R 4. Fault Isolation
_______________

R  A. If the fault symptom is identified by the CFDS message CTA (51XU2)/ IDG2 
R  (E2-4000XU)/ GCU2 (1XU2) and the upper ECAM-DU warning GEN 2 FAULT: 
R  - read the EPGS GROUND REPORT or POST FLIGHT REPORT to see if there is 
R  one or two of the CFDS messages that follow: 
R  . IDG2 (E2-4000XU) LOW OIL PRESSURE 
R  . IDG2 (E2-4000XU) OIL OUT TEMP SENSE / GCU2 (1XU2) 
R  (1) If one or two of the CFDS messages are given: 
R  - replace the engine 2 IDG (4000XU) (Ref. AMM TASK 24-21-51-000-040) 
R  and (Ref. AMM TASK 24-21-51-400-040). 
R  (2) If these CFDS messages are not given: 
R  - do a check of the resistance of the Current Transformer (CT) 
R  (51XU2) (Ref. ASM 24-22/01) between: 
R  . pins 1 and 4 (10.15 ohms plus or minus 3.45 ohms) 
R  . pins 2 and 4 (10.15 ohms plus or minus 3.45 ohms) 
R  . pins 3 and 4 (10.15 ohms plus or minus 3.45 ohms). 
R  (a) If the resistance values are out of the specified limits: 
R  - replace the CT (51XU2) (Ref. AMM TASK 24-22-17-000-001) and 
R  (Ref. AMM TASK 24-22-17-400-001). 
R  (b) If the resistance values are in the specified limits: 
R  - do a check of the wiring (Ref. ASM 24-22/01) for a short to 
R  ground, a short circuit or an open circuit between: 
R  . pin 1 of the CT and pin A/12B of the GCU 2 
R  . pin 2 of the CT and pin A/12A of the GCU 2 
R  . pin 3 of the CT and pin A/11A of the GCU 2 
R  . pin 4 of the CT and pin A/11B of the GCU 2. 
R  1 If the wiring is not correct:_ 
R  - repair or replace as necessary. 
R  2 If the wiring is correct:_ 
R  - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001) 
R  and (Ref. AMM TASK 24-22-34-400-001). 
R  B. Do this operational test to make sure that the system operates correctly. 
R  (1) Aircraft Maintenance Configuration 
R  (a) Energize the aircraft electrical circuits 
R  (Ref. AMM TASK 24-41-00-861-002). 
R  (b) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) 
R  (Ref. AMM TASK 31-60-00-860-001). 
R  (2) On the ELEC panel 35VU: 
R  - push, release and push again the GEN 2 pushbutton switch (3XU2).

 「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 : 401-499, ∞∞24-22-00∞∞∞∞∞∞∞∞∞∞Page 261
 Aug 01/05 CES

R  (3) Do the operational test of the GAPCU (Ref. AMM TASK 24-41-00-740-
R  002). 
R  (4) Start the engine 2 (Ref. AMM TASK 71-00-00-710-003). 
R  (5) Do this test: 
R  -------------------------------------------------------------------------------
R  ACTION  RESULT 
R  -------------------------------------------------------------------------------
R  On the ECAM control panel:  On the lower ECAM DU: 
R  - get the ELEC page.  - the correct electrical parameters of 
R  the GEN 2 are shown and the AC2 
R  busbar is supplied by the GEN 2. 
R  5. Close-up________ 
R  A. Put the aircraft back to its initial configuration. 
R  (1) Stop the engine 2 (Ref. AMM TASK 71-00-00-710-028). 
R  (2) Do the EIS stop procedure 
R  (Ref. AMM TASK 31-60-00-860-002). 
R  (3) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY 
R  potentiometers to OFF. 
R  (4) De-energize the aircraft electrical circuits 
R  (Ref. AMM TASK 24-41-00-862-002).

R TASK 24-22-00-810-821

R  Failure of the Generator Control Unit 1 
R  1. Possible Causes_______________ 
R  - GCU-1 (1XU1) 
R  2. Job Set-up Information______________________ 
R  A. Referenced Information 
R  -------------------------------------------------------------------------------
R  REFERENCE  DESIGNATION 
R  -------------------------------------------------------------------------------
R  AMM  24-22-34-000-001  Removal of the GCU-1(2) (1XU1, 1XU2) 
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 電源 2(152)