KFC-150 Autopilot Nav mode

[taters]

The nav mode on a kfc-150 wont work anymore on an A-36 I fly . The FD bars and the plane just kind of leans over to the left and drifts off, and even gets the lateral "wiggles" sometimes..it also wont fly a localizer worth a crap. At the direction of a well known autopilot shop.
- I have had the course datum output checked ..works fine.
-the attitude indicator over-hauled (it needed it)
-and most recently the roll servo overhauled . As suspected by the shop the roll servo did have a starting voltage issue. improved the function of heading mode to flawless and no more "wiggles" of the F/D and airplane.

The nav mode still wont track however..anyone been here before? this is mostly a nuisance as I can fly the pink line with the hdg bug in cruise but it still drives me crazy.

many thanks

 

[HPNPilot1200]

Do you have GNSS roll steering? In the Bonanza I fly, we have a push annunciator which displays either "HDG" or "GPS" which the KFC150 uses to select what to follow in HDG mode. Nav mode is only used in our Bonanza when tracking a VOR/localizer/etc.

If not, I am stumped. What does the avionics shop say? We have a KFC150 in both the Bonanza and the Mooney and I've never had an issue with either unit.

Best,
Jason

 

[John Collins]

The nav mode on a kfc-150 wont work anymore on an A-36 I fly . The FD bars and the plane just kind of leans over to the left and drifts off, and even gets the lateral "wiggles" sometimes..it also wont fly a localizer worth a crap. At the direction of a well known autopilot shop.
- I have had the course datum output checked ..works fine.
-the attitude indicator over-haled (it needed it)
-and most recently the roll servo overhauled . As suspected by the shop the roll servo did have a starting voltage issue. improved the function of heading mode to flawless and no more "wiggles" of the F/D and airplane.

The nav mode still wont track however..anyone been here before? this is mostly a nuisance as I can fly the pink line with the hdg bug in cruise but it still drives me crazy.

many thanks

Clay,

If you follow the FD when in NAV mode and it points you in the wrong way, the problem is not expected to be in the servos, especially if heading mode works OK. Heading mode checks out the servos and the AI. NAV mode depends on the NAV radio providing the correct outputs, the HSI for the course pointer and the Nav computer to determine the FD guidance. If your avionics shop has the KFC150 on their certificate, they should be able to isolate the problem in short order, especially if it is not intermittent.

 

[taters]

Thanks for the replies,

NO GPSS, just analogue nav steering, but that will track a GPS signal just fine.
We coincidently did go from a KLN-90 to a Garmin 155XL and it made no difference, same exact issue. At least the wiggles are gone, passengers notice that. I like these autopilots (when they work of course). I think Im gonna send remaining components down and have them checked out..Im still not convinced that HSI is right....but thats just a gut feeling and nothing more.

 

[taters]

Do you have GNSS roll steering? In the Bonanza I fly, we have a push annunciator which displays either "HDG" or "GPS" which the KFC150 uses to select what to follow in HDG mode. Nav mode is only used in our Bonanza when tracking a VOR/localizer/etc.

If not, I am stumped. What does the avionics shop say? We have a KFC150 in both the Bonanza and the Mooney and I've never had an issue with either unit.

Best,
Jason

Sounds like an S-Tec. Alot of people think they have a problem with nav mode when they dont since you have to engage HDG mode then GPSS.

 

[lilla]

We've recently bought a C182R from USA & had it shipped to Malaysia where
we reside. we wonder if you may have the Installation manual for KAP 100
autopilot for CESSNA 182R STC SA177DCE-D The engineer here cannot work out how to
connect it to the aerilon as the disconnected cable haven't been marked. Would
appreciate your help very much, many thanks in advance.

anyone with info on this where to subscribe/buy/download please let me know or email me at diela.mohd@gmail.com you help is appreaciate....

have a nice day....