If it's failing and/or on fire, you want the power off. Two: operationally, it is sometimes necessary for ATC to request planes on the ground turn off their transponders to declutter the radar.
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U.S. military aircraft can opt to turn their transponders off, he said, adding that because the United States and other free countries have taken the approach that data should be open to everyone, “there's not a whole lot you can do about it.”
Code 0000 should never be assigned or used. However, NASA recommends that crews set 0000 after landing to help detect when a clearance has not been received. Resetting the transponder to 0000 (four zeros) after landing can help you, or the next crew, detect lack of a PDC.
Two-way radio communications and operational transponder are normally required for operations within Class C airspace, but operations without radio communications or transponder can be conducted by LOA, facility directive, or special arrangement with Class C airspace controlling facility.
Penney worried about missing the target if she tried to bail out. If you eject and your jet soars through without impact . . . she trails off, the thought of failing more dreadful than the thought of dying. But she didn't have to die.