28-22-18
 ALL  ú ú 01 Page 403 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C. Access
 (1)  
Location Zones 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right

 (2)  
Access Panels
 544AB Fuel Tank Access Door
 545BB Fuel Tank Access Door
 545CD Boost Pump Access Door
 545DB Boost Pump Access Door
 644AB Fuel Tank Access Door
 645BB Fuel Tank Access Door
 645CB Boost Pump Access Door
 645DB Boost Pump Access Door

 D.
Procedure

 S 434-010
 (1)  
Install a new packings, (12) lubricated with petrolatum grease, on the removal check valve.

 S 424-011

 (2)  
Put the removal check valve (8) in its position on the main tank boost pump housing (11).

 S 434-012

 (3)  
Install the bolts (2), washers (1,14), and nuts (13) (6 locations) that attach the removal check valve to the main tank boost pump housing (11).

 S 424-018

 (4)  
Install a new packing (7) in the coupling (15), lubricated with petrolatum grease, on the pump inlet line (6).

 (5)  
Connect the coupling (15) to the removal check valve (8).

 S 864-021
 NOTE: If the bonding jumpers on the line were disconnected or
____ removed, make sure that the bonding surfaces on the lines are clean and install the bonding jumpers.
 S 864-013
 (6)  Go out of and close the fuel tank (AMM 28-11-02/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-18
 ALL  ú ú 01 Page 404 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (7)  S 654-014Refuel the applicable fuel tank (AMM 12-11-01/301).
 (8)  S 014-015Remove the motor/impeller unit from the main tank boost pump (AMM 28-22-03/401).
 (9)  S 794-016Do a check for leaks on the main tank boost pump removal check valve.
 S 414-017

 (10)
 Install the motor/impeller unit in the main tank boost pump (AMM 28-22-03/401).

 S 414-022

 (11)
 Install boost pump access doors, if removed.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-18
 ALL  ú ú 01 Page 405 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 MAIN TANK BOOST PUMP DISCHARGE CHECK VALVE - REMOVAL/INSTALLATION
_________________________________________________________________
 1.  General_______
 A.  This procedure contains instructions to remove and install the discharge check valve for the main tank boost pumps.
 B.  A discharge check valve is installed in each main tank boost pump housing, found in the inboard main and the outboard main tanks. The check valve is a spring-loaded poppet mounted in an aluminum alloy body type valve located in the discharge tube.
 C.  Access to the discharge check valves is through the applicable fuel tank access doors in the inboard and outboard main tank.
 TASK 28-22-19-004-001
 2.  Discharge Check Valve Removal (Fig. 401)_____________________________
 A.  References
 (1)
AMM 07-11-08/201, Cargo and Fuel Loading Support

 (2)
AMM 28-11-00/201, Fuel Tanks

 (3)
AMM 28-26-00/201, Defueling

 (4)
AIPC 28-22-54 Fig. 1
　
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