What tells a Wing Leveler its position?
If it's an old Century 1 autopilot (wing leveler) it's a turn coordinator. What kind are you referring to?
Wright Brothers Master Pilot, FAA Commercial Pilot
Aviation Director, Piper Owner Society Forum Moderator and Pipers Author.
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My old unit in my 1970 Cessna utilized VOR for position info. Not much help!
In the case of the Tru Trak Vizion, it has an internal sensor that tells it when it's level.
I love to defy gravity!
1979 Arrow IV
I have a Vision install scheduled for June 3. Anticipating the date already!
Mine is like Scott described. A Century 1
On my 76 Arrow it is the ADI. (Piper Altimatic 111B)