Hi All I was having an issue until i did some research on the internet, when you start an engine with the air start you must run up the operating engine to around 35-40% to supply sufficient compressed air for a cross bleed start the other engine, I initially thought you could start both with the air unit but is realistic very well modeled

You could have better made this post under the one where you told us it was not working. Better for learning and keeps the database somewhat clearer. Thanks for sharing. Maikel Rozemeijer.

You only need to run the operating engine to provide at least 30psi. I think that comes to about 28% N1.

A busted APU can make for a long day. IIRC, it is closer to 40%N1.