CH Throttle Quadrant

[RAFAIR100]

I have used the CH Throttle Quadrant for years on all types of aircraft.    Recently, I have had trouble with the throttle axis which, occasionally, will not hold a throttle setting.     For example, on take off at full throttle, I get the specified manifold pressure.     Halfway down the runway, still at full throttle, the manifold pressure drops of to about 1/2 to 2/3 value.     Thereafter, the throttle control becomes inoperative and the manifold pressure becomes jittery.      I can't decide where the problem lies - with the controller or with the aircraft.    The problem occurs with all aircraft but not all the time.     Does anyone have any ideas?

[ozzy72]

It could be something to do with the actually variable resistor in the throttle. Have you opened up the throttle to take a look and also check for dry joints?

[Brett_Henderson]

That definately sounds like a dirty potentiometer.

[RAFAIR100]

Thank you for the replies.     Some cleaning seems to be indicated.