S 865-022
(3)
Make sure these circuit breakers are closed:
(a)
On the miscellaneous equipment panel, P6:
1) 6L10, FUEL CONT VALVE ENG 1
2) 6L11, FUEL CONT VALVE ENG 2
3) 6L12, FUEL CONT VALVE ENG 3
4) 6L13, FUEL CONT VALVE ENG 4
S 715-016
(4)
Prepare the CDU for the test:
(a)
Push the MENU key on the CDU to show the MENU.
(b)
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU.
(c)
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.
(d)
Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu.
(e)
Push the NEXT PAGE key until you find <24 ELECTRICAL POWER.
(f)
Push the LSK that is adjacent to <24 ELECTRICAL POWER to show the GROUND TESTS menu for the electrical system.
(g)
Push the NEXT PAGE key until you find <EPGS (BCU1) or <EPGS (BCU2).
NOTE: If INHIBITED shows above <EPCS (BCU1) or <EPGS (BCU2)
____
the test will not operate.
1) Push the LSK that is adjacent to the test prompt.
2) Do the steps shown on the CDU.
3) Push the LSK that is adjacent to <RETURN to show the ground
test menu again.
E. EPGS Ground Test
S 945-043
(1)
Push the LSK that is adjacent to <EPGS (BCU1).
(2)
When IN PROGRESS goes out of view, stop for at least 20 seconds.
S 745-019
NOTE: If you do not stop for at least 20 seconds after
____ IN PROGRESS goes out of view, the test results will be incorrect.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
S 745-041
(3) Push the LSK that is adjacent to <EPGS (BCU2).
NOTE: IN PROGRESS shows during the test.
____
S 745-042
(4) When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <EPGS (BCU1) and <EPGS (BCU2).
NOTE: If two PASS indications show, no failures occurred during
____
the tests.
(a) If FAIL> shows adjacent to <EPGS (BCU1) or <EPGS (BCU2): 1) Push the LSK that is adjacent to FAIL> to see the GROUND
TEST MSG pages for the failure. 2) Push the NEXT PAGE key until you find all pages. 3) Make a list of all CMCS messages that show. 4) If there were two FAIL> indications, push the LSK that is
adjacent to <RETURN and repeat the previous steps for the other FAIL> indication. 5) Go to the CMCS Message Index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.
S 865-018
(5)
Put the Airplane in its Usual Condition.
(a)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 24-23-01-715-001
3. Power-Up Replacement Test (PURT) - Generator and Bus Control Units
__________________________________________________________________
A. General
(1)
The power-up replacement test (PURT) is almost the same as the ground self-test. However, the PURT does not do a test of the non-volatile memory (NVM) in the BCUs and GCUs.
B.
References
(1)
FIM 24-Fault Code Index
(2)
AMM 24-22-00/201, Manual Control
(3)
WDM 24-21-11 thru WDM 24-21-71, WDM 24-22-11 thru WDM 24-22-74, WDM 24-23-11 thru WDM 24-23-82, WDM 24-27-21 thru WDM 24-27-52
(4)
SSM 24-21-01 thru SSM 24-21-06, SSM 24-22-01 thru SSM 24-22-07, SSM 24-23-01 thru SSM 24-23-09, SSM 24-27-01 thru SSM 24-27-08
C.
Access
(1)
Location Zone
221 Control Cabin, LH
222 Control Cabin, RH
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 ELECTRICAL POWER 电源 2(21)
