Quote:
Originally Posted by gasman
Then a safe way to wire the trim is to have it active only when the auto pilot is disengaged..... unless you HAVE auto trim.
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You're just moving the failure point around. You'd have to have a relay in the trim circuit, activated by power to the autopilot servo, and there are ways for *that* to fail, either open or closed. Not to mention that failure of the relay might cause a failure of the autopilot itself (which could be particularly bad if, say, in IMC).
FMEAs are not as simple as just adding more complexity to the system.
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