(2)
AMM 28-11-11/401, Wing Fuel Tank Access Panels
(3)
AMM 28-23-0/201, Defueling
C. Procedure
(1)
Defuel the applicable fuel tank (AMM 28-23-0/201).
(2)
Remove wing fuel tank access panel No. 9 for the applicable wing (AMM 28-11-11/401).
(3)
Do the Purging and Fuel Tank Entry procedure (AMM 28-10-0/201).
WARNING: OBEY THE FUEL TANK ENTRY PRECAUTIONS. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE FUEL TANK ENTRY PRECAUTIONS.
(4)
Put maintenance mats on the surface of the wing in the areas you will work.
CAUTION: PUT MAINTENANCE MATS IN THE AREAS WHERE PERSONS WORK. THE MAINTENANCE MATS PREVENT DAMAGE TO THE WING PANELS.
(5)
Remove the filler cap from the overwing fill port.
(6)
Disconnect the detach lanyard from the lug on the retaining nut.
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G39489
Overwing Fill Port Installation 500
28-11-71 Figure 401 Apr 01/97
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(7)
Do these steps from inside the fuel tank:
(a)
Remove the lockwire between the retaining nut and the airplane structure.
(b)
Use the spanner wrench and remove the retaining nut from the adapter.
(c)
Remove the seal ring from the adapter.
(8)
Go out of the fuel tank to lift and remove the adapter through the opening in the upper wing skin.
3. Install the Overwing Fill Port (Fig. 401)
A. Equipment
(1) Spanner Wrench - ST2580-302
B. References
(1)
AMM 12-11-0/201, Fuel Servicing
(2)
AMM 28-10-0/201, Fuel Storage System (Purging and Entry)
(3)
AMM 28-11-11/401, Wing Fuel Tank Access Panels
C. Procedure
(1)
Obey the fuel tank entry precautions (AMM 28-10-0/201).
WARNING: OBEY THE FUEL TANK ENTRY PRECAUTIONS. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE FUEL TANK ENTRY PRECAUTIONS.
(2)
Install a new O-ring in the groove on the adapter.
(3)
Put and hold the adapter in the opening in the upper wing skin.
(4)
Install a new O-ring in the groove on the seal ring.
(5)
Put a seal ring on the adapter.
(6)
Do these steps from inside the fuel tank:
NOTE: Two persons are necessary to do these steps.
(a)
Install the retaining nut with the spanner wrench.
(b)
Tighten the retaining nut to a torque of 30-40 foot-pounds.
(c)
Install the lockwire between the lug on the retaining nut and the tab on the airplane structure.
(d)
Attach the lanyard on the filler cap to the Lug on the retaining nut.
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(7)
Install the filler cap on the overwing fill port.
(8)
Remove the maintenance mats.
(9)
Remove the equipment used to purge and ventilate the fuel tank (AMM 28-10-0/201).
(10)
Install the No. 9 wing fuel tank access panel (AMM 28-11-11/401.
(11)
Refuel the fuel tank (AMM 12-11-0/201).
(12)
Make sure there are no fuel leaks.
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FUEL VENT SYSTEM -DESCRIPTION AND OPERATION
1. General
A. The fuel vent system prevents damage to the wing structure by providing positive venting of all fuel tanks, regardless of airplane attitude. During flight, the system also helps decrease fuel evaporation and assists the fuel boost pumps by providing a small positive pressure head on the fuel. Venting of the integral fuel tanks is accomplished with sealed hat-shaped upper wing skin stiffener ducts connected to vent surge tanks (Fig. 1). The surge tanks are in turn vented overboard through ram air vent scoops.
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