36-11-16
 ALL  ú ú 01 Page 406 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 PNEUMATIC DUCT INSULATION - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  This procedure contains four tasks. The first task removes the insulation blankets from the APU pneumatic ducts in the aft cargo area. The second task installs the insulation blankets on the APU pneumatic ducts. The APU insulation blankets are located behind the sidewall linings in the aft cargo bay. The third task removes the duct insulation from the precooler inlet duct on the engine. The fourth task installs the duct insulation on the precooler inlet duct on the engine. You can see the engine insulation sections when you extend the thrust reverser. There are no insulation blankets installed on pneumatic ducts in the wing leading edge, air conditioning bay and wheel well.
 TASK 36-11-18-004-001
 2.  APU Pneumatic Duct Insulation Removal (Fig. 401)_____________________________________
 A.  References
 (1)
AMM 24-22-00/201, Manual Control

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

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

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

 B.  
Access

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

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

 C.  
Prepare to Remove the Insulation

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

 S 864-002
 S 864-003
 WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC DUCT BEFORE YOU
_______ REMOVE A PNEUMATIC SYSTEM COMPONENT. IF YOU DO NOT RELEASE THE PRESSURE, HOT HIGH PRESSURE AIR CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2) Release the pressure in the pneumatic system (AMM 36-00-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 36-11-18
 ALL  ú ú 02 Page 401 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

APU PNEUMATIC DUCT INSULATION
SEE A
2.00 |0.25 INCHES
INSULATION BLANKET
FIBERGLASS TAPE
DUCT
LOOSE ENDS
SQUARE KNOT
A
APU Pneumatic Duct Insulation Installation
Figure 401

C18113
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 36-11-18
 ALL  ú ú 01 Page 402 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 214-004
 (3)  
Open the aft cargo door (AMM 52-34-00/001).

 S 014-005

 (4)  
Remove the applicable sidewall lining (AMM 25-52-01/401).

 D.
Remove the Pneumatic Duct Insulation

 S 034-020
 WARNING:_______THE PNEUMATIC DUCTS CAN BE HOT. IF YOU DO NOT TOUCH THE DUCT INSULATION CORRECTLY, INJURY TO PERSONS CAN OCCUR.
 (1)  
Turn the duct insulation until you get access to the square knots in the tape.

 S 034-006

 (2)  
Loosen and remove the square knots.

 NOTE: If you cannot untie the square knots, you can use a knife
____
 cut the tape.

 S 034-007
 (3)  Remove the pneumatic duct insulation blanket.
 TASK 36-11-18-404-029
 3. APU Pneumatic Duct Insulation Installation (Fig. 401)
__________________________________________
 A. Consumable Materials
 (1)  
Mil-Y-1140H Tape - Fiberglass

 B.
References

 (1)  
AMM 20-11-28/401, Standard Practices - Lockwire

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 25-52-01/401, Containerized Cargo Compartment Ceiling and Sidewall Linings

 (4)  
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 氣動系統 PNEUMATIC SYSTEM(112)