(a)  
Loosen the T-bolt nut on the clamp assembly from the ball joint installation. 1) Remove the clamp assembly.

 (b)  
Unscrew the retainer nut from the threaded section of the retainer flange for the other duct section. 1) Slide the retainer nut away from the duct joint. 2) Slide the seal ring away from the duct joint.

 (c)  
Remove the duct section.

 S 034-169
 (2)  Put a cover on each open duct section to keep out unwanted objects.
 TASK 36-11-01-404-142
 5. Duct Section with a Ball Joint Installation (Fig. 402)
___________________________________________
 A. Consumable Materials
 (1)  D01062, Never-Seez, Pure Nickel Special, NSBT-8N
 (High temperature anti-seize compound)

 B. References
 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 (2)  
AMM 71-11-06/201, Core Cowl Panels

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 C. Install the Duct Ball Joint
 S 014-209
 (1)
If installed, remove covers from duct sections to be joined.

 S 214-146

 (2)  
Make sure that the new duct section and the adjacent duct sections do not contain unwanted objects.

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747-400 MAINTENANCE MANUAL
 S 214-210
 (3)  Make sure the threads of the flange and bearing nut are clean and free of burrs.
 S 224-221
 CAUTION:_______DO THE BALL JOINT INSPECTION. DUCT LEAKAGE AND DAMAGE CAN OCCUR IF THE PARTS ARE WORN MORE THAN THE ALLOWANCE.
 (4)  
Do the ball joint inspection for wear (Fig. 402).

 S 644-212

 (5)  
Apply anti-seize compound to the threads of the ball joint flange and bearing nut.

 S 434-149

 (6)  
Put the duct sections together and align them in the correct position.

 (a)  
Slide the seal ring into position.

 (b)  
Slide the bearing nut over the seal and towards the flange for the duct section to be connected.

 (c)  
Screw the bearing nut onto the flange, but do not tighten.

 S 434-213
 (7)  
Torque the bearing nut to 50 - 60 foot-pounds (67.8 - 81.3 N.m).

 S 354-214

 (8)  
Use a non-metallic hammer to carefully tap the joint, around the edge.

 S 434-217

 (9)  
Torque the bearing nut to 50 - 60 foot-pounds (67.8 - 81.3 N.m).

 S 354-215

 (10)
 Repeat the hammering and torque process as required to install the locking clamp assembly.

 (11)
 Put the locking clamp on the bearing nut.

 S 414-219

 (12)
 Put the slots of the locking clamp on the lockwire retainer on the flange.

 S 414-220

 (13)
 Put the pin in the nut wrench hole that is 180 degrees from the lockwire retainer.

 (14)
 Tighten the locking clamp to 25 - 35 inch-pounds (2.8 - 3.9 N.m).

 S 414-218
 S 434-216
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 D. Restore the Airplane to Normal.
 S 414-159
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  
Close the left thrust reverser (AMM 78-31-00/201).

 S 414-160

 (2)  
Close the left core cowl panel (AMM 71-11-06/201).

 S 414-161

 (3)  
Close the left fan cowl panel (AMM 71-11-04/201).

 S 444-162

 (4)  
Do the activation procedure for the thrust reversers (AMM 78-31-00/201).
　
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