~.............................................................................. | MM | | IPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Packing | 28-11-04 | 01 | 15,35| | | 2 | Packing | | | 25 | | | 3 | Primary Poppet | 28-11-04 | 01 | 20 | | | 4 | Poppet Seat | | | 30 | 2......…........…...................................…..........….....….........1
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747-400
MAINTENANCE MANUAL

SURGE TANK SUMP DRAIN SEE A
NO. 3 RESERVE TANK SUMP DRAIN NO. 4 MAIN TANK SUMP DRAIN
SEE B
SEE B
SURGE TANK SUMP DRAIN
SEE A
NO. 3 MAIN TANK SUMP DRAIN
SEE A
NO. 2 MAIN TANK  NO. 2 RESERVE TANK 
SUMP DRAIN  SUMP DRAIN 
CENTER WING  SEE  A  NO. 1 MAIN TANK  SEE  B 
TANK SUMP DRAIN  SUMP DRAIN 
SEE  A  SEE  B 
(CONNECTED TO 
FUEL SUMP  DRAIN LINE) 
DRAIN VALVE  FUEL SUMP 
DRAIN VALVE 

LOWER WING OR LOWER WINGSTABILIZER SKIN OR BODY SKIN
2.
 PACKING

3.
 PRIMARY POPPET  3. PRIMARY POPPET

2. PACKING
4.
 POPPET SEAT

4. POPPET SEAT
1. PACKING 1. PACKING
SUMP DRAIN SUMP DRAIN (EXAMPLE) (EXAMPLE)
A B
Fuel Sump Drain Valve Primary Poppet Installation Figure 401
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MAINTENANCE MANUAL

 D. Access
 (1)  
Location Zones 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 Panels
 191GL Fuel Drain and Dripstick Access Door
 192GR Fuel Drain and Dripstick Access Door

 E.
Procedure

 S 114-020
 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (1)  
Clean the base and poppet seat (4) with solvent, Series 82
 (AMM 20-30-82/201) to remove all lubricant.

 S 434-007

 (2)  
Install the new packing (1) on the poppet seat (4).

 S 434-008

 (3)  
Install the new packing (2) on the primary poppet (3).

 (4)  
Assemble the poppet (3) in the poppet seat (4).

 S 644-010

 (5)  
Apply a thin layer of antiseize compound to the external threads of poppet seat (4).

 S 434-009
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 S 644-018
 (6)  Apply a thin layer of antiseize compound to the internal threads of
 the fuel sump drain valve.
 S 424-011
 (7)  For all the fuel sump drain valve locations except the No. 2 or
　
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