C.  
Prepare to Remove the ADP Pneumatic Duct

 S 864-002
 (1)  
Supply electrical power (Ref 24-22-00/201).

 D.  
Remove the ADP Pneumatic Duct Screen

 S 864-003
 WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC SYSTEM BEFORE
_______ YOU REMOVE A PNEUMATIC SYSTEM COMPONENT. IF YOU DO NOT RELEASE THE PRESSURE FIRST, THE HOT HIGH PRESSURE AIR CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Release the pressure in the duct between the applicable engine and the wing isolation valve (Ref 36-00-00/201).

 (2)
Remove the engine bleed air compensator duct (Ref 36-11-16/401).

 S 864-004
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A
747-400 MAINTENANCE MANUAL
SEEA  A
SUPPORT ROD
PRESSURE
ACOMPENSATOR DUCT ASSY
RETAINING NUT
COUPLING
RUBBER BOOT ASSEMBLY
FWD
TYPICAL DUCT INSTALLATION
A
SUPPORT RINGBOLT SCREEN
A-A ADP Pneumatic Duct Screen Figure 401
COUPLING
PRESSURE
COMPENSATOR
PISTON AND
RETAINER

PRESSURE
COMPENSATOR
CAP

HYDRAULIC RESERVOIR PRESSURIZATION TUBE
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747-400 MAINTENANCE MANUAL
 S 024-005
 (3)  
Remove the bolt and the collar fasteners that hold the inlet screen in the duct upper leg.

 (a)  
Remove the screen.

 TASK 36-11-24-404-006
 3.  Install the ADP Pneumatic Duct Screen (Fig. 401)_____________________________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
36-00-00/201, Pneumatic System

 (3)  
36-11-16/401, Engine Bleed Air Pressure Compensator Duct

 (4)  
54-62-00/201, Nacelle Strut Access Panels

 (5)  
AMM 54-62-02/501, Nacelle Strut Access Doors

 B.
Access

 (1)  
Location Zone
 454 System 1 - Strut Trailing Edge Fairing
 464 System 2 - Strut Trailing Edge Fairing
 474 System 3 - Strut Trailing Edge Fairing
 484 System 4 - Strut Trailing Edge Fairing

 (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.
Install the ADP Pneumatic Duct Screen

 S 424-007
 (1)  
Use the bolt and the collar fasteners to install the pneumatic duct screen in the duct.

 S 864-008

 (2)  
Remove the electrical power if it is not necessary (Ref 24-22-00/201).

 S 214-009

 (3)  
Examine the latches of the trailing edge fairing door for cracks and wear.

 (a)
Make sure all the latch assemblies are installed.

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747-400 MAINTENANCE MANUAL
 (b)  Repair and adjust the latches if it is necessary (Ref 54-62-02/501).
 D. Put the Airplane to Its Usual Condition
 S 414-010 CAUTION: MAKE SURE THE TRAILING EDGE FAIRING DOORS ARE LATCHED
_______ CORRECTLY. IF THE DOORS ARE NOT LATCHED CORRECTLY, THEY CAN COME OPEN DURING FLIGHT. THIS CAN CAUSE DAMAGE TO EQUIPMENT.
　
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