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 C.  You must drain the hydraulic system reservoir before you remove the hydraulic shutoff valve. It is necessary to disconnect the EDP supply hose from the EDP and install a union in the supply hose. After you install the union, you can drain the reservoir through the EDP supply hose. Do not use the reservoir drain valve because it is higher than the hydraulic shutoff valve.
 TASK 29-11-04-004-031
 2.  Hydraulic Supply Shutoff Valve Removal (Fig. 401)______________________________________
 A.  Standard Tools and Equipment
 (1)  
Union - MS21902-20 (used to open the EDP supply hose self-sealing coupling)

 (2)
Container - 10 U.S. gallon (40 liter) capacity

 B.  
References

 (1)
AMM 24-22-00/201, Manual Control

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

 (3)
AMM 36-00-00/201, Pneumatic System

 (4)
AMM 54-62-00/201, Nacelle Strut Access Panels

 (5)
AMM 78-31-00/201, Thrust Reverser System

 (6)
IPC 29-11-04 Fig. 1 (Outboard), IPC 29-11-04 Fig. 2 (Inboard)

 C.  
Access

 (1)  
Location Zone 452 System 1 - Strut Torque Box - Right Side 412 Engine 1 - Gearbox Forward Face 5:00 o'clock 462 System 2 - Strut Torque Box - Right Side 422 Engine 2 - Gearbox Forward Face 5:00 o'clock 472 System 3 - Strut Torque Box - Right Side 432 Engine 3 - Gearbox Forward Face 5:00 o'clock 482 System 4 - Strut Torque Box - Right Side 442 Engine 4 - Gearbox Forward Face 5:00 o'clock

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 29-11-04
 ALL  ú ú 01P Page 401 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
SEE

 

SHUTOFF VALVE
SEE

Hydraulic Supply Shutoff Valve Installation

Figure 401 (Sheet 1)

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 29-11-04
 ALL  ú ú 01P Page 402 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
12.
A

747-400
MAINTENANCE MANUAL

1.

2.

3.

4.

5.

6.

7.

BOLT (2 LOCATIONS)
WASHER (2 LOCATIONS)
CAP ANGLE
BLOCK HALF
SPACER (2 LOCATIONS)
BLOCK HALF
BLOCK HALF

Hydraulic Supply Shutoff Valve Installation
Figure 401 (Sheet 2)

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 29-11-04
 ALL  ú ú 01P Page 403 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
Access Panel
 452C Upper Midspar Pressure Relief Door - Engine 1
 416 Right Thrust Reverser Half - Engine 1
 462C Upper Midspar Pressure Relief Door - Engine 2
 426 Right Thrust Reverser Half - Engine 2
 472C Upper Midspar Pressure Relief Door - Engine 3
 436 Right Thrust Reverser Half - Engine 3
 482C Upper Midspar Pressure Relief Door - Engine 4
 446 Right Thrust Reverser Half - Engine 4

 D.
Procedure

 S 864-002
 (1)  Supply electrical power (AMM 24-22-00/201).
 S 864-003
 WARNING: MAKE SURE YOU RELEASE THE PNEUMATIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. THE PNEUMATIC SYSTEM PRESSURIZES THE HYDRAULIC RESERVOIR. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
 (2) Release the pressure in the pneumatic system (AMM 36-00-00/201).
 S 864-004
 WARNING: MAKE SURE YOU RELEASE THE HYDRAULIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
 (3)
Release the pressure in the hydraulic system (AMM 29-11-00/201).

 S 864-005

 (4)  
Open the applicable EDP HYD SUPPLY circuit breaker:
　
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