Engine in-flight restart
I've a doubt about general aviation jet engines in case of in-flight flame-out: is it true that having a small fan diameter, those engines are very hard to restart in flight by windmilling? and therefore needing bleed air (APU) or gen/starter to be restarted. The Citation X manual recommends the use of APU below 18000ft; is that for the windmill restart problem? Can someone enlighten me about this problem?
B_D