A350 ENG FAIL
Thread Starter
Join Date: Oct 2017
Location: USA
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
A350 ENG FAIL
After ENG FAIL on A320 and A330, when going through ECAM procedures, secondary failures, at ELEC , generally the APU is started.
A350 has 2 generators per engine so you have 2 generators remaining. What do most airlines recommend? Start APU or not. Airbus is silent on the matter and we have instructors who argue that 2 generators is just fine and others that argue for starting APU given that aircraft is designed to have 4 functioning generators, why not recover at least one? Thoughts?
Thank you.
A350 has 2 generators per engine so you have 2 generators remaining. What do most airlines recommend? Start APU or not. Airbus is silent on the matter and we have instructors who argue that 2 generators is just fine and others that argue for starting APU given that aircraft is designed to have 4 functioning generators, why not recover at least one? Thoughts?
Thank you.
Join Date: Dec 1998
Location: .
Posts: 2,997
Likes: 0
Received 0 Likes
on
0 Posts
The APU will autostart in a TEFO situation, the RAT or APU are only required in loss of both engines (TEFO) or loss of main electrical system, ALL 4 busbars.
Loss of 2 VFG's the FCOM says 'consider' the APU. You can actually dispatch with 2 GEN's inop (1 per side).
So no need to start the APU at all.
Loss of 2 VFG's the FCOM says 'consider' the APU. You can actually dispatch with 2 GEN's inop (1 per side).
So no need to start the APU at all.
Join Date: Sep 2011
Location: FL390
Posts: 241
Likes: 0
Received 0 Likes
on
0 Posts
It costs nothing to start the APU in this scenario, and if nothing else minimises load shedding.
Your aim is to make life easy for yourself. Should one of your remaining generators drop offline then you'll massively increase your workload, which you could have avoided entirely by starting the APU.
Your aim is to make life easy for yourself. Should one of your remaining generators drop offline then you'll massively increase your workload, which you could have avoided entirely by starting the APU.
Join Date: Sep 2007
Location: Among camels and dunes
Posts: 425
Likes: 0
Received 0 Likes
on
0 Posts
You could dispatch with APU inop under MEL and the aircraft will have the same outcome, continued safe flight to an alternate. So APU is an advantage and not compulsory.
Join Date: Sep 2011
Location: FL390
Posts: 241
Likes: 0
Received 0 Likes
on
0 Posts
Don't you think Airbus would have recommended starting the APU if they thought it was desirable? You do not need to turn the A350 into an A330.
Don't have the A350 FCOM or MEL - can you dispatch with APU and 2 VFGs inop?
