Very cold fuel A320F
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Very cold fuel A320F
The procedure for dealing with very cold fuel in the A320F is either to increase mach, descend or a combination of both. I was wondering how long it takes to get the fluid to warm up after completing these actions, and how much of an altitude change would be required. Temperature over Labrador -Greenland last night was -68c and the aircraft had been fuelled with Jet A at a very cold US airport.
4,000’ lower alt will increase the TAT by 7 degrees, and an increase of 0.01 Mach will increase TAT by 0.7 degrees.
I don’t know how long the tanks would take to warm up by this amount though.
I have only once had the -47 degree indication, over Greenland, where the SAT was -72 What temp did your fuel get down to?
I don’t know how long the tanks would take to warm up by this amount though.
I have only once had the -47 degree indication, over Greenland, where the SAT was -72 What temp did your fuel get down to?
Can’t speak for the northern parts but in the winter in the 70s southern latitudes you might need to get below FL300 to get the warmer air as the tropopause is so low.
Only half a speed-brake
Tried -2000 ft and +0.4 M, as well -4000 ft and +0.2M.
I'd take the second option straight next time. The change was noticeable and quick, let's say 10 minutes.
-2000 AND +0.2 was good enough to stabilize the temperature, without discernable improvement. Doing only one of them was not convincing.
-64 SAT and -41 OUTR TK on A1 grade. Inners -37 and that was the root of it.
Another nasty was the low tropopause with -64 well below the original FL, we got limited by environmental envelope during descent!
I'd take the second option straight next time. The change was noticeable and quick, let's say 10 minutes.
-2000 AND +0.2 was good enough to stabilize the temperature, without discernable improvement. Doing only one of them was not convincing.
-64 SAT and -41 OUTR TK on A1 grade. Inners -37 and that was the root of it.
Another nasty was the low tropopause with -64 well below the original FL, we got limited by environmental envelope during descent!
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The aircraft is certified to -70c. The fuel got to -30c. Jet A has an FCOM limit of -36c. We were cruising at FL340
A 319s limit is -70 from about 32,000ft up.
A 320s limit gets colder with altitude. So at 34,000ft the 320 CEO lowest temp is about -67 depending on how you read the graph. It is only -70 from around 38,000ft.
Last edited by EcamSurprise; 16th Feb 2018 at 09:34.
Turn on wing deice, worked for the dc10 over russia