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why the PWS needs the transponder to work?
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To answer the "why" part...
If the transponder is in the ON/AUTO etc. position there is a good chance you are about to take-off, and not sitting in the hangar with the PWS accidentally switched to AUTO. Stops it transmitting without good reason.
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when we have an engine failure the STATUS says both PFD on the same FAC, why
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Nothing to do with an engine failure....