NOTE : As the GEN 1 was set to OFF because of a true failure, the fault
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confirmation is not necessary.
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4. Fault Isolation
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A. If the fault symptom is identified by the CFDS message CHECK GLC 1 AND/OR CONTROL CKT and the upper ECAM DU warning GEN 1 FAULT:
- do a check of the status of the GCU 1 circuit breaker.
(1) If the circuit breaker is open:
- refer to (Ref. TASK 24-20-00-810-804).
(2) If the circuit breaker is closed:
- do a check of the wiring for open circuit: . from the GCU1 pin B/2D to the pin A/D2 of the GLC1 AUX CTL relay, then the EGIU1 pin A/12A, then the GCU1 pin A/5B (the ELEC/GEN1 pushbutton switch must be pushed), . from the GCU1 pin A/12D to the EGIU1 pin A/13A, . from the GCU1 pin A/12C to the pin A/X1 of the GLC1 AUX CTL relay (the ELEC/GEN1 pushbutton switch must be pushed), . from the pin D1 of the GLC1 AUX CTL relay to the GLC1 pin B/3, . from the pin A/X2 of the GLC1 AUX CTL relay to the ground (Ref. ASM 24-22/02), . from the GLC1 pin B/5 to the ground (Ref. ASM 24-22/02).
(3) If there is no continuity:
- repair the above defective wiring.
(4) If there is continuity:
- do a check of the EGIU 1 wiring for open circuit from pin A/12A to pin A/13A.
(a) If there is no continuity:
- replace the EGIU-1 (Ref. AMM TASK 24-22-33-000-001) and (Ref. AMM TASK 24-22-33-400-002).
(b) If there is continuity:
- replace the GLC-1 (9XU1) (Ref. AMM TASK 24-22-55-000-001) and (Ref. AMM TASK 24-22-55-400-002).
(c) If the fault continues:
- replace the RELAY-GLC 1 AUX CTL.
(d) If the fault continues:
- replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001) and (Ref. AMM TASK 24-22-34-400-001).
B. Do this operational test to make sure that the system operates correctly.
(1) Aircraft Maintenance Configuration
(a) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
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(b) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).
(2) On the ELEC panel 35VU:
- push, release and push again the GEN 1 pushbutton switch (3XU1).
(3) Do the operational test of the GPCU (Ref. AMM TASK 24-41-00-740-002).
(4) Start the engine 1 (Ref. AMM TASK 71-00-00-710-003).
C. Do this test:
-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
On the ECAM control panel: On the lower ECAM display unit:
- get the ELEC page. - the correct electrical parameters of GEN 1 are shown and AC 1 busbar is supplied by GEN 1.
5. Close-up
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A. Put the aircraft back to its initial configuration.
(1) Stop the engine 1 (Ref. AMM TASK 71-00-00-710-028).
(2) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
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TASK 24-20-00-810-824
Loss of the GEN 1 (Failure of the GLC 1)
1. Possible Causes
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- GLC-1 (9XU1)
- GCU-1 (1XU1) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 电源 1(118)
