I'm sure that this has been discussed before... I'm trying to re-start the APU for ETOPS use. However, I keep getting a APU fault with low oil psi. I keep clearing in the CDU. Service based failures are disabled as well as all other failures, but I can't get it to start. Am I doing something wrong or is a know bug? Thanks!! FDX706

I'm sure that this has been discussed before... I'm trying to re-start the APU for ETOPS use. However, I keep getting a APU fault with low oil psi. I keep clearing in the CDU. Service based failures are disabled as well as all other failures, but I can't get it to start. Am I doing something wrong or is a know bug? Thanks!! FDX706

http://forum.avsim.net/topic/347126-apu-start-problem/

You say you are trying to "restart the APU for ETOPS use" which i assume you mean you are in flight.....keep in mind that the APU has a maximum altitude at which it can be started, and a maximum altitude at which it can be run.

Read something about max start altitude was FL250... However, aren't APU's on ETOPS rates aicraft able to do so? Searching the manual concerning this but can't find it. If anyone can answer my question feel free FDX706

Just read sonething concerning ETOPS: APU UsageAn operational APU is required for ETOPS flights. Due to the limited time thatthe B737 can operate on standby electrical power it is required that the APU berun continuously in ETOPS airspace. The policy for ETOPS flights is to startthe APU on the ground and leave it running until past the Extended Range ExitPoint (C-EXP). Continued operation of the APU beyond the C-EXP is at thediscretion of the Captain.Operation of the APU on non-ETOPS LRN flights is not required So, If the NGX simualates the max start altitude of FL250, then all makes sense. FSX706

learn something new everyday, thanks for that bit of info