Hey guys,

 

I'm familiar with the DUAL BLEED annunciator above the pneumatics panel when the APU bleed air valve is open and the position of the engine bleed and isolation valve switches allow for the possibility of back pressure on the APU, however I don't seem to get the behaviour I expect when running the engines in dual bleed.

 

I've heard that increasing thrust beyond idle under dual bleed conditions can cause the APU to stall and overheat, resulting in an automatic shut down. I tried this with full thrust; the APU didn't bat an eyelid and the EGT gauge remained at 425 Celsius.

 

Is this behaviour modelled in the NGX, or is this not an IRL issue?

 

All the best,

 

Louis

There are check valves to prevent this problem, as well.

It is possible that you dont see anything happening because as Matt said there could be check valves to prevent that, the habit of not using above idle ensures, that if a check valve does fail, you wont know right away until the APU starts to go funky when you use more than idle thrust with dual bleed. Only the developers could tell us if its simulated or not