(a)
Remove the flap locks from the leading edge flaps (AMM 27-81-0/201).
WARNING: CAREFULLY FOLLOW THE STEPS IN THE TASK ABOVE TO REMOVE THE LE FLAP SAFETY LOCKS CORRECTLY. IMPROPER REMOVAL CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(b)
Retract the leading edge flaps if extended.
WARNING: ENSURE PERSON AND EQUIPMENT ARE CLEAR OF THE LE FLAP AND TE FLAPS AND FLAP DRIVE MECHANISMS. THE LEADING EDGE AND THE TRAILING EDGE CONTROL SURFACES CAN EXTEND AND RETRACT QUICKLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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28-22-41 Page 605
3. Electrical Conduit Leak Test
A. Procedure
(1)
Do the necessary steps to remove the wiring from the conduit in the task, FUEL BOOST PUMP WIRING INSPECTION.
(2)
Do one of the following three tests to find if a leak exists in the electrical conduit:
(a)
Test 1 1) Fill the applicable fuel tank with fuel. 2) After five minutes, ensure there is no sign of fuel leakage at the ends of thee
electrical conduit. 3) Examine the end of the electrical conduit at the front spar and the end near the fuel boost pump for indications of fuel leakage.
(b)
Test 2 1) Fill the applicable fuel tank with fuel. 2) Pull a clean cloth through the electrical conduit with the string.
NOTE: Tie a second string to the cloth so a string is available to pull the wire through the conduit for the wire insulation.
3) Ensure there is no fuel on the cloth.
(c) Test 3
1) Use the necessary fittings to plug one end of the electrical conduit and to connect a pressure gage and air supply to the other end of the electrical conduit.
2) Pressurize the electrical conduit to 20 psi and shut off the air supply. 3) After five minutes with no supply of air, ensure the pressure shown on the pressure gage do not decrease.
NOTE: A pressure gage must be connected so it reads the pressure in the conduit when the air supply is shut off.
NOTE: This test can be done with any quantity of fuel in the tank.
(3)
If a leak is not found (using one of the above tests), then it is not necessary to replace the electrical conduit immediately, but referral to SB 737-28-1120 provides inspection requirements.
(4)
If a leak is found (using one of the above tests), then replacement of the leaking section of conduit is required before the next flight.
(5)
Do the necessary steps to replace or reinstall the wiring in the task, Fuel Boost Pump Wiring Inspection.
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May 01/00
L17383 L17400
500 Fuel Boost Pump Installation
May 01/00 Figure 601 (Sheet 1) 28-22-41
Page 607
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Fuel Boost Pump Wiring Inspection 500
28-22-41 Figure 601 (Sheet 2) May 01/00
Page 608
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FUEL BOOST PUMP REMOVAL VALVE - REMOVAL/INSTALLATION
1. General
A. Removal/installation procedure for all the fuel boost pump removal valves is basically the same, the only differences being location and access. Tank No. 1 and 2 each contain three valves. As the valves are located inside the tanks it is necessary to defuel the applicable fuel tank to gain access to any valve. It is also necessary to remove boost pump access panel or extend leading edge flaps to gain access to removal valve actuating handle.
2. Equipment and Materials
A. Cleaning Solvent - Aliphatic Naphtha TT-N-95 (Ref 20-30-31)
B. Leading Edge Flap Actuator Locks - F80048-89 (Preferred), F80048-90 (Preferred), F80048-84 (Alternate), and F80048-36 (Alternate)
C. Bonding meter (Ref 20-22-01 I/C)
3. Prepare Fuel Boost Pump Removal Valve for Removal
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