini, mmm goes down smoooth (if slightly short)

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Paris Hilton

So @steve

So steve Boeing learnt a lot by closing the hearings and restricting it to the investigators only no reporters and whenever a curious reporter turned up they would name and address an we will send a complete technical report in the mail now go away we are busy.

This allowed legal to completely rewrite out all the bad bits and self incriminating evidence period before final public release .

The Comet investigation was complete thorough and very much out in the open at all times and information was released regularly .

This closed shop investigation gave out the odd snippet or tidbit , since the pilots were proclaimed heroes on day one , oh curses we can't blame them any more can we !

But then again the most dangerous time for any twin engine aircraft not far off stalling speed and low altitude under 1500 feet is asymetric thrust as any twin engine prop pilot will say on take off on full power when one engine suddenly fails at end of runway "We just bought the farm oh crap " as they have no more room to move due low speed sudden spin right or left and no altitude to trade for speed either .

Now since modern jets have both smart and dumb computer chips with both feed forward and feedback loops at the same time thus if one engine began to speed up but the second one says after you and then they both get in that loop and say to each other no you first then me vice versa and suddenly you have a live logic bomb go off if you have no loop limit instruction that says crap emergency firewall all engines now not later when both of you can't make up your mind as both are waiting for each other to spool up in a situation that will never happen hence just above idle speed thrust limit . Since the master electric switches and relays were activated to cut all power to everything due to ten tonnes of flammable Jet A sloshing around on the ground this would wipe the logic bomb off all the computers as after ten minutes they forget all register instructions held in the stack as the temorary memory is flushed from lack of power .

The other aspect is that most people regarding major aircraft incidents tend to remember the first rushed headlines and thereafter do not follow up unless spoon fed hence the goldfish memory syndrome which of course plays into the hands of those that seek cover up first of which Boeing is well versed in for decades since 1932 !

Choices ?

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Complete arse.

'Probably' cause it, in other words WE HAVE NO IDEA WHAT HAPPENED BUT FROM OUR INVESTIGATION OF THE TINY PIECES OF DEBRI WE FOUND WE CONCLUDE THAT ICE MUST HAVE BEEN THE CAUSE.

I hate air accident investigators, they're just educated guessers.

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