(2)
Check that No. 2 engine fuel shutoff valve is closed.
(a) Fire switch shall be in FIRE position or engine start lever shall be in cutoff.
C. Remove Defueling Valve Actuator Handle Assembly (Fig. 401)
(1)
Support actuator handle assembly and remove mounting bolts.
(2)
Carefully slide actuator handle assembly away from gate assembly until handle assembly is clear of mating part.
D. Install Defueling Valve Actuator Handle Assembly (Fig. 401)
(1)
Lightly coat splines of output shaft with grease.
(2)
Align actuator assembly output shaft with gate assembly input shaft, rotate output shaft until index spline lines up with index spline in input shaft.
(3)
Insert end of output shaft into input shaft, then carefully slide output shaft into input shaft until actuator mounting flange contacts gate assembly.
(4)
Install mounting bolts and lockwire.
501
Nov 01/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-23-11 Page 401
3. Removal/Installation of Defueling Valve Gate Assembly
A. Equipment and Materials
(1)
Cleaning Solvent -Aliphatic Naphtha TT-T-95 (Ref 20-30-31)
(2)
Lock Assembly, Fuel Boost Pump Bypass Valve - ME65-16713
(3)
Suitable container to hold residual fuel from fuel manifold
B. Prepare for Defueling Valve Gate Assembly Removal
(1)
On ALL EXCEPT airplanes with auxiliary fuel tank, check that No. 2 engine fuel shutoff valve is closed.
(a) Fire switch shall be in FIRE position or engine start lever shall be in cutoff.
(2)
On airplanes with auxiliary fuel tank:
(a)
Check that crossfeed manifold valve is closed.
(b)
Remove fuel boost pump bypass valve access plug for tank No. 2 and install lock assembly to close bypass valve.
(3)
Place container under valve to catch fuel.
C. Remove Defueling Valve Gate Assembly (Fig. 401)
(1)
Remove gate assembly attaching nuts and washers.
(2)
Carefully withdraw gate assembly from opening in front spar and lift clear.
NOTE: If port adapter assembly is not being removed, check that mounting bolts were not loosened during removal of gate assembly attaching nuts.
D. Install Defueling Valve Gate Assembly (Fig. 401)
(1)
Clean O-ring groove in gate assembly housing and machined surface of front spar with solvent. Wipe dry with lint-free cloth.
(2)
Install new O-ring, lightly lubricated with fuel, into groove on gate assembly housing.
(3)
Carefully insert gate assembly into port adapter, through opening in front spar.
(4)
Install gate assembly attaching nuts and washer. Torque 50 to 70 pound-inches.
E. Return Airplane to Normal
(1) Open fuel boost pump bypass valve, if closed, by removing lock assembly and install access plug.
520
28-23-11 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/87
4. Removal/Installation of Defueling Valve Port Adapter Assembly
A. Equipment and Materials
(1) Aliphatic Naphtha
B. Prepare for Defueling Valve Port Adapter Assembly Removal
(1)
Defuel and purge No. 2 fuel tank. Refer to 28-23-0, Defueling and 28-10-0, Fuel Storage System - Maintenance Practices.
(2)
Remove second fuel tank access panel outboard of the right engine to gain access to the aft side of wing front spar.
WARNING: COMPLY WITH ALL TANK ENTRY PRECAUTIONS AS GIVEN IN 28-10-0, FUEL STORAGE SYSTEM - MAINTENANCE PRACTICES.
500 Defueling Valve Installation
Nov 15/67 Figure 401 28-23-11
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
C. Remove Defueling Valve Port Adapter Assembly (Fig. 401)
(1)
Perform steps 3.C.(1) and 3.C.(2) to remove gate assembly.
(2)
Gain access to valve through fuel tank access opening and remove bolts attaching fuel line flanges to port adapter assembly.
(3)
With one man inside fuel tank supporting port adapter assembly, second man, outside fuel tank, remove port adapter assembly mounting bolts and washers (Fig. 401).
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