(3)  
36-00-00/201, Pneumatic System

 (4)  
AMM 36-11-01/401, Pneumatic Manifold

 (5)  
36-11-05/201, High Pressure Shutoff Valve

 (6)  
71-11-04/201, Fan Cowl Panels

 (7)  
71-11-06/201, Core Cowl Panels

 (8)  
78-31-00/201, Thrust Reverser System

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - HPC Case 10:00 o'clock
 422 Engine 2 - HPC Case 10:00 o'clock
 432 Engine 3 - HPC Case 10:00 o'clock
 442 Engine 4 - HPC Case 10:00 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 PRV

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

 (2)
Release the pressure in the pneumatic system (Ref 36-00-00/201).

 S 864-004

 (3)  
For the applicable engine, open this circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  
P6 Main Power Distribution Panel
 1) 6H32 AIR SUPPLY CONT 1 PWR
 2) 6H33 AIR SUPPLY CONT 2 PWR
 3) 6H34 AIR SUPPLY CONT 3 PWR

 S 864-002
 S 864-003
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A
747-400
MAINTENANCE MANUAL

P-CLAMP
SEE C7. COUPLING
1. PRESSURE
8. SEAL
REGULATING VALVE (PRV)
BONDING
PRESSURE  2. ELBOW
JUMPER
REGULATING
VALVE

A
C
SEE A  3. UNION
A
4. O-RING
C B
P-CLAMP
SEE D
B
PRV TERMINALMANUAL BLOCKOVERRIDE DRIVE SEE B
5.
 WASHER

6.
 NUT

HIGH PRESURE SHUTOFF VALVE
(HPSOV) PRESSURE REGULATING VALVE A
3.
 UNION

4.
 O-RING

A-A
Pressure Regulating Valve Installation
Figure 401 (Sheet 1)

M47831
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A
747-400
MAINTENANCE MANUAL

7. COUPLING  7. COUPLING 1. PRESSURE 7. COUPLING

PART NUMBER NAS1149C0363R (PREFERRED) PART NUMBER NAS1149C0336R (ALTERNATE) PART NUMBER AN960C10L (ALTERNATE)
INSTALL TERMINAL LUG BARREL SIDE UP
Pressure Regulating Valve Installation Figure 401 (Sheet 2)
M47837
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A

747-400
MAINTENANCE MANUAL

P-CLAMP

Pressure Regulating Valve Installation
Figure 401 (Sheet 3)

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M48810
A
747-400 MAINTENANCE MANUAL 4) 6H35 AIR SUPPLY CONT 4 PWR S 014-005
 WARNING:_______ DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
 PREVENT THE OPERATION OF THE THRUST REVERSER.  ACCIDENTAL
 OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS

 OR DAMAGE TO EQUIPMENT.
 (4)  
Do the deactivation procedure for the thrust reverser for ground maintenance (Ref 78-31-00/201).
　
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