S 042-007
 (7)  
Examine the position indicator on the actuator housing.

 (a)  
If the position indicator is not in the CLOSED position, turn the manual drive until the valve is in the CLOSED position.

 S 042-008
 (8)  
Disconnect the electrical connector DV121 from the valve.

 S 042-009

 (9)  
Put caps on the parts that follow:

 (a)  
The open ends of the electrical connector.

 1)  Put the electrical connector in a location where it will be safe.

 (b)  
Put caps on the connection on the actuator.

 S 862-010
 (10) Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 TASK 36-11-09-442-011
 3.  Activate 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.  
Activate the valve

 (1)  
Supply the electrical power (AMM 24-22-00/201).

 S 862-012
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 S 492-013
 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 492-014
 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 492-021

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

 S 862-015

 (5)  
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

 S 862-016
 (6)  
Put the APU BLEED switch, on the P5 overhead panel, to the OFF position.

 S 442-017

 (7)  
Remove the caps from the electrical connections.

 (a)  
Connect the electrical connector, DV121, to the connection on the valve actuator.

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 D. Put the Airplane to Its Usual Condition
 S 862-018
 (1)  
Remove the DO-NOT-CLOSE tag and close the APU ISO VLV AIR SUPPLY PWR circuit breaker.

 S 862-019

 (2)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 APU ISOLATION VALVE - REMOVAL/INSTALLATION
__________________________________________
 1.  General
　
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