R **ON A/C 401-499,
R R R A. If the test confirms the fault: - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM TASK 24-41-34-400-001).
R **ON A/C ALL
B. Do this test to make sure that the system operates correctly:
(1) Do the test given in Para. 3. and make sure that: - on the panel 108VU, the EXT PWR/NOT IN USE indicator light and EXT PWR/ AVAIL caution light come on. - on the ELEC panel 35VU, the AVAIL legend of the EXT PWR pushbutton switch comes on.
(2) De-energize the aircraft electrical circuits from the external power (Ref. AMM TASK 24-41-00-862-002).
AC EXTERNAL POWER CONTROL (GPCU OR GAPCU) - FAULT ISOLATION PROCEDURES
______________________________________________________________________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
TASK 24-41-00-810-801
Failure of the Ground Power Control Unit
1. Possible Causes
_______________
- GPCU (1XG)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-41-00-740-002 Operational Test of the Ground power Control Unit
(GPCU) AMM 24-41-34-000-001 Removal of the Ground Power Control Unit (GPCU) (1XG) AMM 24-41-34-400-001 Installation of the Ground Power Control Unit (GPCU)
(1XG)
3. Fault Confirmation
__________________
A. Test Do the operational test of the GPCU (Ref. AMM TASK 24-41-00-740-002).
4. Fault Isolation
_______________
A. If the test gives the maintenance message GPCU:
- replace the GPCU (1XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM TASK 24-41-34-400-001).
B. Do the test given in Para. 3.A.
TASK 24-41-00-810-802
Failure of the Connection between the GPCU and the APU GCU
1. Possible Causes
_______________
- GPCU (1XG)
- GCU-APU (1XS)
- wiring
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 24-23-34-000-001 Removal of the GCU-APU (1XS)
AMM 24-23-34-400-001 Installation of the GCU-APU (1XS)
AMM 24-41-00-740-002 Operational Test of the Ground power Control Unit
(GPCU) AMM 24-41-34-000-001 Removal of the Ground Power Control Unit (GPCU) (1XG) AMM 24-41-34-400-001 Installation of the Ground Power Control Unit (GPCU)
(1XG)
ASM 24-41/02
3. Fault Confirmation
__________________
A. Test Do the operational test of the GPCU (Ref. AMM TASK 24-41-00-740-002).
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