Computer failure most likely cause of 777 British Airways 38 accident
#22
Gets Weekends Off
Joined APC: Mar 2006
Position: Contract purgatory
Posts: 701
Well, I was told flat put at an ALPA meeting tonight that my unlikely theory was way off and must have been fuel, something about the tanks being 80% water when they ruptured (pprune I gathered).
Sounded interesting enough and it gets the drivers off the hook, so I'm going with that.
Sounded interesting enough and it gets the drivers off the hook, so I'm going with that.
#23
#24
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Joined APC: Aug 2007
Position: BE-1900 CA
Posts: 72
I'm curious- does this work because speeding up causes enough additional friction heating of the wing to keep the fuel/contaminants from gelling? Or is it just speeding up in the process of descending?
#25
Gets Weekends Off
Joined APC: Mar 2006
Position: Contract purgatory
Posts: 701
Friction heating is correct my good man. Technically you are increasing TAT (total air temperature).
Descending would not increase your speed, necessarily. Actually, you would decrease Mach #, usually, by descending. Not that that really has anything to do with, well, anything. These thing's don't change pitch angle much at all when climbing or descending, in fact the 777 mostly increases power for a cruise climb (opposite for a descent), and doesn't deviate too much off of 2 1/2 degrees.
Normally one would decrease altitude to increase air temperature, so the two thing's are unrelated other than they have the same effect on the fuel temperature.
Likely there is someone here who can offer a really good technical answer, but that's just the basics of it from my view point.
Descending would not increase your speed, necessarily. Actually, you would decrease Mach #, usually, by descending. Not that that really has anything to do with, well, anything. These thing's don't change pitch angle much at all when climbing or descending, in fact the 777 mostly increases power for a cruise climb (opposite for a descent), and doesn't deviate too much off of 2 1/2 degrees.
Normally one would decrease altitude to increase air temperature, so the two thing's are unrelated other than they have the same effect on the fuel temperature.
Likely there is someone here who can offer a really good technical answer, but that's just the basics of it from my view point.
#26
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01-01-2022 05:02 PM