H92734 H92738
500 Fuel Pump Flame Arrestor Inspection
May 01/99 Figure 401A (Sheet 1) 28-22-41
Page 406A
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Fuel Pump Flame Arrestor Inspection 500
28-22-41 Figure 401A (Sheet 2) May 01/99
Page 406B
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FUEL BOOST PUMP WIRING AND CONDUIT - INSPECTION/CHECK
1. General
A. This procedure contains two tasks:
(1)
Fuel Boost Pump Wiring Inspection
(2)
Electrical Conduit Leak Test
2. Fuel Boost Pump Wiring Inspection
A. References
(1)
AMM 24-22-0/201, Manual Control
(2)
AMM 27-81-0/201, Leading Edge Flaps and Slats
(3)
AMM 57-30-11/401, Boost Pump Access Door
B. Wiring Removal Procedure
(1)
Set the switches for the fuel boost pumps (on the pilot's overhead panel) to the OFF position.
(2)
Open the following circuit breakers and attach DO-NOT-CLOSE tags on the P6 main power distribution panel:
(a)
BOOST PUMP TANK 1 FWD
(b)
BOOST PUMP TANK 2 FWD
(c)
BOOST PUMP TANK 1 AFT
(d)
BOOST PUMP TANK 2 AFT
(e)
BOOST PUMP CTR TANK LEFT
(f)
BOOST PUMP CTR TANK RIGHT
(3)
To get access to the fuel boost pump, do these steps:
(a) For the forward fuel boost pumps for the No. 1 and 2 tanks on airplanes with leading edge flaps covering the fuel boost pumps, extend the leading edge flaps (AMM 27-81-0/201).
WARNING: MAKE SURE PERSONS AND EQUIPMENT ARE CLEAR OF THE LE 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.
1) Install the flap locks on the leading edge flaps (AMM 27-81-0/201).
WARNING: FOLLOW THE STEPS CAREFULLY IN THE TASK ABOVE INSTALLING THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF THE SAFETY LOCK IS NOT CORRECTLY INSTALLED. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(b) Remove the following access panel to get access to the applicable the fuel boost pump (AMM 57-30-11/401): 1) Panel 7203 (Tank No. 1, aft pump) 2) Panel 7201 (Center tank, left pump) 3) Panel 7401 (Center tank, right pump) 4) Panel 7403 (Tank No. 2, aft pump) 5) Panel 6303 (Tank No. 1, forward pump -airplanes without leading edge flaps
covering the forward fuel boost pumps) 6) Panel 6403 (Tank No. 2, forward pump -airplanes without leading edge flaps covering the forward fuel boost pumps)
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28-22-41 Page 601
(4) Perform the following steps at each of the four applicable fuel boost pumps:
NOTE: The forward boost pumps in the No. 1 and No. 2 tank do not have wiring in conduits. Thus, this inspection is not applicable to these pumps.
NOTE: To improve access to the wiring, remove the fuel boost pump
(AMM 28-22-41/401). This will require additional time to reinstall. A special bonding resistance meter is necessary to install the pump. (SWPM 20-20-00, Test Procedures for Electrical Bonds, Conditions for Bond Tests in an Explosion Hazard Area).
(a)
Disconnect the electrical connector from the fuel boost pump.
(b)
Disconnect the wire clamps from the wiring.
(c)
Remove the wires, with the socket contacts attached, from the electrical connector (SWPM 20-61-11). Keep the electrical connector if undamaged.
(d)
Tie a string (lacing tape or equivalent) to the wire end.
(e)
Apply tape as necessary on the end of wires and socket contacts to ensure smooth movement through conduit.
NOTE: Use a string approximately 15 feet long. Attach the end of the string (end not attached to wiring) to the pump or the airplane to avoid accidentally pulling wire thru conduit.
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