S 414-027
 (10) Close the right thrust reverser half (AMM 78-31-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 414-033
 CAUTION:_______ DO NOT LEAVE TOOLS OR LOOSE UNWANTED MATERIAL IN THE EMPTY
 AREAS OF THE STRUT.  THIS CAN CAUSE BLOCKAGE OF A DRAIN LINE
 AND STOP THE OPERATION OF THE DRAIN SYSTEM.

 (11)
 Close the pressure relief door on the forward upper midspar (AMM 54-62-00/201).

 S 864-029

 (12)
 Release the pneumatic pressure if it is not necessary for other operations (AMM 36-00-00/201).

 S 864-030

 (13)
 Remove electrical power if it is not necessary for other operations (AMM 24-22-00/201).

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A
747-400 MAINTENANCE MANUAL
 HYDRAULIC SUPPLY SHUTOFF VALVE - ADJUSTMENT/TEST
________________________________________________
 1.  General_______
 A.  This procedure contains a task to do an operational test of the hydraulic supply shutoff valve. During this procedure the hydraulic supply shutoff valve is referred to as the hydraulic shutoff valve.
 B.  The hydraulic shutoff valve is installed in the strut. You can get access to the valve through the pressure relief door on the forward upper midspar.
 TASK 29-11-04-705-020
 2.  Hydraulic Supply Shutoff Valve Operational Test (Fig. 501)_______________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 B.  
Access

 (1)  
Location Zone 452 System 1 - Strut Torque Box - Right Side 462 System 2 - Strut Torque Box - Right Side 472 System 3 - Strut Torque Box - Right Side 482 System 4 - Strut Torque Box - Right Side

 (2)  
Access Panel 452C Upper Midspar Pressure Relief Door - Engine 1 462C Upper Midspar Pressure Relief Door - Engine 2 472C Upper Midspar Pressure Relief Door - Engine 3 482C Upper Midspar Pressure Relief Door - Engine 4

 C.  
Procedure

 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-003

 (2)  
Close the circuit breaker for the HYDRAULICS EDP SUPPLY for the applicable system:

 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7J04 HYDRAULICS EDP SUPPLY 1
 2) 7J05 HYDRAULICS EDP SUPPLY 2
 3) 7J06 HYDRAULICS EDP SUPPLY 3
 4) 7J07 HYDRAULICS EDP SUPPLY 4

 S 865-004
 (3)  
Open the circuit breakers for the FIRE EXTINGUISHER for the applicable system:

 (a)  
P6 Main Power Distribution Panel 1) 6H01 FIRE EXTINGUISHER ENG 1 & 3 B 2) 6H02 FIRE EXTINGUISHER ENG 1 & 3 A

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
SEEA
HYDRAULIC 
POSITION INDICATOR  SUPPLY SHUTOFF 
(SHOWN IN OPEN POSITION)  VALVE 

A

Hydraulic Supply Shutoff Valve Position Indication

Figure 501

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