ATC - Transponder 
R  Figure 005C 
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 ATC Transponder - Simplified Block Diagram
 Figure 006

R 1EFF : 001-049, 101-105, 151-199, 1 34-52-00Page 29 1 1 May 01/05 1 1 1CES 1R ATC Transponder - Simplified Block Diagram R Figure 006A

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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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