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A56 transponder energization is obtained by means of "RADIO MASTER" switch.
When the function selector knob is set to "ON", the transponder replies to mode A identification interrogations. The identification code, entered into the transponder by means of the code selector knobs, is transmitted to the ground station.
When A56 transponder is operating in mode C (Function selector knob set to "ALT"), the altitude data provided by M76 encoding altimeter are transmitted to the ground station.
AGAF
Validity : GTX 320 34 53-00Page 3
(BQ) NOV 01
1 - "IDENT" pushbutton
2 - Indicator light
3 - Function selector knob
4 - Knob
A56
TRANSPONDEUR
TRANSPONDER
INTERROGATEUR
DME
DME
INTERROGATOR
ALTIMETRE CODEUR
oU
CODEUR ALTITUDE
ENCODING ALTIMETER
OR
ALTITUDE ENCODER
2A
_cc\ PANNEAU
FUSIBLES
FUSES PANEL
E36
ANTENNE
TRANSPONDEUR
XPDR ANTENNA
RELAIS GENERAL RADIO
RADIO MASTER RELAY
A56 transponder - Schematic
Figure 3
PAGE INTENTIONALLY LEFT BLANK
AGAF
Validity : GTX 320 Page 6
34-53-00 (Bo, NOV 01
TRANSPONDER
DESCRIPTION AND OPERATION
1. GENERAL
The transponder is an integral part of the Air Traffic Control Radar Beacon System (ATCRBS).
The transponder allows the operational air traffic service to identify the aircraft.
The system consists of :
- the A56 transponder,
- the E36 transponder antenna.
The transponder receives altitude information from the encoding altimeter - refer to 34-11-00.
A desensitization line connects A56 transponder to the DME installation - refer to 34-55-00.
The transponder is electrically supplied by "BUS 1" and/or "BUS 2" bars.
2. LOCATION (Figure 1)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
A56 transponder 1 251C or
254R / 34-50-00
E36 transponder antenna 1 210 215 34-53-03
Circuit breaker : - CB 90 "XPDR" 1 PL1 / WM
Fuses :
- F1 and F2 2 U15 / WM
3. DESCRIPTION
A. A56 transponder
A56 transponder transmits a coded response to an interrogation transmitted by an air traffic control ground
radar station. The coded response contains the aircraft identification code and altitude information.
A56 transponder is a rectangular box installed in a rack. Connections are made through an electrical connector and an antenna connector on the back panel.
The front face of A56 transponder features :
- a display that shows data such as identification code, operating mode and, depending on the selection, flight level, flight time or time measure function.
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