ATC - Transponder
R Figure 005C
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ATC Transponder - Simplified Block Diagram
Figure 006
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ATC Transponder - Simplified Block Diagram
Figure 006B
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R **ON A/C 201-210,
R A. ATC Transponder
R (1) External description
R (Ref. Fig. 005C)
R The face of the transponder is fitted with a handle, two attaching
R parts, a TEST pushbutton switch and five LEDs.
R The name, color and function of the five LEDs are as follows:
R - LRU STATUS (green) indicates that no faults are detected during the
R BITE self-test
R - LRU STATUS (red) indicates that a fault(s) is detected during the
R BITE self-test
R - ANTENNA TOP FAIL (red) indicates that the upper antennas are
R incorrectly connected or are failed (comes on during BITE
R self-test)
R - ANTENNA BOT FAIL (red) indicates that the lower antennas are
R incorrectly connected or are failed (comes on during BITE
R self-test)
R - ALTITUDE FAIL (red) indicates that the altitude data is not in
R correct format or that the internal data receiver circuit is faulty
R (comes on during BITE self-test)
R - CONTROL FAIL (red) indicates that the control input is not in
R correct format or that the internal data receiver circuit is faulty
R (comes on during BITE self-test).
R The back of the transponder contains an ARINC 600, shell size
R connector to provide electrical connections to the aircraft wiring
R via mount.
R Contact grouping is as follows :
R - Top contact set - ATE interface
R - Center contact set - System interconnections
R - Bottom contact set - Power supply and bonding.
R (2) Not Applicable
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R **ON A/C 211-220,
R A. ATC Transponder
R (1) External description
R (Ref. Fig. 005B)
R The face of the transponder is fitted with a handle, two attaching
R parts, a TEST pushbutton switch and five indicator lights.
R These indicator lights are active for thirty-six seconds following a
R commanded self-test. During the active period, they operate in the
R following sequence:
R - all indicator lights are on red for 2 seconds,
R - the LRU STATUS indicator light is on green and all other indicator
R lights remain on red for 2 seconds.
R - all indicator lights are off for 2 seconds,
R - for the remainder of the active period, the LRU STATUS indicator
R light is on green if no LRU failure has been detected. If a LRU
R failure is found, the LRU STATUS indicator light comes on red. One
R of the other ANTENNA TOP FAIL, ANTENNA BOT FAIL, ALTITUDE FAIL, or
R CONTROL FAIL indicator lights can come on red when the associated
R fault condition is detected.
R (2) Not Applicable
R **ON A/C 001-049, 101-105, 151-199,
(3) Principle of operation
(Ref. Fig. 003)
Each ground interrogator transmits its interrogations at the
frequency of 1030 MHz in the form of a series of two pulses.
Depending on the pulse intervals and numbers, they define three
different interrogation modes. After receiving these pulses, the
TRA-67A transponder identifies and decodes the interrogations.
Depending on the detected interrogation mode, the TRA-67A transponder
transmits either the identification of the aircraft or its barometric
altitude or flight data.
To perform these functions, the transponder is associated with a
control unit defining the aircraft identification code, the Air
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