I've had this happen to me repeatedly...the engine starts normally (without overtemp) and about the time the starter disengages the engine shuts completely down. It's driving me nuts.The engines are on the stops...put there manually with the pumps and visually verified before pressing the start switch.Any ideas??RegardsBob ScottColonel, USAF (ret)ATP IMEL Gulfstream II-III-IV-VColorado Springs, CO

First thought regards the LP fuel pumps. Those need to be on for start, but there isn't much else that I can think of.If the engines start at all, then you are most certainly on the start locks.

For some reason thats happened to me a few times when starting with the generators on.... Not sure why. Doesn't happen anymore, but then again, I make sure the gennies are off before I crank em up.JB

For some reason thats happened to me a few times when starting with the generators on.... Not sure why. Doesn't happen anymore, but then again, I make sure the gennies are off before I crank em up.JB

If your on ground power, having the gennies on doesn't appear to affect the start, (although this is not correct procedure) Fuel pumps in off however does produce a false start.

I start left engine and once it has completely started just press F1 and wait for RPM to settle to 72%...then start right eng. No problems

Bob,This bit me about a week ago...spent three hours troubleshooting it. Check your throttle quadrant calibration. You may have to do it more than once. FSX periodically "forgets" your controller calibration (at least it always has done with mine), and this may be the source of your problem.

Turning the gens off before start seems to have solved it.I use a PFC quadrant and the dead zone at idle is sufficiently large to keep the throttles at zero without jitter.A small bug: I also note that the unfeather pump works without any power applied to the acft.I'll give it a few more tries, but the gens looks like the culprit...I wonder what logic under the hood would produce that...Thanks for the help, gentsBob ScottColonel, USAF (ret)ATP IMEL Gulfstream II-III-IV-VColorado Springs, CO

Turning the gens off before start seems to have solved it.I'll give it a few more tries, but the gens looks like the culprit...I wonder what logic under the hood would produce that...

With the coil energized on the gennies, it should just be more difficult to crank the turbine due to more resistance, but it shouldn't start then stop. I would guess that the logic is cutting the engines after start since it would be easier than having to program custom logic to add more resistance.JB

I don't know, but remember these are one and the same. The generator is the starter, so without knowing the exact workings under the hood it makes sense to let the critter be one or the other but not both.

With the coil energized on the gennies, it should just be more difficult to crank the turbine due to more resistance...

There will only be more resistance if the generator is feeding load, which it is not, because it is not connected to any load during startup. According to the AOM the GLC (Generator Line Contactors) only close (onto the load busbar) when engine RPM has reached 60%. i.e. it seems that the gens only kick in after the engine has started - not while it is being cranked by the starter. Probably don't need the starter any longer after 60% RPM. I think this would apply irrespective of whether the starter and gen are one and the same piece of equipment or separate units.

I hate to say it, but I haven't read every section of the AOM. Now enlighten me on something. If the gennies are the starters, then obviously polarity is getting reversed durring startup to the coils. This would mean that the Genny switch position durring startup is pretty irelivent and wouldn't make a difference until the start cycle is over. Is all this correct? If so, then whats with the logic behind shutting the engines down after startup if the genny switches are in the on position?JB

Maybe I am experiencing the same problem here. To be excact, the engines are starting, but during the routine they suddenly stop. EGT is fine below 700Fuel pumps are ONPower: I am using a quadrant (saitek) and keep thrust just above the extinguished 'reverse' lights. Also tried whithout quadrant with just F2 + F1Something I see is the RPM. It is climbing to slow, and it never gets to 60 at all. At around 49.5 the engine stops, and a little before that it sounds like the engines stops turning, but then starts again (a couple of times). RPM is supposed to climb > 1% per second right? Here it takes much longer. It starts quick until 14%, then it falls back to 10% and from there it's slow. I can't get it to start.Is it the same problem?B.T.W. I am using a clean install of Windows Vista SP2, Fresh install of FSX + SP1 + ACCELERATION, GTS 250 GRAPHICS and a Quad Core comp. Track Ir 5

Maybe I am experiencing the same problem here. To be excact, the engines are starting, but during the routine they suddenly stop. EGT is fine below 700Fuel pumps are ONPower: I am using a quadrant (saitek) and keep thrust just above the extinguished 'reverse' lights. Also tried whithout quadrant with just F2 + F1Something I see is the RPM. It is climbing to slow, and it never gets to 60 at all. At around 49.5 the engine stops, and a little before that it sounds like the engines stops turning, but then starts again (a couple of times). RPM is supposed to climb > 1% per second right? Here it takes much longer. It starts quick until 14%, then it falls back to 10% and from there it's slow. I can't get it to start.Is it the same problem?B.T.W. I am using a clean install of Windows Vista SP2, Fresh install of FSX + SP1 + ACCELERATION, GTS 250 GRAPHICS and a Quad Core comp. Track Ir 5

EGT's gotta be below 200... In this case it might be shutting down to overtemp or low batt voltage if your starting with no ground cart.JB

SanAir (please sign your name to posts in this forum).You are describing exactly the symptoms of not being on the stop locks. If you keep cranking you will break the aux shaft. have you broke it yet?

This would mean that the Genny switch position durring startup is pretty irelivent and wouldn't make a difference until the start cycle is over. Is all this correct?

At least in the King Air if I recall correctly which also has generator/starter dual use you can't have generator on-line while cranking the engine. If you attempt to crank the engine with gen online it will throw the gen off line.