Computer failure most likely cause of 777 British Airways 38 accident
01-29-2008, 02:04 AM
#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.
01-29-2008, 10:17 PM
#23
Line Holder
Joined APC: Jul 2006
Posts: 27
01-30-2008, 01:11 AM
#24
Line Holder
Joined APC: Aug 2007
Position: BE-1900 CA
Posts: 72
Originally Posted by ryguy
On the 744 if we get low fuel temps we have to resolve the issue as quickly as possible. We can usually accomplish this by speeding up and/or descending.
01-30-2008, 01:34 AM
#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.
01-30-2008, 11:26 AM
#26
Gets Weekends Off
Joined APC: Mar 2006
Position: B777 FO
Posts: 416
Originally Posted by TangoBar
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?
Thread
Thread Starter
Forum
Replies
Last Post
Frisky Pilot
Regional
20
01-01-2022 05:02 PM
