A320 and ETOPS
Hi all,
Was hoping to get some clarification on the A320's electrical architecture when it comes to ETOPS.
My understanding is that in order to avoid the use of ones APU on an ETOPS sector, three independent and continuous sources of power are required. In the case of the A320, this is accomplished as follows:
1. Power from LH engine driven generator
2. Power from RH engine driven generator
3. Power from HMG, coupled to LH and RH pumps
If one engine fails, you still have 1 EDG, and the HMG connected to the good EMP. If both engines fail, you then deploy the RAT to power the HMG.
I'm really hoping someone can clarify this third method for me... Is my top level description correct, or am I missing something crucial here?
Cheers,
00Viggen