KFC 200 problems!!

[manu damaschin]

I had a problem with my KFC200 yesterday: when I pressed short 2 times the down button (for a 200 ft/min descending) the aircraft was pitching down very fast and continuously until I disengage the A/P. In 3-4 seconds I was descending 1500 ft/min...!!!!

With the A/P disengaged the electric trim was working properly.

Any thoughts?

Tks!

Manu

[aviatoreb]

I don't know what is wrong but - I have two thoughts.

 

1) Autopilot central - they have been brilliant in fixing my KFC200 better than the day it was new.

 

2) Having the autopilot go nutz like that and then having my A/P disengage is my biggest nightmare (I am not sure if such a thing is possible but it has occured to me) so I put a colored breaker cover on my AP breaker so that if all else fails I can pull the breaker quickly to arrest control.

[jimbrod]

I second the autopilot central recommendation - they do a great job, very professional and at a fair price.

[CaptRJM]

Known weak spot is the capacitors in the KC 295 Flight Computer.  Autopilots Central rebuilt it 3 years ago and it now performs perfectly!  But, once you get it back it is important to have an avionics shop "marry" the HSI and Flight Director to make sure all voltages are set properly.  If voltages are not correct you may have non standard rate turns or steep climbs/descents.

 

But, before doing all that I'd fly the plane again to make sure that the problem can be replicated and it wasn't just something like a stuck switch in the mode controller or accidently holding the switch in the down position too long.  To get a 500-700 FPM descent I usually only hold the switch in for a little over a second while still at cruise power.

[manu damaschin]

...thanks for replys!