CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 9-40
TO TRANSMIT MODE A (AIRCRAFT IDENTIFICATION) CODES IN FLIGHT:
1. Reply-Code Selector Switches – SELECT assigned code.
2. Function Switch – ON.
3. DIM Control – ADJUST light brilliance of reply lamp.
NOTE
During normal operation with function switch in ON position, REPLY
lamp flashes indicating transponder replies to interrogations.
4. ID Button – DEPRESS momentarily when instructed by ground controller to “squawk IDENT”
(REPLY lamp will glow steadily, indicating IDENT operation).
TO TRANSMIT MODE C (ALTITUDE REPORTING) CODES IN FLIGHT:
1. Off Indicator Warning Flag – VERIFY that flag is out of view on encoding altimeter.
2. Altitude Encoder Altimeter Setting Knob – SET IN assigned local altimeter setting.
3. Reply-Code Selector Switches – SELECT assigned code.
4. Function Switch – ALT.
NOTE
When directed by ground controller to “stop altitude squawk”, turn
Function Switch to ON for Mode A operation only.
NOTE
Pressure altitude is transmitted by the transponder for altitude squawk
and conversion to indicated altitude is done in ATC computers. Altitude
squawked will only agree with indicated altitude when the local
altimeter setting in use by the ground controller is set in the encoding
altimeter.
5. DIM Control – ADJUST light brilliance of reply lamp.
TO SELF-TEST TRANSPONDER OPERATION:
1. Function Switch – SBY and wait 30 seconds for equipment to warm-up.
2. Function Switch – ON or ALT.
3. TST Button – DEPRESS and HOLD (Reply lamp should light with full brilliance regardless of DIM
control setting).
4. TST Button – Release for normal operation.
SECTION 5 – PERFORMANCE
There is no change to the airplane performance when this avionic equipment is installed. However, the
installation of an externally mounted antenna or several related external antennas, will result in a minor
reduction in cruise performance.
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