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A
747-400 MAINTENANCE MANUAL
(n)
Do a check for leaks at the Alternate (Brake) Source Selector Valve No. 2.
(o)
Do a check of the fluid level in the reservoir for hydraulic system No. 4. 1) Fill up the reservoir to the correct level if the fluid
level is low (AMM 12-12-01/301).
(p)
Do a check of the fluid level in the reservoir for hydraulic system No. 2. 1) Fill up the reservoir to the correct level if the fluid
level is low (AMM 12-12-01/301).
S 714-027
(7)
Do a test of the selector valve (AMM 32-41-06/501).
F.
Put the Airplane Back to Its Usual Condition
S 094-034
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM 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.
(1)
Do this task: "Removal of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
S 094-036
(2)
Do this task: "Removal of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).
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747-400 MAINTENANCE MANUAL
ALTERNATE SOURCE SELECTOR VALVE - ADJUSTMENT/TEST
_________________________________________________
1. General
_______
A. This procedure contains an operational test for the alternate source selector valves.
B. 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.
C. Do this procedure after the installation of an alternate source selector valve to make sure that the valve operates correctly.
TASK 32-41-06-725-011
2. Operational Test - Alternate Source Selector Valves
___________________________________________________
A. References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 31-61-00/001, Integrated Display System
(5)
AMM 32-00-30/201, Landing Gear Door Locks
(6)
AIPC 32-41-06 Fig. 1
(7)
AIPC 32-41-08 Fig. 5
B.
Access
(1)
Location Zone
138 Body Landing Gear Well - Right
(Alternate source selector valve No. 1) 221 Control Cabin LH 222 Control Cabin RH 571 Rear Spar to Landing Gear Support Beam, Left
(Alternate source selector valve No. 2)
C. Preconditions
S 865-052
(1)
These conditions are necessary for this task:
(a)
Electrical power is available (AMM 24-22-00/201).
(b)
The hydraulic systems are serviceable (AMM 29-11-00/201).
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747-400 MAINTENANCE MANUAL
(c)
The Integrated Display System (IDS) is serviceable (AMM 31-61-00/501).
D.
Prepare for the Test
S 495-024
(1)
Make sure the landing gear ground locks are installed
(AMM 09-11-00/201).
S 845-025
(2)
Make sure the wheel chocks are installed.
S 845-050
(3)
If necessary, release the parking brake.
S 495-026
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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