S 864-019
(3)
If you opened these circuit breakers, remove the DO-NOT-CLOSE tags and close these circuit breakers.
(a)
On the P180 or P180-1 panel:
1) C8 or M4, GCU 1
2) B25, GCU 1 ALT
(b)
On the P514 panel:
1) GCU 1 PHASE C SYNCH BUS
S 864-022
(4)
If you opened these circuit breakers, remove the DO-NOT-CLOSE tags and close these circuit breakers.
(a)
On the P180 or P180-1 panel:
1) C9 or M5, GCU 2
2) B26, GCU 2 ALT
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747-400 MAINTENANCE MANUAL
(b) On the P614 panel:
1) GCU 2 PHASE C SYNCH BUS
S 864-020
(5)
If you opened these circuit breakers, remove the DO-NOT-CLOSE tags and close these circuit breakers.
(a)
On the P180 or P180-1 panel:
1) C10 or M6, GCU 3
2) B27, GCU 3 ALT
(b)
On the P515 panel:
1) GCU 3 PHASE C SYNCH BUS
S 864-021
(6)
If you opened these circuit breakers, remove the DO-NOT-CLOSE tags and close these circuit breakers.
(a)
On the P180 or P180-1 panel:
1) C11 or M7, GCU 4
2) B28, GCU 4 ALT
(b)
On the P615 panel:
1) GCU 4 PHASE C SYNCH BUS
S 864-013
(7) Do this task "Ground Test - Generator and Bus Control Units" (AMM 24-23-01/501).
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747-400 MAINTENANCE MANUAL
GENERATOR AND BUS CONTROL UNITS - ADJUSTMENT/TEST
_________________________________________________
1. General_______
A. This procedure has two tasks. One task is the ground self-test (GST) for the BCUs and the GCUs. The other task is the power-up replacement test (PURT) for the BCUs and the GCUs.
B. You use the CMC to start each test.
TASK 24-23-01-745-006
2. Ground Test - Generator and Bus Control Units_____________________________________________
A. General
(1)
The CMC sends a ground test command to the two BCUs and the four GCUs (through the BCUs) to start a test of all internal circuits and non-volatile memory. If the internal circuit of a unit does not operate correctly, the unit sends a failure indication to the CMC through the EIUs, which causes a CMCS message such as GCU-X FAIL or BCU-X FAIL. The test result is FAIL if one of the above CMCS message occurs, or if a failure related to the electrical power system is active before, during, or immediately after the ground test.
(2)
The EPGS (BCU1) ground test looks for faults that are related to BCU-1, GCU-1, and GCU-2. The EPGS (BCU2) ground test looks for faults that are related to BCU-2, GCU-3, and GCU-4.
B.
References
(1)
AMM 24-22-00/201, Manual Control
C.
Access
(1)
Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
D.
Prepare for the Test
S 865-007
(1)
Supply electrical power with external power #1 or APU generator power #1 (AMM 24-22-00/201).
(2)
Make sure that all engines are off.
S 865-020
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