Sokol,
"Just think a bit about it, You´re starting the engines with bleed air..." Yep, I've thought about it and you are correct, most turbine jet engines are started with bleed air..... from the apu or ground cart or x-bleed after another engine is started. I fail to see your point.
Speedwinner,
As RAD ALT pointed out re the smaller diameter inlet on the IAE, possibly the x-wind limit imposed is to prevent engine stall/surge/hot start on engine start up due air blowing past the inlet and the engine "choking" so to speak. In any strong x-wind it would surely be wise to start with aircraft into wind. Hope this helps.
McHale.
