a-109e fadec question
 

I fly an agusta 109-e (power) with fadec. The system has a setting for torque matching. Normally engine Q stays matched between the egines (within 1 or 2%). The problem occurs on take off. when you pull power up to about 90% the engines begin to flucuate (one will go to about 105% the other drops to around 85%). They continue to oscillate back and forth with each oscillation getting smaller until they eventually even out and then stay matched. No one can seem to figure out the problem. anyone else dealing with this?

fedac A109e
 

hi how offne UR engineer reluod the softwer

I think heema is on the right track. it's a system dynamics problem that should be taken care of in the FADEC software. You seem to have a version that is unstable at this condition.

There's also the possibility that the fuel metering valve on one engine is slow to respond at high power.

Wouldn't this get more response in the rotorhead section?

It may also be that the two engines do not have matched software versions.