Cessna 172SPHUSR05 Pilot Operating Handbook page 286

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SECTION 9 SUPPLEMENTS
SUPPLEMENT 2
A VFR programming sequence, described in Section 4, allows
the pilot to preprogram any single code such as " 1200" into the KT
76C. Pressing the VFR button instantly returns the KT 76C to the
preprogrammed code without having to manually enter 11120011.
All Bendix/King Transponder operating controls are located on
the front panel of the unit.
described in Figure
82-4
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FAA APPROVED
Functions of the operating controls are
1.
CESSNA
MODEL 172S
Jul 8/98