from the accident report...
After the aircraft crossed the Ural mountain range in Russia it climbed further to FL380 where the ambient temperature dropped to as low as minus 76°C
What is the enviornmental envelope re min temps for the 777. I know the airbus 320 is -70c
Does anyone know the answer to this question?
No, but it's not the minus 70 that the single aisle airbus's are limited to. After flying the airbus it was something I looked for and it isn't in any of the manuals (BA) so the 777 can be flown in colder air.
Some posters here have mentioned at what temp the low fuel temp warning would activate. On BA 777's the fuel freeze temp can be changed in the FMC but is set to -40 by default, the actual warning starts at 3 degrees above that value. So by default (but it can be changed) he low fuel temp warningwould sound at minus 37.