Any time the function switch is in the ON or ALT position the transponder becomes an active part of the beacon system. Select ON or ALT as late as practical prior to takeoff and switch to OFF or SBY as soon as practical after completing landing roll unless the change to SBY has been accomplished previously at the request of ATC.
Code Selector
The code selector consists of four, eight position switches that provide 4,096 active identification codes. Attention should be paid to the selected identification code. The selected code should be in accordance with instructions for IFR flight or rules applicable to transponder utilization for VFR flight.
When making routine code changes, you should avoid inadvertent selection of codes 7500, 7600, or 7700 thereby causing momentary false alarms at automated ground facilities. For example when switching from code 2700 to code 7200, switch first to 2200 then 7200, NOT to 7700 and then 7200.
This procedure applies to nondiscrete code 7500 and all discrete codes in the 7600 and 7700 series (i.e.,
Important Codes
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See the Airman’s Information Manual (AIM) for a detailed explanation of identification codes.
IDENT Button
On occasion, the controller will request “SQUAWK IDENT”. Respond by momentarily pressing and releasing the IDENT button. Pressing the IDENT button activates the Special Position Identification Pulse (SPI) for approximately 20 seconds identifying your transponder return from other aircraft on the controller’s scope.
Reply Light
The reply light will blink each time the transponder replies to ground interrogation. The reply light remains lit up during the IDENT time interval.