Textron Cessna 172S Skyhawk SP, Information Manual

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CESSNA
MODEL 172S
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 16
.....,.
'
. SUPPLEMENT
. . . l
•
BENDIX/KING KT 73 MODE
S
TRANPONDER
SECTION 1
. GENERAL
The Bendix/King Mode S Transponder (KT 73), shown in Figure
S16-1, is the airborne component of the Air Traffic Control Radar
Beacon System (ATCRBS). The transponder enables the ATC
ground controller to accurately identify the airplane on the
radarscope.
The KT 73 Transponder system consists of a transponder unit
mounted in the instrument panel,. an analog pressure altitude
encoder, ahd an externally-mounted L-Band antenna. The KT 73
Transponder system installation uses the same antenna, altitude
encoder and mounting hardware as the 'Bendix/King KT76C
Mode
AlC Transponder. The KT. 73 Transponder operates in Mode A
("SQUAWK"), Mode C (altitude reporting), and Mode S(elementary
surveillance/selective interrogation). . The transponder receives
interrogating signals on 1030 MHz ahd transmits coded reply
signals on 1090 MHz. In Mode C operation, the KT 73 provides
altitude information automatically to ATC ground stations. The
transponder reports altitude in'1 OO-foot increments between -1000
and +20,000 feet MSL. Mode S. allows the ground station to
individually interrogate the airplane' by the unique 24-bit address
assigned to the airplane. .
The KT 73 Transponder features an all solid-state transmitter with
microprocessor controls.
Rotary control kno,bs' are used to control
the operating mode and to set the squawk code. The gas discharge
display shows. all functions
including the flight level (pressure
altitude), . airplane identification (SQUAWK), and surveillance
interrogator (SI)' code' (airplane. call sign). A photocell. dims all
display segments automatically.
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FAA APPROVED
Original
U.S. S16-5