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R  operation between pin C/U and pin C/V (Ref. ASM 24-22/03). 
R  (1) If the contact operation is not correct: 
R  - replace the ENG/APU FIRE PNL (1WD) (Ref. AMM TASK 26-12-12-000-001) 
R  and (Ref. AMM TASK 26-12-12-400-001). 
R  (2) If the contact operation is correct: 
R  - do a check of the wiring for open circuit or short to ground 
R  between pin C/V of the ENG/APU FIRE panel and pin A/3J of the GCU 2 
R  (Ref. ASM 24-22/03). 
R  (a) If the wiring is not correct: 
R  - repair or replace as necessary. 
R  (b) If the wiring is correct: 
R  - replace the ENG/APU FIRE PNL (1WD) (Ref. AMM TASK 26-12-12-000-
R  001) and (Ref. AMM TASK 26-12-12-400-001). 
R  C. Do the test given in para. 3.

R TASK 24-20-00-810-868

R Failure of the GCU 1 R 1. Possible Causes
_______________
R - GCU-1 (1XU1)
R - IDG (4000XU)
R 2. Job Set-up Information

______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R AMM 24-21-51-000-040 R R AMM 24-21-51-400-040 R R AMM 24-22-34-000-001 R AMM 24-22-34-400-001 R AMM 24-41-00-740-002
R 3. Fault Confirmation
__________________
R A. Test
Removal of the Integrated Drive Generator -IDG
1(2),(4000XU)
Installation of the Integrated Drive Generator -IDG
1(2),(4000XU)
Removal of the GCU-1(2) (1XU1, 1XU2)
Installation of the GCU-1(2) (1XU1, 1XU2)
Operational Check of GAPCU via CFDS

R (1) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R (a) If the BITE test gives the message TEST FAILED: R - do the trouble shooting given in Para 4.A.
R (b) If the BITE test gives the message TEST PASSED: R - stop the trouble shooting.
R 4. Fault Isolation
_______________
R A. If the BITE test gives the message TEST FAILED:
R - push the line key adjacent to the TEST FAILED message.

R (1) If the maintenance message GCU1 (1XU1) comes into view associated
R with the fault code 121 (SRD FLD (+) FAIL keyword) or 188 (EX FLD (+)
R SENSE keyword):
R - replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001) and (Ref.
R AMM TASK 24-22-34-400-001).

R (a) If the fault continues:
R - replace the engine 1 IDG (4000XU) (Ref. AMM TASK 24-21-51-000-R 040) and (Ref. AMM TASK 24-21-51-400-040).

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 401-499, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page A263
 Aug 01/05 CES

R  (2) If the maintenance message GCU1 (1XU1) comes into view associated 
R  with other fault codes: 
R  - replace the GCU-1 (1XU1) (Ref. AMM TASK 24-22-34-000-001) and (Ref. 
R  AMM TASK 24-22-34-400-001). 
R  B. Do the test given in para. 3.

R TASK 24-20-00-810-869

R Failure of the GCU 2 R 1. Possible Causes
_______________
R - GCU-2 (1XU2)
R - IDG (4000XU)
R 2. Job Set-up Information

______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R AMM 24-21-51-000-040 R R AMM 24-21-51-400-040 R R AMM 24-22-34-000-001 R AMM 24-22-34-400-001 R AMM 24-41-00-740-002
R 3. Fault Confirmation
__________________
R A. Test
Removal of the Integrated Drive Generator -IDG
1(2),(4000XU)
Installation of the Integrated Drive Generator -IDG
1(2),(4000XU)
Removal of the GCU-1(2) (1XU1, 1XU2)
Installation of the GCU-1(2) (1XU1, 1XU2)
Operational Check of GAPCU via CFDS

R (1) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R (a) If the BITE test gives the message TEST FAILED: R - do the trouble shooting given in Para 4.A.
R (b) If the BITE test gives the message TEST PASSED: R - stop the trouble shooting.
R 4. Fault Isolation
_______________
R A. If the BITE test gives the message TEST FAILED:
R - push the line key adjacent to the TEST FAILED message.

R (1) If the maintenance message GCU2 (1XU2) comes into view associated
R with the fault code 121 (SRD FLD (+) FAIL keyword) or 188 (EX FLD (+)
R SENSE keyword):
R - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001) and (Ref.
　
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