28-22-04
ALL ú ú 01 Page 404 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 284-024
(8) Measure the bonding resistance between the bonding jumper and tank structure (SWPM 20-20-00).
NOTE: The bonding resistance must not be more than 0.010 ohms.
____
S 434-017
CAUTION:_______DO NOT USE TOOLS TO TIGHTEN THE FUEL LINE FITTINGS. YOU COULD CAUSE DAMAGE TO THE FITTING COMPONENTS OR LOOSEN THE ADJACENT FITTINGS.
(9)
Tighten the coupling nuts with your hands on the crossfeed manifold tubes (AMM 28-00-00/201).
S 414-018
(10)
Install the spanwise beam access doors (AMM 28-11-09/401).
S 414-022
(11)
Do the close the center wing tank procedure (AMM 28-11-00/201).
(12)
Service the fuel tank (AMM 12-11-01/301).
S 654-019
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28-22-04
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
ENGINE FUEL SHUTOFF (SPAR) VALVE BODY - REMOVAL/INSTALLATION
____________________________________________________________
1. General
_______
A. The engine fuel shutoff valve body will be referred to as the engine spar valve body or valve body in this procedure.
B. This procedure contains instructions to remove and install the engine spar valves. One valve body is found in each main fuel tank, installed in the engine fuel-feed manifold.
C. AIRPLANES WITH PW OR RR ENGINES; The No. 1 and 4 engine spar valves are installed rotated 180 degrees compared to the No. 2 and 3 spar valves. This includes the valve body, valve adapter and actuator. For these valves, the TOP position markers on the valve body must face toward the bottom of the fuel tank. The index marks on the valve body must also face toward the bottom of the tank when the valve body is closed. The adapter plate is installed with the TOP position marker located on the bottom of the plate.
D. ENGINE SPAR VALVE - FUEL TRANSFER OPERATIONAL TEST; The engine spar valves have a dual function. One function is to shutoff the flow of fuel to the engine during engine shutdown. The second function is fire protection during an engine fire emergency. Because of the fire protection function, it is necessary to verify that the valve body is aligned correctly and does not leak. The Engine Spar Valve -Fuel Transfer Operational Test (AMM 28-22-00/501) must be accomplished after replacement of the valve body or valve adapter.
E. Access to the valve body is through the applicable fuel tank access door installed below the wing.
TASK 28-22-05-004-001
2. Engine Spar Valve Body Removal (Fig. 401)
______________________________
A. References
(1)
AMM 28-11-00/201, Fuel Tanks
(2)
AMM 28-11-02/401, Reserve and Main Tank Access Door
(3)
AMM 28-11-25/401, Mid Spar Access Doors
(4)
AMM 28-26-00/201, Defueling
(5)
AIPC 28-22-05 Fig. 1
B.
Access
(1)
Location Zones 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 551 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 651 Outbd Main Tank (Part), Front Spar to Mid Spar, Right
(2)
Access Panels
545BB Fuel Tank Access Door
552EB Fuel Tank Access Door
552FZ Mid Spar Access Door
645BB Fuel Tank Access Door
652EB Fuel Tank Access Door
652FZ Mid Spar Access Door
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28-22-05
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747-400 MAINTENANCE MANUAL
C. Procedure
S 654-002
(1) Defuel the applicable main fuel tank (AMM 28-26-00/201).
S 864-018
WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
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