500 Center Tank Scavenge System Component Location
Feb 20/89 Figure 1 (Sheet 2) 28-15-0
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Center Tank Scavenge System SchematicFeb 20/89 Figure 2 28-15-0 Page 5/6BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
CENTER TANK FUEL SCAVENGE SYSTEM - TROUBLE SHOOTING
EFFECTIVITY
AIRPLANES WITH CENTER TANK FUEL SCAVENGE SYSTEM
1. General
A. The following trouble shooting procedures are based on performance of system functional checks and are presented in tree-type format. The functional steps (heavy-line boxes) are connected by shaded arrows to show OK condition path through successful performance responses. When all steps in condition path indicate an OK response, fuel feed system is operable.
B. When a functional check step does not indicate an OK response, follow the NOT OK line to the thin-line box containing applicable trouble symptom. Turn to procedure indicated and follow a single line from box to box by analyzing results of each step until required corrective action is determined. Do the specified corrective action and repeat step at which failure was found.
C. All electrical type trouble shooting procedures are based on assumption that wiring is OK and that electrical power is available. If corrective action in trouble shooting procedure fails to correct problem, check wiring continuity per applicable diagram in Wiring Diagram Manual (WDM).
D. References in trouble shooting boxes refer to applicable chapter - section - subject of the 737 maintenance manual unless reference includes the abbreviation "WDM" in which case the 737 wiring diagram manual should be consulted.
2. Prepare for Trouble Shooting (AIRPLANES PRE-SB 28-1074)
A. Connect external electric power to airplane (AMM 24-22-0/201).
B. Extend flaps and install leading edge flap locks (AMM 27-81-0/201).
WARNING: REFER TO AMM 27-81-0/201 FOR LOCK INSTALLATION PROCEDURE. FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONS.
C. Make sure the engine start levers on the aisle stand are in CUTOFF position.
D. Make sure the fuel quantity in tank No. 1 is between 10 and 80% full and the center tank is more than 10% full.
E. At the tank No. 1 front spar, remove the cap from the fuel flow indicator.
F. Put the tank No. 1 FWD boost pump switch to ON. *[1]
G. Make sure the fuel scavenge flow indicator/check valve needle is in blue band.
3. Prepare for Trouble Shooting (AIPLANES POST-SB 28-1074)
A. Connect external electric power to airplane (AMM 24-22-0/201)
B. Make sure the engine start levers on the aisle stand are in CUTOFF position.
C. Make sure the fuel quantity in tank No. 1 is between 70 and 80% full and the center tank is more than 10% full.
D. Put the tank No. 1 FWD boost pump switch to ON. *[1]
E. Make sure the fuel is not flowing from the center tank to tank No. 1 (center tank and tank No. 1 indicator values stay the same).
*[1] To operate any of the fuel boost pumps, you must be in the flight compartment to continuously monitor the fuel quantity and the low pressure indication in the fuel tank. Immediately put the applicable fuel boost pump switch(es) to OFF if the LOW PRESSURE light comes on and stays on.
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