B.  
References

 (1)
AMM 24-22-00/201, Manual Control

 (2)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Lining

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

 (4)
AMM 52-34-00/001, Forward/Aft Cargo Compartment Door

 C.  
Access

 (1)  
Location Zone
 141 Aft Cargo Container Compartment, Left
 145 Bulk Cargo Compartment, Left

 (2)  
Access Panel
 822R Door - Aft Cargo Compartment

 D.  
Procedure

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

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

 (3)
Open the aft cargo door (AMM 52-34-00/001).

 S 868-002
 S 868-003
 S 018-004
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747-400
MAINTENANCE MANUAL

FIBERGLASS TAPE

INSULATION SECTION
(EXAMPLE)

A

Pneumatic Duct Insulation Approved Repairs
C18117
Figure 801

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747-400 MAINTENANCE MANUAL
 S 018-005
 (4)  
Remove the applicable sidewall lining in the aft cargo compartment to get access to the pneumatic duct insulation (AMM 25-52-01/401).

 S 038-006

 (5)  
Remove the fiberglass tape, if it is necessary.

 S 428-007

 (6)  
Replace the insulation blanket if more than 25 percent of the material is not there (AMM 36-11-18/401).

 S 348-008

 (7)  
Put the tape over the tear.

 (a)  
Make sure the tape extends around the tear a minimum of one inch in all directions.

 S 438-009
 (8)  
Install the fiberglass tape, if it was removed.

 E.
Put the Airplane Back to Its Usual Condition

 S 418-020
 (1)  
Install the applicable sidewall lining in the aft cargo compartment (AMM 25-52-01/401).

 (2)  
Close the aft cargo door (AMM 52-34-00/001).

 S 868-021

 (3)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 418-021
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MAINTENANCE MANUAL

 PRESSURE REGULATING VALVE (PRV) - MAINTENANCE PRACTICES
_______________________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task deactivates the pressure regulating valve. The second task activates the pressure regulating valve.
 B.  The pressure regulating valve (PRV) is installed at the 10:00 o'clock position. It is near the high pressure compressor (HPC) case. To deactivate the PRV, it is necessary to remove the positioning screw to release the actuator pressure. The positioning screw must be installed in the switch actuating lever to lock the PRV in the CLOSED position.
 C.  It is necessary to open the left half of the thrust reverser to get access to the PRV.
 TASK 36-11-19-042-001
 2.  Deactivate the PRV (Fig. 201)
__________________
 A.  References
 (1)  
　
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