Flyman35
1st Nov 2013, 11:32
Why in case of ENG 1 BLEED failure in PRO-ABN-36 P3/12 DESCENT TO FL100/MEA.But in ENG 2 BLEED failure (same reference page) DESCENT TO FL200/MEA
So why FL100 in first case and FL200 in second case?
Flyman35
You are reading from AIR DUAL BLEED FAULT. If ENGINE1 BLEED FAILURE is because of leak, fire or start valve failed open the APU bleed is to the left of crossbleed so cannot be used. Hence no pressurisation so descent to FL100. If you go down and read ENGINE2 BLEED FAILURE for the same reason it asks you check crossbleed is closed and tells you to start the APU and below FL225 use APU bleed which is to the left side of the closed crossbleed, so can be used. It allows you to maintain FL225 which is the maximum altitude on APU bleed. If the dual bleed loss was do to other reasons then also you can use APU bleed and keep FL225.