Radio Navigationeasy#1198
Transponder IDENT (SPI - Special Position Identification) causes:
A
The transponder to switch off
B
The aircraft's radar return to bloom/highlight on the controller's display for identification
CorrectC
An automatic frequency change
D
A MAYDAY signal to be transmitted
Explanation
Pressing IDENT sends a Special Position Identification pulse that highlights the aircraft on the ATC radar display for 15-30 seconds to confirm identity.
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