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A
747-400 MAINTENANCE MANUAL
 INTERMEDIATE PRESSURE CHECK VALVE - REMOVAL/INSTALLATION
________________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task removes the IP check valve from the intermediate pressure bleed port. The second task installs the IP check valve and does a leak test of the IP check valve installation.
 B.  The check valve in the intermediate pressure line keeps the high pressure bleed air out of the engine intermediate bleed port.
 C.  The check valve is installed on the engine in the 9 o'clock position. It is approximately 3 feet (1 meter) aft of the fan frame. It is necessary to open the left thrust reverser half to get access to the valve.
 D.  The installation of the intermediate pressure check valve is the same on all four engines.
 TASK 36-11-02-004-001
 2.  Intermediate Pressure Check Valve Removal (Fig. 401)_________________________________________
 A.  References
 (1)
AMM 24-22-00/201, Manual Control

 (2)
AMM 36-00-00/201, Pneumatic System

 (3)
AMM 78-31-00/201, Thrust Reverser System

 (4)
AMM 36-11-05/201, High Pressure Shutoff Valve

 (5)
IPC 36-11-05

 B.  
Access

 (1)  
Location Zone 412 Engine 1 - High Pressure Compressor Case 9 o'clock 422 Engine 2 - High Pressure Compressor Case 9 o'clock 432 Engine 3 - High Pressure Compressor Case 9 o'clock 442 Engine 4 - High Pressure Compressor Case 9 o'clock

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 C.  
Prepare to Remove the IP Check Valve

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

 S 864-002
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

INTERMEDIATE PRESSURE CHECK VALVE
SEE A
6. PRESSURE CONTROLLER 
13. PRESSURE REGULATING  5. E-SEAL 4. COUPLING  UPSTREAM PRESSURE SUPPLY LINE 
SUPPORT ROD  VALVE 
SEE  B 

B 
B 
A  AA  A 
14. INTERMEDIATE 
PRESSURE DUCT  10. COUPLING 11. E-SEAL  B  B  7. HP/IP MANIFOLD 

8. COUPLING 1. HIGH PRESSURE 9. E-SEAL SHUTOFF VALVE
12. INTERMEDIATE 2. COUPLING
PRESSURE 3. E-SEAL
CHECK VALVE
A
Intermediate Pressure Check Valve Installation Figure 401 (Sheet 1)
D20939
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 36-11-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

12. INTERMEDIATE
8. COUPLING
PRESSURE

A-A

LOCKING NUT
LOCKING DEVICE
7. HP/IP

B

Intermediate Pressure Check Valve Installation

Figure 401 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
D20940
A
747-400 MAINTENANCE MANUAL
 S 864-005
 WARNING: RELEASE THE PRESSURE IN THE PNEUMATIC DUCT BEFORE YOU REMOVE A
_______ PNEUMATIC SYSTEM COMPONENT. THE HOT AND HIGH PRESSURE AIR CAN CAUSE INJURIES TO PERSONS.
 (2)  Release the pressure in the pneumatic system (AMM 36-00-00/201).
 S 014-003
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
　
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