S 683-053

 (10)
 Make sure the final sample of fuel from the sump drain is clear and bright.

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747-400 MAINTENANCE MANUAL
 S 683-054
 (11)
 Use correct procedures to dispose of the fuel.

 S 683-055

 (12)
 Close the CWT access doors 191G and 192G, if opened.

 TASK 12-11-10-603-032
 3.  Drain the Surge Tank With the Surge Tank Drain Fixture (G28015) (Fig. 302)_______________________________________________________________
 A. General
 (1)  Use this procedure to drain a surge tank if it has a large quantity of fuel in it. The surge drain fitting can drain the fuel from the surge tank at approximately 25 gallons per minute.
 B. Equipment
 (1)  
G28015 - Surge Tank Drain Fitting

 (2)  
Container - 100 U.S. gallons (maximum), suitable for fuel servicing

 (3)  
Fuel Drain Hose - 2 inch diameter - suitable for use with fuel (can be made locally)

 (4)  
Hose clamp - 2 inch diameter - (can be made locally)

 C. Access
 (1)  
Location Zones 555 Surge Tank, Front Spar to Rear Spar, Left 655 Surge Tank, Front Spar to Rear Spar, Right

 (2)  
Access Panels 556AB Surge Tank Access Door (Pressure Relief Valve - Left) 656AB Surge Tank Access Door (Pressure Relief Valve - Right)

 D. Procedure
 S 493-033
 (1)  Install the surge tank drain fitting (G28015) on the inboard surge tank access door, 556AB or 656AB.
 (a)  
Remove four of the eight screws that attach the pressure relief valve to the surge tank access door.

 (b)  
Install and tighten the drain fitting.

 S 493-034
 (2)  
Attach a 2-inch fuel drain hose and clamp to the surge tank drain fitting.

 S 493-035

 (3)  
Put the other end of the drain hose in an applicable fuel storage tank or cart.

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747-400 MAINTENANCE MANUAL
 S 653-036
 (4)  Push the plunger on the drain fitting to open the pressure relief valve.
 NOTE: Approximately 25 pounds of force is necessary to open
____
 the pressure relief valve.

 S 653-037
 (5)  The fuel will drain from the surge tank (approximately
 25 gallons per minute).

 E. Put the Airplane Back to the Usual Condition
 S 093-038
 (1)  
After the fuel is removed from the surge tank, remove the surge tank drain fitting and install the four screws that were removed.

 S 433-039

 (2)  
Pull down on the tee handle of the pressure relief valve to reset and close the valve.

 NOTE: When you close the relief valve, make sure you hear a
____
 click.

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747-400
MAINTENANCE MANUAL

SURGE TANK ACCESS DOOR (INBOARD)
SEE A
SURGE TANK
PRESSURE
RELIEF VALVE
ACCESS DOOR
MATING
SURFACE
SURGE TANK DRAIN TOOL
HOSE CLAMP (CAN BE MADE LOCALLY)
FUEL DRAIN HOSE (CAN BE MADE LOCALLY) TO AN APPLICABLE FUEL STORAGE CART
TEFLON 
O-RING  TIP 
BOLT 
(4 LOCATIONS) 
PLUNGER 

SURGE TANK ACCESS DOOR (INBOARD)
A
Surge Tank Fuel Drainage
　
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