CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 9-37
SUPPLEMENT
CESSNA 400 TRANSPONDER (Type RT-459A) AND OPTIONAL ENCODING ALTIMETER (Type
EA-401A)
SECTION 1 – GENERAL
The Cessna 400 Transponder (Type 459A), show in Figure 1, is the airborne component of an Air Traffic
Control Radar Beacon System (ATCRBS). The transponder enables the ATC ground controller to “see”
and identify the aircraft, while in flight, on the control center’s radarscope more readily.
The 400 Transponder consists of a panel-mounted unit and an externally-mounted antenna. The
transponder receives interrogating pulse signals on 1030 MHz and transmits coded pulse-train reply
signals on 1090 MHz. It is capable of replying to Mode A (aircraft identification) and Mode C (altitude
reporting) interrogations on a selective reply basis on any of 4,096 information code selections. When
an optional panel mounted EA-401A Encoding Altimeter (not part of 400 Transponder System) is
included in the avionic configuration, the transponder can provide altitude reporting in 100-foot
increments between -1000 and +35,000 feet.
All Cessna 400 Transponder operating controls, with the exception of the optional altitude encoder’s
altimeter setting knob, are located on the front panel of the unit. The altimeter setting knob is located
on the encoding altimeter. Functions of the operating controls are described in Figure 1.
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