(2)
Access Panel
454A Trailing Edge Fairing Doors - System 1
464A Trailing Edge Fairing Doors - System 2
474A Trailing Edge Fairing Doors - System 3
484A Trailing Edge Fairing Doors - System 4
C.
Prepare to Remove the Duct
S 864-002
(1) Supply electrical power (Ref 24-22-00/201).
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 duct between the applicable engine and the wing isolation valve (Ref 36-00-00/201).
S 214-004
(3)
Look at the EICAS MAINT PAGE for 21 ECS.
(a)
Make sure the DUCT PRESS shown is 0 psig.
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A
747-400
MAINTENANCE MANUAL
SEE A
SUPPORT ROD
PRESSURE
COMPENSATOR
DUCT ASSY
RETAINING NUT
FWD
DUCT FITTING
CLAMP
PRESSURE
COMPENSATOR
PISTON AND
RETAINER
PRESSURE
COMPENSATOR
CAP
HYDRAULIC SYSTEM
PNEUMATIC LINE
TYPICAL DUCT INSTALLATION
A
95593
Engine Bleed Air Pressure Compensator Duct Installation
Figure 401
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A
747-400 MAINTENANCE MANUAL
S 014-005
(4)
Open the right and left trailing edge fairing doors (AMM 54-62-00/201).
D.
Procedure
S 034-006
(1) Disconnect the support rod from the duct.
NOTE: Keep the rod attached to the firewall.
____
S 034-007
(2)
Disconnect the pneumatic tube for the hydraulic system from the duct.
S 034-008
(3)
Remove the top coupling.
S 034-009
(4)
Remove the assembly for the pressure compensator cap.
S 034-010
(5)
Remove the retaining nut and the washer from the assembly for the pressure compensator.
(a)
Keep the retaining nut and the washer.
S 034-011
(6)
Remove the piston and the retainer from the compensator shaft.
S 034-012
(7)
Loosen the clamp on the rubber boot assembly.
S 034-013
(8)
Move the duct rearward from the firewall fitting until the rod assembly for the pressure compensator is disconnected from the duct.
TASK 36-11-16-404-014
3. Install the Engine Bleed Air Pressure Compensator Duct (Fig. 401)______________________________________________________
A. References
(1) 24-22-00/201, Manual Control
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A
747-400
MAINTENANCE MANUAL
(2)
36-00-00/201, Pneumatic System
(3)
36-11-04/201, Pressure Regulating and Shutoff Valve
(4)
54-62-00/201, Nacelle Strut Access Panels
(5) 中國航空網(wǎng) 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(tǒng) PNEUMATIC SYSTEM(110)
