(2) Do the operational test of the CVR and the CVR channel recording (Ref. AMM TASK 23-71-00-710-001) only if the fault causes inhibition of the audio signal related to the CVR.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞31-53-00∞∞∞∞∞∞∞∞∞∞Page A248
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(3) Do the operational test of the GPWS ground self-test function (Ref. AMM TASK 34-48-00-710-001) only if the fault causes inhibition of the audio signal related to the GPWS.
(4) Do the BITE test of the TCAS (Ref. AMM TASK 34-43-00-740-001) only if the fault causes inhibition of the audio signal related to the TCAS.
4. Fault Isolation
_______________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU AUDIO MIXING 14WW K03 121VU EIS/F/O/LOUD/SPKR 4WW P08
B. If the fault causes inhibition of all the aural warnings:
- do a check of the status of the circuit breaker (4WW).
- do a check of the status of the circuit breaker (14WW).
(1) if the circuit breaker (14WW) is closed:
- do a check for 28VDC at pin A/L of the audio mixing box (15WW) (Ref. ASM 31-51/01):
(a) if there is 28VDC:
- replace the audio mixing box (15WW) (Ref. AMM TASK 31-53-33-000-001) and (Ref. AMM TASK 31-53-33-400-001).
(b) if there is no 28VDC:
- do a check for 28VDC at the circuit breaker (14WW):
1 if there is 28VDC:
_
- do a check and repair the wiring from the circuit breaker (14WW) to the audio mixing box (15WW).
2 if there is no 28VDC:
_
- replace AUDIO MIXING (14WW).
(2) if the circuit breaker (14WW) is open:
- close the circuit breaker (14WW).
(a) if the circuit breaker trips:
- replace the AUDIO MIXING (14WW).
1 if the circuit breaker trips again
_
- replace the audio mixing box (15WW) (Ref. AMM TASK 31-53-33-000-001) and (Ref. AMM TASK 31-53-33-400-001).
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(3) If the circuit breaker (4WW) is closed:
- do a check for 28VDC at pin A/A of the loud speaker (7WW) (Ref. ASM 31-51/01).
(a) If there is 28VDC:
- do a check for a ground signal at pins A/B and A/T of the loud speaker (7WW).
1 If there is a ground signal:
_
- replace the LOUD SPEAKER-CAPT (7WW) (Ref. AMM TASK 31-53-21-000-001) and (Ref. AMM TASK 31-53-21-400-001).
a If the fault continues:
_
- replace the FWC-1 (1WW1) (Ref. AMM TASK 31-53-34-000-001) and (Ref. AMM TASK 31-53-34-400-001). . If the fault continues:
- replace the FWC-2 (1WW2) (Ref. AMM TASK 31-53-34-000-001) and (Ref. AMM TASK 31-53-34-400-001).
* If the fault continues:
- do a check and repair the wiring: ** of the AUDIO OUT signal from the FWC1 (1WW1) to the loud speaker (7WW) ** of the AUDIO OUT signal from the FWC2 (1WW2) to the loud speaker (7WW) (Ref. ASM 31-52/04).
2 If there is no ground signal:
_
- do a check and repair the wiring of pins A/B and A/T from the loud speaker (7WW) to the first terminal block (Ref. ASM 31-51/01).
(b) If there is no 28VDC:
- do a check for 28VDC at pin 2 of the circuit breaker (5WW) (Ref. ASM 31-51/01).
1 If there is 28VDC:
_
- do a check and repair the wiring from the circuit breaker (5WW) to the loud speaker (7WW) (Ref. ASM 31-51/01).
2 If there is no 28VDC:
_
- replace the C/B - CAPT/LOUD/SPKR (5WW).
(4) If the circuit breaker is open:
- close the circuit breaker.
(a) If the circuit breaker trips:
- replace the C/B - CAPT/LOUD/SPKR (5WW).
1 If the circuit breaker trips again:
_
- replace the LOUD SPEAKER-CAPT (7WW) (Ref. AMM TASK 31-53-21-000-001) and (Ref. AMM TASK 31-53-21-400-001).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞31-53-00∞∞∞∞∞∞∞∞∞∞Page A250
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