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2. LOCATION (Figure 1)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
A56 transponder 1 251C / 34-50-00
E36 transponder antenna 1 210 215 34-53-03
Circuit breaker : - CB 90 "XPDR" 1 PL1 / WM
Fuses :
- Fl and F2 2 U15 / WM
3. DESCRIPTION
A. A56 transponder (Figure 2)
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.
On the front panel, mode and code selection are performed by the rotary knobs.
The front face of A56 transponder features :
- a function selector knob (3) for equipment energization and selection of the different operation modes : . "OFF" position : The transponder is de-energized.
. "SBY" position : The A56 transponder is energized but is inhibited from replying to any ground interrogation.
AGAF
Validity : GTX 320 34-53-00Page 1
(BQ) NOV 01
Transponder - Identification and location of components
Figure 1
AGAF
Validity : GTX 320 Page 2
34-53-00 (B., NOV 01
. "ON" position During normal operation, the transponder retransmits the identification code
displayed on the front panel of the equipment.
. "ALT" position : The transponder retransmits the identification code and the aircraft altitude
(mode C).
. "TST" position : Unstable position that must be held momentarily during the test. It enables the pilot to check the indicator light.
- an indicator light (2) that illuminates each time the transponder sends a response to the ground station interrogations.
- four knobs (4) are provided to separately select each digit of the identification code.
- an "I DENT" pushbutton (1) used to transmit a special identification pulse to help the radar operator.
A56 transponder receives a coded interrogation transmitted by the air traffic control ground radar station on a 1030-MHz carrier. A56 transponder decodes and processes the interrogations and sends a coded response on a 1090-MHz carrier.
A56 transponder is electrically supplied by "BUS 1" and/or "BUS 2" bars via a diode and a fuse respectively. The transponder is protected by CB 90 "XPDR" circuit breaker.
A56 transponder is mounted on PL30 radio rack. B. E36 transponder antenna
Transponder antenna allows signal reception and transmission within the L band (frequency within 950 and 1260 MHz).
Transponder antenna is mounted under the fuselage on the cowling under hull. 4. OPERATION (Figure 3)
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本文链接地址：TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 2(22)
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