Auto Pilot Fails When Cold
I have a 337H with a 400B auto pilot. Every time I go up & temp. is below 15 degrees F, the auto pilot fails after about 1/2 hour. I just went up this week-end, after doing pre-heat of engines & got the plane all warmed up in hanger, I went flying, it was 5 degree F . Every thing work fine for 1/2 hour in the air. Than the alt. hold went crazy. We dove at 1000 feet/min, than climb same rate, than off to the left. I grabbed the yoke & disengaged the auto pilot. But it would not release. I had to over power the auto pilot than it finally released. This is nerve racking for passengers when you don't expect it. Anyone have a answer?
Dale Campbell
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