FLAP 1 TO
FLAP 2 JOINT
FSS
147.6
FSS
124.6
FSS
104.1 CABLE
CONNECTIONS
SEE C FWD
FRONT SPAR
B
ELECTRICAL CABLE
NUT GROUND WIRE (NOT ON ALL AIRPLANES)GROMMET
FWD ELBOW
CABLE CONNECTION (EXAMPLE)
C
Fuel Boost Pump Wiring Inspection Figure 601 (Sheet 2)
K34564
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
ENGINE FUEL FEED SYSTEM - CLEANING/PAINTING
___________________________________________
1. General_______
A. This procedure is used to flush the fuel lines for the engine fuel-feed system.
TASK 28-22-00-107-014
2. Flush the Fuel Line for the Engine Fuel Feed System___________________________________________________
A. Equipment
(1)
Catch Tank - 55 gallon - one for each engine
(2)
Adapter, MS24398-16-6
(3)
Hose - with sufficient length to go from the strut to the catch tank
B. References
(1)
AMM 24-22-00/201, Electrical Power Manual Control
(2)
AMM 71-11-02/201, Fan Cowl Panels
C. Access
(1)
Location Zones
602 Left Fan Cowl
(2)
Access Panel
5746 Fan Cowl Assembly
D. Prepare to Flush
S 017-002
(1)
Open the left fan cowl panel (AMM 71-11-02/201).
S 037-003
(2)
Disconnect each engine fuel-feed hose at the strut.
S 437-004
(3)
Connect the hose to the adapter.
S 497-001
(4)
Move the hose to a position where the fuel will drain into the catch tank (Fig. 701).
S 867-005
(5)
Make sure the boost pump switches on P5 panel are in the OFF position.
S 867-006
(6)
Make sure these circuit breakers on the P6 panel are in the closed position:
(a) FUEL CONT NO. 1 AFT NO. 2 FWD CTR L
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A
737-300/400/500MAINTENANCE MANUAL
(b) FUEL CONT NO. 1 FWD NO. 2 AFT CTR R
E. Flush the Fuel Lines for the Engine Fuel-Feed System
S 867-009
(1) Supply electrical power (AMM 24-22-00/201).
S 717-010
WARNING: DO NOT OPERATE THE BOOST PUMP FOR MORE THAN 10 SECONDS.
_______ THE OPERATION OF THE BOOST PUMP FOR MORE THAN 10 SECONDS CAN CAUSE TOO MUCH FUEL TO DRAIN INTO THE CATCH TANK.
(2) Operate each boost pump for 10 seconds.
(a) Put each boost pump switch to the ON position for 10 seconds and put it back to the OFF position.
TO CATCH TANK
Engine Fuel Feed System Fuel Line Flushing Figure 701
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737-300/400/500MAINTENANCE MANUAL
(b) Do not operate more than one boost pump at the same time.
S 717-015
(3) Put each boost pump switch to the ON position, one at a time, for 10 seconds.
F. Put the Airplane Back to Its Usual Condition
S 867-011
(1)
Remove electrical power if it is not necessary for other tasks (AMM 24-22-00/201).
S 097-012
(2)
Remove the adapter and the hose.
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