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. Procedure
 S 434-015
 CAUTION:_______SLOWLY PUT THE DUCT ASSEMBLY ON THE COMPENSATOR SHAFT. IF YOU DO NOT PUT THE DUCT ASSEMBLY ON SLOWLY, THE INTERNAL SEALS OF THE PRESSURE COMPENSATOR FITTING CAN BE DAMAGED.
 (1)  
Put the duct assembly on the compensator shaft.

 (a)  
Slowly move the assembly forward through the firewall fitting until it is in the pressure compensator fitting.

 NOTE: The pressure compensator fitting is installed forward of
____
 the firewall.

 S 434-016
 (2)  
Tighten the clamp at the duct-to-firewall joint to a maximum of 20 pound-inches (2.26 N.m).

 S 434-017

 (3)  
Put the pressure compensator piston and the retainer on the
 compensator shaft.

 (a)  
Install the retaining nut and the washer.

 S 434-018
 (4)  
Install the assembly for the pressure compensator on the end of the duct which points in the rearward direction.

 S 434-019

 (5)  
Set the top clamp.

 (a)
Tighten the clamp to 90-100 pound-inches (10.17-11.30 N.m).

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747-400 MAINTENANCE MANUAL
 S 434-020
 (6)  Connect the pneumatic tube line for the hydraulic system to the duct fitting.
 S 434-021
 (7)  Attach the support rod to the duct.
 S 864-022
 (8)  Open the applicable circuit breaker and attach a DO-NOT-CLOSE tag: (a) Main Power Distribution Panel, P6 1) 6H32 AIR SUPPLY CONT 1 PWR 2) 6H33 AIR SUPPLY CONT 2 PWR 3) 6H34 AIR SUPPLY CONT 3 PWR 4) 6H35 AIR SUPPLY CONT 4 PWR

 S 864-023
 (9)  
Pressurize the pneumatic system (Ref 36-00-00/201).

 S 214-024

 (10)
 Examine the joints for leakage.

 NOTE: Diffused leakage is permitted; a high concentration of
____ of leakage is not permitted.
 S 864-025
 (11)
 Remove the pneumatic pressure if it is not necessary (Ref 36-00-00/201).

 S 864-026

 (12)
 Remove the DO-NOT-CLOSE tag and close the applicable circuit breaker that follows:

 (a)  
Main Power Distribution Panel, P6 1) 6H32 AIR SUPPLY CONT 1 PWR 2) 6H33 AIR SUPPLY CONT 2 PWR 3) 6H34 AIR SUPPLY CONT 3 PWR 4) 6H35 AIR SUPPLY CONT 4 PWR

 S 864-027
 (13) Remove the electrical power if it is not necessary (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 S 214-028
 (14)
 Examine the door latches for the trailing edge fairing (Ref 54-62-02/501).

 (a)
Make sure there are no cracks and wear.

 (b)
Make sure all of the latch assemblies are installed.

 (c)
Repair and adjust the latches if it is necessary.

 D. Put the Airplane To Its Usual Condition
 S 414-029
 CAUTION: MAKE SURE THE DOORS FOR THE TRAILING EDGE FAIRING ARE LATCHED
_______ CORRECTLY. IF THE DOORS ARE NOT LATCHED CORRECTLY, THEY CAN COME OPEN DURING FLIGHT AND CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (1) Close the doors for the trailing edge fairing (Ref 54-62-00/201).
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