S 094-028

 (3)  
Do this task "Removal of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 (4)  
Close the doors for the main landing gear (AMM 32-00-30/201).

 S 864-024

 (5)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 414-023
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747-400 MAINTENANCE MANUAL
 APU ISOLATION VALVE - MAINTENANCE PRACTICES
___________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task deactivates the APU isolation valve. The second task activates the APU isolation valve.
 B.  The APU isolation valve for the APU bleed air is installed in the wheel well for the left main landing gear. It is in the upper outboard aft corner. You can get access to the valve thru the left wheel well of the main landing gear.
 C.  To deactivate the APU isolation valve, you must put the valve in the CLOSED position and disconnect the electrical connector.
 TASK 36-11-09-042-001
 2.  Deactivate the APU Isolation Valve (Fig. 201)
__________________________________
 A.  References
 (1)  
AMM 09-11-00/201, Towing and Taxiing

 (2)  
AMM 24-22-00/201, Manual Control

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

 (4)  
IPC 36-11-60 Fig. 1

 B.  
Access

 (1)  
Location Zone
 755 Body Landing Gear Wheel Well, LH

 C.  
Prepare to Deactivate the Valve.

 S 862-002
 (1)  Supply the electrical power (AMM 24-22-00/201).
 S 492-003
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Install the ground locks in all the landing gear (AMM 09-11-00/201).
 S 492-004
 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 INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Do this task "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).

 S 492-020

 (4)  
Do this task "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

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747-400
MAINTENANCE MANUAL

SEE A
APU ISOLATION VALVE, V121
MANUAL OVERRIDE DRIVE
FWD
ELECTRICAL
ACTUATOR HOUSING
CONNECTOR
A

APU Isolation Valve Deactivation
Figure 201

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747-400
MAINTENANCE MANUAL

 S 862-005
 (5)  
Put the APU BLEED switch, on the P5 overhead panel, to the OFF position.

 (a)  
Stop for approximately 10 seconds to permit the valve to close.

 S 862-006
 (6)  
Open and attach a DO-NOT-CLOSE tag to the circuit breaker that follows:

 (a)  
On the main power distribution panel P6 1) 6H22 APU ISO VLV AIR SUPPLY PWR.
　
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