(a)
Extend leading edge flaps and install actuator locks (Ref 27-81-0 MP) for FWD pump. Remove small clearance panel from wing lower skin below removal valve handle. Observe warning and caution note above.
(b)
Remove panel No. 7403, on wing lower skin for AFT pump (Ref 57-30-11 R/I).
(3)
Center Tank
(a)
Remove panel No. 7201, on wing lower surface, for LH pump.
(b)
Remove panel No. 7401, on wing lower surface, for RH pump.
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Oct 20/86 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-41 Page 401
4. Remove Fuel Boost Pump
A. Manually close fuel boost pump removal valve (Fig. 401).
(1) When removing center wing tank boost pump, also close removal valve for opposite center wing tank boost pump.
B. Disconnect electrical plug from fuel boost pump.
C. With suitable container under fuel boost pump drain valve, open drain cock and drain fuel from fuel boost pump.
D. Support fuel boost pump and remove lower bolt from each mounting clamp.
E. Slide mounting clamps down and swing them out, as necessary to clear boost pump flange.
NOTE: If clamps stick, apply additional manual pressure. It is normally unnecessary to loosen or remove shoulder bolt in clamp upper end elongated slot.
F. Pull fuel boost pump straight back from mounting face until free. Lower pump through access opening or guide between front spar and leading edge flap, as applicable.
NOTE: O-rings on fuel boost pump ports form sliding seals in the mating fittings, making it necessary to exert extra pressure when pulling pump free.
535
28-22-41 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/86
F95128
535 Fuel Boost Pump Installation
Feb 01/74 Figure 401 28-22-41
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5. Prepare for Fuel Boost Pump Installation
A. Clean all machined surfaces on fuel boost pump mounting flange and mating surfaces (Ref 20-10-181 C/P). Remove all oxidation deposits and other foreign material, and then wipe dry with lint-free cloth.
B. Install boost pump mounting clamps, if removed (Fig. 401).
(1)
Place mounting clamps in position and install shoulder bolt in elongated slot of each bracket. Do not install lower mounting bolts.
(2)
Tighten shoulder bolts to a torque range of 25 to 30 pound-inches.
(3)
Check that mounting clamps slide freely under shoulder bolts.
NOTE: Binding may be result of using incorrect bolt, addition of washer, or a damaged clamp. Replace parts as necessary and ensure no washer is used under shoulder bolthead.
C. Do a check of the vent port to make sure the fuel pump flame arrestor (breather plug) is installed (Fig 401A).
WARNING: MAKE SURE YOU DO THE INSPECTION FOR THE FUEL PUMP FLAME ARRESTOR. DO NOT INSTALL THE BOOST PUMP WITHOUT THE FLAME ARRESTOR. A FIRE OR EXPLOSION CAN OCCUR IF THE FLAME ARRESTOR IS NOT INSTALLED.
(1) If the fuel pump flame arrestor is not installed, do not install this pump. Install a pump that has the flame arrestor installed correctly.
D. Install new O-rings, lightly lubricated with fuel, into grooves on boost pump inlet, outlet, and vent ports.
E. Prime fuel boost pump.
(1)
Check that fuel boost pump drain valve is closed.
(2)
Support fuel boost pump with inlet port up and pour approximately 1/2 pint of fuel into pump.
(3)
Carefully rotate fuel boost pump to installed position, allowing excess fuel to run out of pump.
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