(a)  
Make sure the flaps do not extend.

 S 865-007
 (3)  
Set the ALTERNATE FLAPS arm switch to the OFF position.

 (a)  
Make sure the flaps extend.

 S 865-013
 (4)  
Move the flap control lever to the 0 unit (FLAPS UP) detent to retract the flaps.

 S 215-009

 (5)  
Do a check of the hydraulic fittings on the bypass valve for leakage.

 E.
Put the Airplane Back to Its Usual Condition

 S 865-010
 (1)  
Do this task to depressurize hydraulic system B: "Depressurize Hydraulic System A, B, or Standby" (Ref 27-51-00/201).

 S 865-016

 (2)
Do this task: "Remove External Power" (Ref 24-22-00/201).

 S 865-011

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6-2 Panel
 1) ALT TE FLAP DRIVE AC

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FLAP PRIORITY VALVE - REMOVAL/INSTALLATION
__________________________________________
 1.  General_______
 A.  There are three tasks in this procedure. There is a task for the removal and a task for the installation of the flap priority valve. There is also a functional test of the flap priority valve.
 B.  The priority valve is installed on the ceiling of the right wheel well near the aft bulkhead.
 TASK 27-51-84-004-001
 2.  Flap Priority Valve Removal (Fig. 401)___________________________
 A.  References
 (1)  
29-15-00/201, Hydraulic Systems A, B, and Standby

 B.  
Access

 (1)  
Location Zone
 217 Main Wheel Well

 C.  
Procedure

 S 864-002
 (1)  
Do this task: "Hydraulic System B Depressurization" (AMM 29-15-00/201).

 S 024-003

 (2)  
Remove the flap priority valve:

 (a)  
Put a container below the priority valve to hold the hydraulic fluid.

 (b)  
Disconnect the hydraulic lines from the priority valve.

 (c)  
Install the plugs in the hydraulic lines.

 (d)  
Remove the priority valve.

 TASK 27-51-84-404-004
 3.  Flap Priority Valve Installation (Fig. 401)________________________________
 A.  Consumable Materials
 (1)  
D00129 Hydraulic Fluid - BMS 3-11

 (2)  
D00567 Skydrol Assembly Lube - MCS 352

 B.  
References

 (1)  
12-12-00/301, Hydraulic Reservoir

 (2)  
29-15-00/201, Hydraulic Systems A, B, and Standby

 C.  
Access

 (1)  
Location Zone
 217 Main Wheel Well

 D.  
Procedure

 S 424-005
 (1)  
Install the flap priority valve:

 (a)
Install the priority valve with the three bolts.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

SEE

FWD
A

Flap Priority Valve Installation

Figure 401

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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