(5)  
Self-Test The self-test exercise in the transponder is based on the high probability that the entire unit is operational if it is capable of receiving a low-level signal and generating a reply signal. Depressing the self-test switch causes a signal to be generated by the self-test oscillator. (One self-test switch is located on the control unit and one on the front panel of the transponder). The self-test signal is injected into the pre-selector. From this point it is processed as a valid interrogation signal. If no fault exists, a reply is generated; and the reply lights are energized after 8 valid replies, as if a valid interrogation signal had been received and processed.

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5C1 
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EFFECTIVITY
GJ ALL EXCPET B2504, B2505,B2509 AND B2510

K83185
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EFFECTIVITY

K83171
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EFFECTIVITY

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ATC SYSTEM - TROUBLE SHOOTING
EFFECTIVITY
GJ ALL EXCEPT B-2524

1. General
A.  The following trouble shooting procedures are based on performance of the operational and system tests and are presented in tree-type format.
B.  When a test step does not check out, follow the connecting line to the box containing the trouble symptom. Continue to follow a single line by analyzing the results of each test step until the required corrective action is determined. Perform the specified corrective action, then repeat the step at which the failure was encountered. When all steps in a path check out, the system is operable.
C.  All trouble shooting procedures are based on the assumption that wiring is OK and that electrical power is available. If the corrective action in the procedure does not correct the problem, check wiring using the wiring diagram.
D.  The trouble shooting procedures are for either ATC system No. 1 or ATC system No. 2 (if installed).
2.  Prepare for Trouble Shooting
A.  Provide electrical power.
B.  Check that required ATC, interphone and air data system circuit breakers on P18 panel are closed.
C.  Select transponder to be tested.
NOTE: Allow at least 1-minute warmup.
D.  Perform operational or system test (34-53-0/501) to isolate malfunction.
5C8
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ATC SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
GJ ALL EXCEPT B-2524

1. General
A.  The ATC system adjustment/test procedure consists of an operational test (par. 2), and three system tests (par. 3, 4 and 5). The operational test is intended to be used without test equipment for a relatively quick check of the operational status of the system.
B.  The system test may be performed using The Collins 476X-3 (par. 3), The Tel-Instrument Electronics Corp. T-33B (par. 4), or Instrument Flight Research ATC - 600A (par. 5) ramp test sets.
2.  Operational Test - ATC System
A.  General
(1)  The following paragraph provides a step-by-step operational test procedure for the ATC system. The operational test is a fast, preflight checkout to determine that the system is operating properly and requires only the use of the built-in test features of the equipment installed in the airplane.
　
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