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A
747-400
MAINTENANCE MANUAL
(b) Apply these protective finishes to any bare areas of the front spar not covered with the sealant: 1) Alodine 600 (AMM 51-21-04/701). 2) BMS 10-20 Type II primer (AMM 28-11-00/801).
S 794-039
(8)
Do these steps to check for external fuel leaks at the jettison transfer valve:
(a)
Refuel the applicable main tank (AMM 12-11-01/301).
(b)
Do a check for leaks at the main tank jettison transfer valve.
G.
Jettison Valve Adapter Operational Tests
S 714-040
(1)
Do this task: Fuel Jettison Transfer Valve - Ground Test
(AMM 28-31-00/501).
S 714-041
(2)
Do this task: Fuel Jettison Transfer Valves - Fuel Transfer Operational Test (AMM 28-31-00/501).
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747-400 MAINTENANCE MANUAL
FUEL OVERRIDE/JETTISON PUMP FAULT CURRENT DETECTOR - REMOVAL/INSTALLATION
_________________________________________________________________________
1. General_______
A. This procedure contains instructions to remove and install the fault current detectors for the fuel override/jettison pumps.
B. The detectors are found in the electronics bay, installed on brackets between two main deck floor beams at stations 500 and 520, immediately aft of the power distribution centers P414 and P415. The six fault current detectors are the same and three are installed on each side of the airplane.
TASK 28-31-14-004-001
2. Fault Current Detector Removal (Fig. 401)______________________________
A. References
(1)
AIPC 28-31-60 Fig. 1
(2)
SSM 28-31-02, 28-31-04
(3)
WDM 28-31-21, WDM 28-31-22, WDM 28-31-23, WDM 28-31-24, WDM 28-31-25, WDM 28-31-26
B.
Access
(1)
Location Zones 117 Electrical & Electronics Compartment, Left 118 Electrical & Electronics Compartment, Right
C.
Procedure
S 864-002
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P180 DC Power Distribution Panel 1) 180E2, OVRD/JTSN PUMP CONT L CTR 2) 180E3, JTSN PUMP CONT 2&3 OTBD 3) 180E18, JTSN PUMP CONT 2&3 INBD 4) 180H18, OVRD/JTSN PUMP CONT R CTR
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747-400 MAINTENANCE MANUAL
S 034-003
(2) Disconnect the electrical connector from the fault current detector.
NOTE: Refer to this table for equipment numbers:
____
~................................................................. | | Equipment Number | | Location ............................ | | Detector | Connector | ................................................................... | No. 2 Main Tank - Inbd (Aft) | M7867 | DM7867 | | No. 2 Main Tank - Outbd (Fwd) | M7869 | DM7869 | | No. 3 Main Tank - Inbd (Aft) | M7866 | DM7866 | | No. 3 Main Tank - Outbd (Fwd) | M7868 | DM7868 | | Center Wing Tank - Left | M473 | DM473 | | Center Wing Tank - Right | M472 | DM472 | 2......................................…...........…..............1
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