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KAP140 Issues

10 Posts

Hello,
Today, my autopilot Bendix KAP140 (Installed on a C172 Skyhawk + G1000) got an issue:
The pft (pre-flight -test) is ok + tone but it displays 5 digit (dash) instead of pressure.

I try to push baro button, an turn knob, but it seem to “freeze” and I can’t enter any digits.

For information : AP engages when AP pushbutton is pressed and I can set a VS for example)
A technician enter in diag mode ( via RS232 and terminal), but he wasn’t be able to solve the problem. ( No fault code)
Have you ever seen that ?
Thanks a lot for your help !

(Sorry for my poor english , bur i’m french)

LFCK, France

Does the electric trim work after self-test?

LDZA LDVA, Croatia

Yes. the trim works

LFCK, France

Godzillou wrote:

The pft (pre-flight -test) is ok + tone but it displays 5 digit (dash) instead of pressure.

What exactly is “5 digit (dash)”. Do you mean it displays five dashes (“– – – – –”)?

Last Edited by Airborne_Again at 20 Jul 08:43
ESKC (Uppsala/Sundbro), Sweden

yes. “_ _ _ _ _” on display of the KAP 140

Last Edited by Godzillou at 20 Jul 09:12
LFCK, France

more infos today.
With the rs232 interface we have error code 190
“Error in encoding altimeter input”

LFCK, France

Godzillou wrote:

yes. “_ _ _ _ _” on display of the KAP 140

According to the KAP140 Maintenance Manual that means “Invalid altitude code from altimeter” which agrees with the 190 error code.

The MM says about the 190 code: “The parallel altitude information from the altimeter is not a valid Gilham code. The altimeter may be powered off or there may be a broken wire in the harness. The Altitude ARM mode will be disconnected if this occurs.”

ESKC (Uppsala/Sundbro), Sweden

Thanks a lot. we’re going to check the wiring.

LFCK, France

Hello.
After investigation the KAP140 doesn’t take baro press from altimeter.
it takes it from the internal port.
In the parameter Baro set is on “0”
We must enter manualy tje pressure via rotary knob.
But actually we can’t set anything because it’s dash
“_ _ _ _ _”.

LFCK, France

Finally we re-enter Baro set information ( pin assign analog output ) on GIA 2
Problem solved !

Thanks a lot

LFCK, France
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