Cessna 182S Pilot Operating Handbook page 264

SECTION 9 - SUPPLEMENTS
SUPPLEMENT 2 - FAA APPROVED
CESSNA
MODEL 182S
2. Mode Selector Knob -- ON.
NOTES
• Duri ng normal operation with Mode Selector Knob
in ON position, reply indicator flashes, indicating
transponder replies to interrogations.
• Mode A reply codes are transmitted in AL T also;
however, Mode C codes are suppressed when the
Mode Selector Knob is positioned to ON.
3. IDT Button -- DEPRESS momentarily when instructed by
ground controller to "squawk IDENT" ("R" will illuminate
steadily indicating IDENT operation) .
TO TRANSMIT MODE C (ALTITUDE REPORTING) CODES IN
FLIGHT:
1. Transponder Code Selector Knob -- SELECT assigned code.
2. Mode Selector Knob -- ALT.
NOTES
• When directed by ground controller to "stop
altitude squawk", turn Mode Selector Knob to ON
for Mode A operation only.
• Altitude transmitted by the transponder for altitude
squawk and displayed on the KT 76C panel is
pressure altitude (referenced to 29.92") and
conversion to indicated altitude is done in the
ATC computers.
TO SELF-TEST TRANSPONDER OPERATION :
1. Mode Selector Knob -- TST Check all displays.
2. Mode Selector Knob -- SELECT desired function .