R TASK 24-20-00-810-943

R  Failure of the Status Circuit of the APU GLC 
R  1. Possible Causes_______________ 
R  - GAPCU (24XG) 
R  - GLC-APU (3XS) 
R  - wiring 
R  2. Job Set-up Information______________________ 
R  A. Referenced Information 
R  -------------------------------------------------------------------------------
R  REFERENCE  DESIGNATION 
R  -------------------------------------------------------------------------------

R  AMM  24-23-55-000-001 
R  AMM  24-23-55-400-001 
R  AMM  24-41-00-740-002 
R  AMM  24-41-34-000-001 
R 
R  AMM  24-41-34-400-001 
R 
R  ASM  24-23/02 

R 3. Fault Confirmation
__________________ R A. Test
Removal of the APU GLC (3XS)
Installation of the APU GLC (3XS)
Operational Check of GAPCU via CFDS
Removal of the Ground Auxiliary Power Control Unit
(GAPCU) (24XG)
Installation of the Ground Auxiliary Power Control
Unit (GAPCU) (24XG)

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 - do the trouble shooting given in Para 4.B. 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 GAPCU (24XG) comes into view:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref.
R AMM TASK 24-41-34-400-001).

 「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 : 401-499, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page C248
 Aug 01/05 CES

R  B. If the BITE test gives the message TEST PASSED: 
R  - replace the GLC-APU (3XS) (Ref. AMM TASK 24-23-55-000-001) and (Ref. 
R  AMM TASK 24-23-55-400-001). 
R  (1) If the fault continues: 
R  - do a check of the wiring for a short to 28VDC between pin B/18 of 
R  the APU GLC contactor (3XS) and pin A/6A of the GAPCU (24XG) (Ref. 
R  ASM 24-23/02). 
R  (a) If the wiring is not correct: 
R  - repair or replace as necessary. 
R  (b) If the wiring is correct: 
R  - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and 
R  (Ref. AMM TASK 24-41-34-400-001). 
R  C. Do the test given in para. 3.

R  TASK 24-20-00-810-944 
R  APU Generator Overload 
R  1. Possible Causes_______________ 
R  - GAPCU (24XG) 
R  - wiring 
R  - feeders 
R  2. Job Set-up Information______________________ 
R  A. Referenced Information 
R  -------------------------------------------------------------------------------
R  REFERENCE  DESIGNATION 
R  -------------------------------------------------------------------------------

R  AMM  24-41-00-861-002 
R 
R  AMM  24-41-00-862-002 
R 
R  AMM  24-41-34-000-001 
R 
R  AMM  24-41-34-400-001 

R R 3. Fault Confirmation
__________________ R A. Test
Energize the Aircraft Electrical Circuits from the APU De-energize the Aircraft Electrical Circuits Supplied from the APU Removal of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) Installation of the Ground Auxiliary Power Control Unit (GAPCU) (24XG)
R NOTE : Make sure that the cause of the overload is not a load added to
____ R the normal load because then, the total load will be more than the R maximum permitted load. If this occurs, no trouble shooting is R necessary.
R (1) Energize the aircraft electrical circuits from the APU (Ref. AMM TASK R 24-41-00-861-002).
R (a) On the upper ECAM DU, the warning GEN APU OVERLOAD is shown and R the APU generator or the external power trips.
R 4. Fault Isolation
_______________
R A. If the test confirms the fault:
R - do a check of the circuit breakers related to the loads from the APU
R generator.

R (1) If the circuit breakers are open:
R - do a check and repair the wiring and the related equipment for a
R short circuit or a short to ground.
　
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