KAP140 initiates left turn when first engaged

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Keith M
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KAP140 initiates left turn when first engaged

Postby Keith M » Thu Mar 16, 2017 7:34 pm

Yesterday, after a bit of hand flying, I pressed the AP button on my KAP140 to engage ROL mode, and the plane immediately banked to the left. I was on my own and didn't want to be heads down diagnosing the fault, so other than trying it a couple more times, I continued hand flying. On the ground, the stick moved to the left when the AP button was pressed, so it's a hard fault. Could the turn coordinator cause this behaviour?

The KAP140 Pilot's Guide doesn't give any diagnostic information, but would it indicate an error if the turn coordinator was completely dead?

Thanks in advance for any suggestions.
Keith
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Rich
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Re: KAP140 initiates left turn when first engaged

Postby Rich » Thu Mar 16, 2017 9:44 pm

Problem in the turn coordinator signal (or interface between it and the KAP 140) causes this exact behavior. I haven't had it happen in my plane but have seen it in some 172's.
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Keith M
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Re: KAP140 initiates left turn when first engaged

Postby Keith M » Fri Mar 17, 2017 2:31 pm

Thanks Rich. I've got an appointment to have it checked next week.

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