Cessna 152 - Page 227

PILOT'S OPERA TING HANDBOOK
SUPPLEMENT
CESSNA400TRANSPONDER
AND ALTITUDE ENCODER (BLIND)
(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 ID ENT" (reply lamp will glow steadily, in-
dicating IDENT operation).
TO TRANSMIT MODE C (ALTITUDE REPORTING) CODES IN FLIGHT:
(1) Reply-Code Selector Switches -- SELECT assigned code.
(2) 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 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 aircraft altimeter.
(3) 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.
(3) TEST Button -- DEPRESS (reply lamp should light brightly
regardless of DIM control setting).
(4) TEST Button -- RELEASE for normal operation.
1 July 1978
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