Vent Tube Inlet
Figure 402 (Sheet 1)

K27854
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A
747-400
MAINTENANCE MANUAL

VENT TUBE BONDING
INLET CLAMP

BRACKET SUPPORT DRAIN VALVE
A-A
Vent Tube Inlet
Figure 402 (Sheet 2)

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K27694
A
747-400 MAINTENANCE MANUAL
 WING SURGE TANK DRAIN CHECK VALVE - REMOVAL/INSTALLATION
________________________________________________________
 1.  General_______
 A.  This section supplies instructions for the removal and the installation of the check valve on the drain line.
 B.  The check valves are installed on the end of the drain lines in the surge tank. The check valves are found at the outboard rib of the inboard main tanks.
 C.  Access to the check valves is through the access doors 545BB and 645BB.
 TASK 28-13-04-004-001
 2.  Wing Surge Tank Drain Check Valve Removal (Fig. 401)_________________________________________
 A.  References
 (1)  
AMM 28-11-00/201, Fuel Tanks

 (2)  
AMM 28-26-00/201, Defueling

 (3)  
AIPC 28-13-01 Fig. 1

 B.  
Access

 (1)  
Location Zones 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right

 (2)  
Access Panels
 545BB Fuel Tank Access Door
 645BB Fuel Tank Access Door

 C.  
Procedure

 S 654-002
 (1) Defuel the applicable inboard main tank (AMM 28-26-00/201).
 S 864-003
 WARNING:_______OBEY ALL THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. IF YOU DO NOT OBEY THE PRECAUTIONS, YOU CAN CAUSE AN INJURY TO A PERSON AND YOU CAN CAUSE DAMAGE TO THE AIRPLANE.
 (2)  
Remove the fuel in the fuel tank and prepare to go into the fuel tank (AMM 28-11-00/201).

 S 024-004

 (3)  
Loosen the coupling and remove the check valve.

 (a)  
Discard the O-ring.

 TASK 28-13-04-404-005
 3.  Drain Check Valve in the Wing Surge Tank Installation (Fig./401)_____________________________________________________
 A.  Consumable Materials
 (1)  
D00128 Petrolatum - Technical, VV-P-236

 B.  
References

 (1)  
AMM 28-11-00/201, Fuel Tanks

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747-400
MAINTENANCE MANUAL

WING SURGE TANK DRAIN CHECK VALVE
SEE A
WING SURGE TANK DRAIN CHECK VALVE
SEE A
O-RING
CHECK VALVE
COUPLING
FWD
A
Wing Surge Tank Drain Check Valve Installation Figure 401
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747-400
MAINTENANCE MANUAL

 (2)  
AIPC 28-13-01, Fig. 1

 C.
Access

 (1)  
Location Zones 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right

 (2)  
Access Panels
　
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