Cessna 152 - Transmitting Mode C and Self-Test Operations

PILOf'S OPERA TING HANDBOOK
SUPPLEMENT
CESSNA 300 TRANSPONDER
AND ENCODING ALTIMETER
(2) Function Switch
-- ON.
(3) DIM Control -- ADJUST light brilliance of reply lamp.
NOTE
During normal operation with function switch in ON posi-
tion, reply lamp flashes indicating transponder replies
to interrogations.
(4) ID Button -- DEPRESS momentarily when instructed by ground
controller to "squawk !DENT" (reply lamp will glow steadily, in-
dicating 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 Knobs -- SELECT assigned code.
(4) Function Switch -- ALT.
NOfE
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 alti-
tude 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.
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