(5)
AMM 28-11-02/401, Reserve and Main Tank Access Door

 B.  
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
 545CB 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

 C.  
Procedure

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-19
 ALL  ú ú 01 Page 401 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 494-002

 WARNING:_______ USE THE TAIL SUPPORT EQUIPMENT IF YOU CANNOT KEEP THE CENTER OF
 GRAVITY IN THE LIMITS GIVEN BY THE WEIGHT AND BALANCE MANUAL.
 IF THE AIRPLANE CENTER OF GRAVITY IS NOT IN THESE LIMITS, THE
 AFT END OF THE AIRPLANE CAN HIT THE GROUND.  DAMAGE TO

 EQUIPMENT AND INJURY TO PERSONS CAN OCCUR.
 (1)  
Install the tail support equipment if you cannot keep the airplane center of gravity in the limits given in the weight and balance manual (AMM 07-11-08/201).

 S 654-031

 (2)  
Defuel the applicable fuel tank (AMM 28-26-00/201).

 S 864-005
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
 (3)  
Purge and go into the fuel tank (AMM 28-11-00/201).

 S 014-006

 (4)  
Remove the applicable fuel tank access door for access to the boost pump discharge check valve (AMM 28-11-02/401) and go into the fuel tank.

 (a)  
For the main tank boost pump discharge check valve in the No. 1 or No. 4 main tank forward and aft boost pumps, remove the fuel tank access door, 545BB or 645BB.

 (b)  
For the main tank boost discharge check valve in the No. 2 or No. 3 main forward and aft boost pumps, remove the fuel tank access door, 544AB or 644AB.

 S 024-033
 (5)  
Remove the ejector pump pressure line (12) from the discharge check valve (1).

 (a)  
Discard the packing (13).

 S 034-007
 (6)  
Remove the bolts (16), washers (17), and nuts (18) that attach the discharge check valve (1) to the discharge line (3).

 (a)  
Discard the packing (2).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-19
 ALL  ú ú 01 Page 402 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 024-034
 (7)  
Removed the pressure sensor line (4) from the discharge check valve (1).

 (a)  
Discard the packing (5).

 S 034-009
 (8)  
Remove the bolts (9), washers (10), and the nuts (11) (4 locations) that attach the discharge check valve (1) to the main tank boost pump housing (8).

 (a)  
Discard the packing (15).

 S 024-012
 (9)  Remove the discharge check valve (1) and packing (2, 5, 13, 15) from the fuel tank.
 TASK 28-22-19-404-013
 3.  Discharge Check Valve Installation (Fig. 401)__________________________________
 A. Consumable Materials
 (1)  
D00128 Petrolatum - Technical, VV-P-236

 B.
References

 (1)  
AMM 07-11-08/201, Cargo and Fuel Loading Support

 (2)  
AMM 12-11-01/301, Fuel Servicing

 (3)  
AMM 28-00-00/201, Fuel System

 (4)  
AMM 28-11-00/201, Fuel Tanks
　
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