S 862-028

 (7)  
Move the flap control lever to the UP position to fully retract the flaps and slats.

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737-300/400/500MAINTENANCE MANUAL
 S 862-029
 (8)  
Move the flap control lever to the 5 unit position to extend the leading edge slats to the intermediate position.

 S 862-030

 (9)  
Remove the system B hydraulic power (Ref 29-15-00/201).

 S 862-031

 (10)
 Supply the system A hydraulic power (Ref 29-15-00/201).

 S 212-014
 CAUTION:_______MAKE SURE THE SYSTEM B HYDRAULIC RESERVOIR IS PRESSURIZED. THE CHECK VALVE FOR THE PTU CAN BE DAMAGED IF YOU OPERATE THE PTU WITHOUT PRESSURE IN THE HYDRAULIC RESERVOIR.
 (11) Look at the pressure gages for the system B hydraulic reservoir (above the electric motor driven pump in the main wheel well). Make sure the system B reservoir has a pressure of 45-65 psi.
 S 712-032
 WARNING: MAKE SURE PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING EDGE
_______ SLATS DURING THIS PROCEDURE. THE SLATS CAN MOVE AUTOMATICALLY (UNLESS OTHERWISE INHIBITED) WHEN THE HYDRAULIC SYSTEM IS PRESSURIZED, THE TRAILING EDGE FLAPS ARE EXTENDED AND THE AIR/GROUND RELAYS SENSE AN AIRBORNE CONDITION. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (12) Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  
P6 Panel
 1) NOSE GEAR AIR/GND

 (b)  
Make sure the PTU starts.

 S 712-033
 (13) Remove the DO-NOT-CLOSE tag and close this circuit breaker:
 (a)  
P6 Panel
 1) NOSE GEAR AIR/GND

 (b)  
Make sure the PTU stops.

 S 792-034
 (14)
 Examine the hydraulic connections at the PTU filter module for leaks.

 (15)
 Remove the system A hydraulic power (Ref 29-15-00/201).

 S 862-035
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 S 612-036
 (16) Fill the hydraulic reservoirs if it is necessary (Ref 12-12-00/301).
 D. Put the Airplane Back to Its Usual Condition
 S 862-037
 (1)  
Supply the system B hydraulic power (Ref 29-15-00/201).

 S 862-038

 (2)  
Move the flap control lever to the UP position to fully retract the flaps.

 S 862-039

 (3)  
Remove the system B hydraulic power (Ref 29-15-00/201).

 S 862-040

 (4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P6 Panel
 1) PTU/LG BYP V CONT 2
 2) STANDBY HYD PUMP NORMAL
 3) STBY HYD PUMP (ALTERNATE)

 (5)  
Remove the electrical power (Ref 24-22-00/201).

 S 862-041
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737-300/400/500MAINTENANCE MANUAL
 PTU CONTROL VALVE - REMOVAL/INSTALLATION
________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is a task for the removal and a task for the installation of the PTU control valve.
 TASK 29-22-31-004-011
 2.  PTU Control Valve Removal (Fig. 401)_________________________
 A.  Equipment
 (1)  Container to catch hydraulic fluid
　
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