Garrett are easier than pistons...more clear cut...
You have got to be joking.
SRL's on or off whats the limits for the day.
HAve you got nicads or concord batteries.
Is the GPU a plugged in job and the airport lights dim when you hit the start button or is it a plugged in job and the aircraft tries to rotate round the prop on start.
If a cart GPU does it turn the Apron IMC when you hit the button or does it just hum a bit more. Or is there a big bang when it drops out just after light up and you then have to fanny around with a vent run or jump out and spin the props. Both methods may involve 50ft of flame shooting out the back and scaring the crap out of anyone near by.
How near is the engine for coming off the wing and what state is the starter gen in.
There is huge variations in starts with garrettes.
At least with a donk the sod starts or it doesn't and you don't have to have a sixth sense to guess if your just about two write off quarter of a mills worth of engine.