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Response to Lost_Count (Original post)

Thu Mar 13, 2014, 12:10 PM

1. Certain airspace requires an encoding altimeter and...

transponder. Under part 121, which I think is what you're referring to there is never any reason to turn off your transponders. If you show up on ATC radar as a primary target (transponder is off) they will tell you to "check your transponder". But most all commercial aircraft have 2 transponders.

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