KFC200 Troubleshooting

[Bob - S50]

Looking for collective wisdom.

The last few flights, shortly after start with everything turned on, our KFC200 system would start beeping at us.  If we press the test button it goes away for maybe 15 seconds and then comes back on.  Usually it only does that a few times and then stays quiet.

Yesterday, instead of beeping at us, after we got airborne the elevator trim/CB turned off.  We reset it and it turned off again a few seconds later.  We flew for about 2 hours with it off using manual trim.  Then on the 3rd leg of the day we decided to try turning it on again and it worked fine.  However, even though the trim was working, they system started beeping at us again.  While it was beeping I turned off the elevator trim and the beeping stopped.

The flight director still works fine.

After landing we ran the manual trim through the limits and did not find any binding but we did notice that it takes quite a bit more effort to trim nose up than nose down.  However, that kind of makes sense.  When trimming nose down, we are moving the tail down and gravity is helping us.  When trimming nose up, we are working against gravity.

I'm thinking this is a problem somewhere in the elevator trim system, and most likely the servo.

What do you think?

Thanks

[milotron]

Is this is the same beeping sound that is made when the trim switch is off during startup?

 

iain

[Bob - S50]

10 hours ago, milotron said:

Is this is the same beeping sound that is made when the trim switch is off during startup?

 

iain

I doubt it.  We never have the switch off during start.  I never hear beeping during the start.  Besides, when it was beeping in flight, turning the switch off made it stop.