PPRuNe Forums - View Single Post - AUTO MODE of Transponder
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Old 18th Jan 2011, 04:09
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ahramin
 
Join Date: Jan 2007
Location: Canada
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ALT turns on both the mode A transponder and the mode C altitude reporting.

On turns on only the mode A, for use when the mode C altitude reporting is not working properly.

Auto is the preferred setting, and will turn on both mode A and mode C, as well as mode S when applicable.
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