S 864-100

 (38)
 Make sure there is no noise or high frequency instability. S 864-101

 (39)
 Move the landing gear lever to the DOWN position.

 S 864-107 WARNING: MAKE SURE ALL PERSONNEL ARE CLEAR OF ALL FIVE SETS OF GEAR
_______ DOORS BEFORE PROCEEDING.
 (40)
 Move the main gear door release handles to the DOOR CLOSED position. S 844-036

 (41)
 Remove pressure from hydraulic systems if it is not necessary (AMM 29-11-00/201).

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A
747-400 MAINTENANCE MANUAL
 S 494-054
 WARNING:_______ YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
 DOOR LOCKS ON THE LANDING GEAR DOORS.  THE DOORS CAN CLOSE
 QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY.  THIS

 CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (42)
 Do this task:  "Removal of the Door Locks from the Wing Landing Gear" (AMM 32-00-30/201).

 S 494-058

 (43)
 Do this task:  "Removal of the Door Locks from the Body Landing Gear" (AMM 32-00-30/201).

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A
747-400 MAINTENANCE MANUAL
 ALTERNATE SOURCE SELECTOR VALVE - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A.  There are two alternate source selector valves in the brake hydraulic system:
 (1)  
Alternate source selector valve No. 1

 (2)  
Alternate source selector valve No. 2.

 B.  
Alternate source selector valve No. 1 changes the hydraulic source for the brakes from hydraulic system 4 to hydraulic system 1. Alternate source selector valve No. 1 operates if there is low pressure in hydraulic system 4.

 C.  
Alternate source selector valve No. 2 changes the hydraulic source for the brakes from hydraulic system 1 to hydraulic system 2. Alternate source selector valve No. 2 operates if there is low pressure in hydraulic system 1.

 D.  
Alternate source selector valve No. 1 is installed on the keel beam in the right body gear wheel well. Alternate source selector valve No. 2 is installed on the rear spar of the left wing, near the fuselage.

 TASK 32-41-06-004-001
 2.  Alternate Source Selector Valve Removal (Fig. 401)_______________________________________
 A.  General
 (1)  
In this procedure, alternate source selector valve refers to alternate source selector valve No. 1 or alternate source selector valve No. 2.

 (2)  
In subsequent steps, alternate source selector valve is referred to as selector valve.

 B.  
References

 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 (4)  
AIPC 32-41-06 Fig. 1

 (5)  
AIPC 32-41-08 Fig. 5

 C.  
Access

 (1)  
Location Zone
 138 Body Landing Gear Well - Right
 (Alternate source selector valve No. 1)

 571 Rear Spar to Landing Gear Support Beam, Left (Alternate source selector valve No. 2)
 D.  Prepare for the Removal
 S 844-028
 (1)  Make sure the landing gear ground locks are installed (AMM 09-11-00/201).
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