KAP140 Autopilot Weirdness

"Jon Kraus" wrote in message
...
Yea... Gotta have someway to combat that awful Skyhawk yaw..... ;-)

Dan Luke wrote:

"Brien K. Meehan" wrote:


It's a 3-axis


Really?

And ............ Try Being Overweight and Really Really AFT CG, 300 Miles
from land and have the KAP140 start having spookiness to it !!! Anyway!!!!
KAP140 is a good AP I have a few hours behind it! Just always know where the
breaker is and know how to shut the thing off!! Nothing like the brand new
Cessna's with G1000 and xm radio/weather but still not worth almost $275,000
or more!

KAP140 is a good AP I have a few hours behind it! Just always know where the
breaker is and know how to shut the thing off!! Nothing like the brand new
Cessna's with G1000 and xm radio/weather but still not worth almost $275,000
or more!

G1000 or not, it still runs on a KAP140 autopilot...
Gerd

Dan Luke wrote:
Really?

I was going to get the 4-axis model, but they're expensive.

"Brien K. Meehan" wrote in message
oups.com...
Dan Luke wrote:
Really?

I was going to get the 4-axis model, but they're expensive.

Not as expensive as the time dilation model.

On 8 Sep 2006 23:51:56 -0700, "Brien K. Meehan"
wrote:

My autopilot has started fighting with me, and I'm afraid it's going to
win.

It's a 3-axis KAP140 in a Skyhawk SP. What it's doing is ... well, it
just starts turning.

After about an hour, it goes into a turn, unannounced. There doesn't
seem to be anything instigating it. It's usually to the left, and
always a "standard" turn.

It ignores the heading bug in HDG mode. It ignores the GPS or VOR head
in NAV mode. It also ignores the ROL mode, and the APR mode - yikes!

I don't know how far it would turn if I left it alone, because the few
times it's happened so far, I've been going somewhere.

Is this a common failure? Does anyone know what might be causing this?
Is my autopilot trying to kill me?

Unfortunately, it's quite common. Usually ends up being the roll
servo.

Interesting... I thought that the KAP140 was a 2-axis AP...

It sounds like your roll-servo is going south... Not bad to replace
because you just swap the old one out and the new one in..

Good luck!!

Jon Kraus
'79 Mooney 201
4443H @ UMP

Brien K. Meehan wrote:
My autopilot has started fighting with me, and I'm afraid it's going to
win.

It's a 3-axis KAP140 in a Skyhawk SP. What it's doing is ... well, it
just starts turning.

After about an hour, it goes into a turn, unannounced. There doesn't
seem to be anything instigating it. It's usually to the left, and
always a "standard" turn.

It ignores the heading bug in HDG mode. It ignores the GPS or VOR head
in NAV mode. It also ignores the ROL mode, and the APR mode - yikes!

I don't know how far it would turn if I left it alone, because the few
times it's happened so far, I've been going somewhere.

Is this a common failure? Does anyone know what might be causing this?
Is my autopilot trying to kill me?

In article ,
Jon Kraus wrote:

Interesting... I thought that the KAP140 was a 2-axis AP...

KAP comes in 1-/2-and 3-axis.

"john smith" wrote in message
...
In article ,
Jon Kraus wrote:

Interesting... I thought that the KAP140 was a 2-axis AP...

KAP comes in 1-/2-and 3-axis.

Direct from cessna web site!

NAV II Avionics (Bendix/King) - NAV I Avionics Plus:

KAP 140 Two-axis Autopilot with Altitude Preselect

NAV III Avionics (Garmin): Delete Standard Avionics and Add:

Fully Integrated G1000 EFIS System presented on two 10.4" high resolution
XGA displays
(PFD/MFD) - Attitude Heading Reference System (AHRS) - Solid State Air Data
Computer (ADC) - Solid State 3-Axis Magnetometer - Engine Indication and
Crew Alerting System (EICAS) - Dual Nav/Comm (16 Watt) - Dual IFR
Enroute/Approach Certified and WAAS upgradeable GPS - Fully Integrated Mode
S Transponder - Digital Audio Panel - Traffic Information System (TIS),
Terrain and Obstacle Mapping (Topographic and Relative) - Backup Airspeed,
Attitude and Altimeter - Standby Battery - KAP 140 Two-axis Autopilot with
Altitude Preselect - XM Weather and Radio.

On Sat, 09 Sep 2006 23:33:21 GMT, john smith wrote:

In article ,
Jon Kraus wrote:

Interesting... I thought that the KAP140 was a 2-axis AP...

KAP comes in 1-/2-and 3-axis.

KAP 140 only comes in one or 2 axis, roll or pitch and roll, it
doesn't control yaw. The KFC 225 has a yaw damper connection.

Altitude preselect is not an axis.