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#28
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![]() "Judah" wrote in message . .. "Al" wrote in : Some autopilot failures are very subtle. I was shooting a coupled ILS to minimums with a King autopilot in a Mooney. After capturing the glideslope, I noticed the rate was about 75'/min more than I was used to. As we got closer to DH, the DME was still showing about 2 miles to the airport. I leveled at DH, and while motoring along 200' above the houses, I tapped the Vor/loc. The GS needle snapped to the top of the case. It was "stuck" centered, and the autopilot was literally flying the needle. Iron Mike, indeed. Technically speaking, that wasn't an autopilot failure, it was a GS needle failure. Correct. The results would have been nearly identical if you were hand- flying. Although you might have noticed inconcistencies in airplane response more quickly and fixed it earlier. Naw, If I'd set the plane up for the descent, and got it exactly right the first time, with no additional trim, I'd be real suspicious...Never happened before. Then again, you might have been so busy keeping the needle centered that it would have gone unnoticed until you flew your plane right through someone's living room. Hard to say. It's really a matter of cross checking and a cynical attitude. Al |
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