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2. LOCATION (Figure 1)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
A56 transponder 1 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 (mode A) and altitude information (mode C). The transponder also transmits a response to general calls (All Call) of mode S.
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.
AIAI
Validity : GTX 330 34 53-00Page 1
(a) JUN 04
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.
- a set of pushbuttons for equipment energization and selection of the different operating modes : "OFF" pushbutton : The transponder is de-energized.
"STBY" pushbutton : A56 transponder is energized but is inhibited from replying to any ground interrogation.
. "ON" pushbutton : Used to select modes A and S. The transponder replies to interrogations of
modes A, C and S but the response does not contain altitude information.
. "ALT" pushbutton : Used to select modes A, C and S. The transponder replies to interrogations
of identification (mode A), altitude (mode C) and mode S.
- an "IDENT" pushbutton used to transmit a special identification pulse to help the radar operator.
- a "VFR" pushbutton used to recall a pre-programmed identification code into the transponder memory.
- eight pushbuttons identified from "0" to "7" are provided either to separately select each of the four digits
of the identification code or to enter figures from 0 to 7 to program the time measure function in counting-down mode.
- a "FUNC" pushbutton used to modify the modes displayed on the R.H. section of the display. Main
displayed data are flight level, flight time and time measure function (up-down counter).
- a "START/STOP" pushbutton used to start or stop the up-down counter of time measure function.
- a "CRSR" pushbutton used to activate/de-activate the cursor in order to select starting time of time
measure function in counting-down mode. It is also used to cancel the current selection of the identification code.
- a "CLR" pushbutton is used to reset the up-down counter of the time measure function. It is also used
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