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 FUEL SUMP DRAIN VALVE SECONDARY POPPET - REMOVAL/INSTALLATION
_____________________________________________________________
 1.  General_______
 A.  This section supplies instructions for the removal and installation of the secondary poppet in the sump drain valve.
 B.  The access to the secondary poppet installed in the main, the reserve, or the surge tank is through its applicable fuel tank access door. The access to the secondary poppet installed in the center wing tank is through the access door for the center wing tank and the spanwise beam access doors.
 TASK 28-11-07-004-001
 2.  Fuel Sump Drain Valve Secondary Poppet 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 28-11-04/401, Fuel Sump Drain Valve Primary Poppet

 (4)
AMM 28-11-09/401, Spanwise Beam Access Door

 (5)
AMM 28-26-00/201, Defueling

 (6)
AIPC 28-11-15 Fig. 2

 B.  
Access

 (1)  
Location Zone 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 555 Surge Tank, Front Spar to Rear Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 655 Surge Tank, Front Spar to Rear Spar, Right

 (2)  
Access Panel
 131AZ Spanwise Beam Access Door
 544AB Fuel Tank Access Door
 545BB Fuel Tank Access Door
 552DB Fuel Tank Access Door
 644AB Fuel Tank Access Door
 645BB Fuel Tank Access Door
 652DB Fuel Tank Access Door

 

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-07
 ALL  ú ú 04 Page 401 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 C. Procedure
 S 014-002
 (1)  
Remove the primary poppet from the drain valve in the fuel sump (AMM 28-11-04/401).

 S 654-003

 (2)  
Defuel the applicable fuel tank, if it is necessary
 (AMM 28-26-00/201).

 

 S 864-004
 WARNING:_______OBEY ALL THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. YOU CAN CAUSE AN INJURY TO A PERSON AND CAUSE DAMAGE TO THE AIRPLANE.
 (3)  
Remove the fuel from the surge tank and prepare it for an entry (AMM 28-11-00/201).

 S 014-005

 (4)  
If it is necessary, remove the other access doors to get access to the sump drain valve (AMM 28-11-02/401).

 NOTE: Refer to the table that follows for the access door numbers.
____
 ~.................................................................. | Tank | Access Door | .................................................................... | No. 1 Main Tank | 545BB | | No. 2 Main Tank | 544AB | | No. 3 Main Tank | 644AB | | No. 4 Main Tank | 645BB | | No. 2 Reserve Tank | 552DB | | No. 3 Reserve Tank | 652DB | | Center Wing Tank | 131EZ | | Wing Surge Tank - Left | 555AB | | Wing Surge Tank - Right | 655AB | 2.....................................…............................1
 S 864-006
 (5)  Go into the fuel tank (AMM 28-11-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-11-07
 ALL  ú ú 04 Page 402 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-007
 (6)  
If you must remove the secondary poppet from the valve in the center wing tank, remove the 131AZ access door in the No. 3 spanwise beam (AMM 28-11-09/401).

 S 034-008

 (7)  
For the drain valves with the drain line provisions, disconnect the drain line coupling from the fitting on the valve housing.

 S 034-009

 (8)  
On the drain valves with the drain line provisions, remove the fitting from the valve housing.
　
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