(2)  
32-00-01/201, Ground Lock Assemblies

 C.
Access

 (1)  
Location Zone
 101 Control Cabin, Left
 102 Control Cabin, Right
 217 Right Main Wheel Well

 D.
Prepare for the Test

 S 494-030
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)
Install ground locks in all landing gear (Ref 32-00-01/201).

 S 494-031

 (2)  
Put chocks at all of the landing gear wheels.

 S 864-032

 (3)  
Release the parking brake.

 E.
Test

 S 864-017
 (1)  
Pressurize the hydraulic system B to 3000 psi (Ref 29-15-00/201).

 (a)  
Keep the pressure at 3000 psi for a minimum of 2 minutes.

 NOTE: This will make sure the accumulator is full of fluid.
____
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (2)  S 864-018Pressurize the hydraulic system A (Ref. 29-15-00/201).
 (3)  S 864-019Release pressure from the hydraulic system B (Ref 29-15-00/201).
 (4)  S 714-021Do a check of the accumulator pressure:
 NOTE:____ The steps that follow make sure the isolation valve operates correctly when hydraulic power is ON.
 (a)  Operate the brake pedals 5 times.
 NOTE:____ Wait approximately 3 seconds between each operation of the pedals.
 (b)  Make sure the accumulator pressure does not decrease for each operation of the brake pedals.
 (5)  S 864-022Release pressure from the hydraulic system A (Ref 29-15-00/201).
 (6)  S 784-023Make sure the brake accumulator pressure is approximately 3000 psi.
 (7)  S 714-026Do a check of the accumulator pressure:
 NOTE:____ The steps that follow make sure the isolation valve operates correctly when the hydraulic power is OFF.
 (a)  Operate the brake pedals 5 times.
 NOTE:____ Wait approximately 3 seconds between each operation of the pedals.
 (b)  Make sure the brake accumulator pressure decreases with each operation of the brake pedals.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 ALTERNATE BRAKE SELECTOR VALVE - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General
 A.  The operations that follow give the removal and installation of the alternate source selector valve. The valve is located on the ceiling of the main wheel well, aft and to the left of the system A hydraulic fluid reservoir.
 TASK 32-41-93-004-039
 2.  Remove the Alternate Brake Selector Valve (Fig. 401)
_________________________________________
 A.  References
 (1)  
AMM 29-15-00/201, Hydraulic System

 (2)  
AMM 32-00-01/201, Ground Locks

 B.  
Access

 (1)  
Location Zone
 101 Left Control Cabin
 102 Right Control Cabin
 216 Left Main Wheel Well
 217 Right Main Wheel Well
 310 Left Main Landing Gear
 410 Right Main Landing Gear

 C.  
Procedure

 S 844-002
 (1)
Make sure that you install the ground locks (AMM 32-00-01/201).

 S 844-003

 (2)  
Remove the pressure from the A and B hydraulic systems (AMM 29-15-00/201).

 S 844-004

 (3)  
Put chocks on the main gear wheels and release the parking brakes.

 S 844-005

 (4)  
Remove the hydraulic fluid from the brake accumulator.

 (a)  
Fully push the brake pedals 12 times or until the accumulator gage does not show a pressure drop when you apply the brakes.
　
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