S 862-004

 (3)  
Set the parking brake.

 S 492-006

 (4)  
Install the ground lock assembly in the nose gear
 (AMM 32-00-01/201).

 S 862-005

 (5)  
Set the ELEC 1, HYD PUMPS B switch on the forward overhead panel to ON to pressurize the hydraulic system B.

 F.  
Put the Airplane Back to its Usual Condition

 S 862-003
 (1)  
Set the ELEC 1, HYD PUMPS B switch to OFF.

 S 862-002

 (2)  
Remove electrical power (AMM 24-22-00/201).

 S 092-007

 (3)  
Remove the ground lock assembly (AMM 32-00-01/201).

 TASK 27-81-00-862-014
 3.  Leading Edge Flaps and Slats Hydraulic Systems A, B and Standby_______________________________________________________________ Depressurization________________
 A.  General
 (1)  The leading edge flaps and slats receive pressure from the hydraulic System B (which includes pressurization originated by the (EDP) Engine Driven Pump and the (EMDP) Electric Motor Driven Pump), the standby hydraulic system, and the (PTU) Power Transfer Unit with System A. You must release pressure from all three hydraulic systems before you do maintenance on the leading edge components.
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A

737-300/400/500
MAINTENANCE MANUAL

LEADING EDGE STANDBY 
DRIVE SHUTOFF VALVE 
SEE  A 
FLIGHT CONTROLS 
LOCK ASSEMBLY, 
F80049-12 
LEADING 
EDGE DEVICES 
SHUTOFF VALVE 

STANDBY HYDRAULIC MODULE
A
Hydraulic Module Lock Installation Figure 201
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 B.
C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
Special Tools and Equipment
 (1)
F80049-12 - Flight Controls Lock AssemblyReferences

 (1)
AMM 29-09-00/201, Hydraulic Reservoir Pressurization SystemAccess

 (1)  
Location Zone 101 Control Cabin, LH 102 Control Cabin, RH 216 Main Wheel Well, LH 217 Main Wheel Well, RH

Procedure
 S 862-036
 (1)  
Release the pressure from the Leading Edge Flaps and Slats Hydraulic Systems A, B, and Standby (AMM 29-09-00/201).

 S 862-047

 (2)  
Make sure the leading edge flaps, leading edge slats, and trailing edge flaps are in the full (UP) retracted position.

 S 862-020

 (3)  
Make sure the alternate flap arm switch on the forward overhead panel is in the OFF position.

 S 862-021

 (4)  
Make sure the ELEC 1, HYD PUMPS B switch on the forward overhead panel is OFF.

 S 862-022

 (5)  
Make sure the ELEC 2, HYD PUMPS A switch on forward overhead panel is OFF.

 S 862-038

 (6)  
Put the ENG 1 HYD PUMPS A switch on the forward overhead (P5) panel in the OFF position.

 S 862-039

 (7)  
Put the ENG 2 HYD PUMPS B switch on the forward overhead panel in the OFF position.

 S 862-040

 (8)  
Attach DO-NOT-OPERATE tags on the ENG 1 HYD PUMPS A and ENG 2 HYD PUMPS B switches.

 S 862-023

 (9)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6-2 Circuit Breaker Panel

 1)  FLAP SHUTTOFF VALVES or
 FLAP
 SHUTOFF VALVES

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