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May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-51 Page 401
4. Remove Fuel Boost Pump Removal Valve
A. Remove bonding jumper from removal valve.
B. Remove fuel pump inlet line clamp attaching bolt (Fig. 401).
C. Remove valve mounting bolts.
CAUTION: VALVE MUST BE SUPPORTED WHEN LAST BOLT IS REMOVED. IF VALVE IS ALLOWED TO FALL, DAMAGE TO VALVE OPERATING SHAFT OR WING SKIN MAY BE CAUSED.
D. Pull fuel pump inlet line clear of valve far enough to allow valve to be removed.
E. Pull valve straight out until tongue and slot of operating shaft are clear of each other. Lift valve clear.
5. Install Fuel Boost Pump Removal Valve
A. Clean O-ring groove and machined surfaces of valve and mating surfaces with solvent. Wipe dry with lint-free cloth.
B. Install new O-ring, lightly lubricated with fuel, into grooves on valve.
C. Hold inlet line to prevent interference and position valve with tongue and slot of operating shaft engaged.
D. Position pump inlet line flange against valve (Fig. 401).
E. Install valve mounting bolts. Do not tighten.
F. Operate valve handle and position valve for easiest operation, then tighten valve mounting bolts.
NOTE: After valve mounting bolts are tightened, check operation of valve. Maximum operating torque on valve handle is 30 pound-inches.
G. Install fuel pump inlet line clamp attaching bolt.
H. Attach bonding jumper to removal valve.
I. Check electrical bond between removal valve and airplane structure per 20-22-01 I/C.
Resistance shall not exceed 0.010 ohm.
J. Install fuel tank access panel (Ref 28-11-11 R/I).
K. Install boost pump access panel, if removed (Ref 57-30-11 R/I).
NOTE: Insure that boost pump removal valve is open before installing boost pump access panel.
L. Install small clearance panel under FWD boost pump removal valve handle, if removed. Ensure that retaining chain is not pinched between panel and stringers before tightening screws.
M. If extended, remove actuator locks and retract leading edge flaps (Ref 27-81-0 MP).
WARNING: LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.
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28-22-51 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/86
F95134
500 Fuel Boost Pump Removal Valve Installation
Aug 15/78 Figure 401 28-22-51
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FUEL BOOST PUMP BYPASS VALVE AND BYPASS CHECK VALVE - REMOVAL/INSTALLATION
1. General
A. There is one bypass valve and one bypass check valve (if installed) in each wing tank. The valves are mounted inside the tank making it necessary to defuel the applicable tank to gain access to valves.
B. This section contains instructions to remove and install three different types of boost pump bypass valves, one with a valve lock actuating arm and two without the arm. The two valves without the arm are designated as type I and type II. Type I valve is installed within the suction inlet screen assembly. Type II valve is installed in-line between the suction inlet and the fuel crossfeed manifold.
2. Equipment and Materials
A. Aliphatic Naphtha - TT-N-95 (Ref 20-30-31)
B. Bonding meter (Ref 20-22-01 I/C)
3. Prepare for Removal
A. Check that crossfeed valve is closed.
B. Defuel and purge applicable fuel tank (Ref 28-23-0, 28-10-0 MP).
WARNING: EXPLOSIVE AND TOXIC DANGERS OF VAPORS IN VICINITY OF BOTH WET AND DRY FUEL TANKS ARE OF SUCH POTENCY THAT SEVERAL PRECAUTIONS MUST BE ACCOMPLISHED BEFORE TANKS ARE DRAINED AND ENTERED.
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