(c)  
If no fuel flows from the drain, one of these valves operates correctly: 1) The discharge check valve for the applicable boost pump in

 the center tank. 2) The applicable forward/center check valve.

 (d)  
If some fuel flows from the drain, one or more of these valves does not operate correctly: 1) If the fuel flow increases when the line is pressurized,

 these two valves (both) do not operate correctly: a) The discharge check valve for the applicable boost pump in the center tank b) The applicable forward/center check valve.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 2)  If the fuel flow does not increase when the fuel line is pressurized, one of these valves does not operate correctly: a) The boost pump removal valve for the applicable boost
 pump in the center tank b) The check valve for the fueling line outlet on the applicable boost pump in the center tank.
 S 865-189
 (7)  Stop the boost pump operation.
 (a)  
Set the switch of the fuel boost pump that you used to pressurize the line to the OFF position.

 (b)  
Open the circuit breaker for that boost pump.

 (c)  
Open the removal valve for that boost pump.

 (d)  
Let the fuel drain from the drain valve.

 (e)  
Close the drain valve for the fuel boost pump.

 H.  Put the Airplane Back to Its Usual Condition.
 S 865-101
 (1)  Put the crossfeed valve switch, on the P5 panel, in the CLOSED position.
 (a)  Install the small clearance panels below the handles on the removal valve for the FWD boost pump.
 S 095-102
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE
_______ THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT REMOVE THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Remove the leading edge flap locks (AMM 27-81-00/201).
 S 865-103
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
_______ AND TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  Retract the leading edge flaps (AMM 27-81-00/201).
 (a)  Install the access panels for the aft boost pumps for the main tanks and for all the boost pumps for the center tank.
 NOTE: Make sure the removal valves for the boost pumps are
____ open before you install the access panels.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 S 865-106
 (4)  Remove the external electrical power, if it is not necessary for other tasks (AMM 24-22-00/201).
 TASK 28-22-00-715-107
 7. Fuel Boost Pump Bypass Valve Test
_________________________________
 A. References
 (1)  
AMM 71-00-00/201, Power Plant

 (2)  
AMM 71-00-01/201, Power Plant

 B. Prepare for the Test
 S 865-108
 (1)  On the P5 panel, make sure the switch for the fuel crossfeed valve is in the closed position (Fig. 501).
 NOTE: When you do this test, the fuel must go directly from the
____
 tank to the engine fuel feed.

 S 975-114
 (2)  
Find the takeoff power in %N1 from the applicable tables (AMM 71-00-01/201).

 S 975-115

 (3)  
Multiply by 0.9 to calculate 90% of the takeoff power (the target %N1).

 S 865-178
 WARNING: DO ALL THE NECESSARY SAFETY PROCEDURES TO MAKE SURE THE
_______ AIRPLANE DOES NOT MOVE DURING HIGH POWER ENGINE OPERATION. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
　
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