747-400 AMM 飞机维护手册 机翼 WINGS(16)

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 1) For bolt part number BACB30NH14SUXX, tighten to 2600 to 3000 pound-inches. 2) For bolt part number BACB30US14KXX, tighten to 5100 to 6700 pound-inches.
 G. Align the Spherical Bearing and Gate Fitting.
 S 844-047
 WARNING:  YOU MUST NOT REMOVE THE VALVE BODY WHEN THERE IS PRESSURE ON
_______ IT. THE VALVE CAN BLOW OUT AND CAUSE INJURY TO PERSONS.
 (1)  Remove the charging valve cap on the shock strut of the wing landing gear.
 S 874-073
 WARNING:  BEFORE YOU DEFLATE THE STRUT, MAKE SURE THAT THE AREA BELOW THE WING IS CLEAR. WHEN YOU DEFLATE THE STRUT, THE WING CAN LOWER MANY FEET, WHICH CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (2)  
Loosen the outer nut no more than two turns to remove the pressure from the shock strut.

 S 864-049

 (3)  
When the air flow stops, replace the cap.

 S 494-050

 (4)  
Install the lock assembly for the wing gear oleo.

 S 584-051

 (5)  
Lift the airplane on jacks until the wheels do not touch the ground (Ref 7-11-01/201).

 NOTE: Apply a 20,000-pound load on inboard auxiliary wing jacks and
____ a 10,000-pound load on outboard auxiliary wing jacks. For an airplane that has a fuel load that is not symmetrical, apply the jack loads in proportion to the unbalanced condition or move fuel to symmetrically load the airplane.
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747-400 MAINTENANCE MANUAL
 S 864-052
 (6)  Apply a 20,000-pound load on the inboard auxiliary wing jacks and a 10,000-pound load on the outboard auxiliary wing jacks.
 NOTE: For an airplane that does not have a symmetrical fuel load,
____ apply the jack loads in proporation to the unbalanced condition or transfer fuel to symmetrically load the airplane.
 H. Continue the Installation.
 S 434-053
 (1)  
Install the bearing pin (26) through the spherical bearing (24) and into the gate fitting (15).

 S 034-054

 (2)
Remove the grease retainer plug (41) from the bearing pin (26).

 S 434-055

 (3)  
Install the pin radius filler (23) and the nut (22) on the bearing pin (26).

 (a)  
Hold the bearing pin (26) stationary with a torque holder.

 (b)  
Tighten the nut (22) to 1300 to 1500 pound-inches with a torque wrench adapter.

 (c)  
Make sure the thread protrusion through the nut (22) is at a minimum of 0.15 inch.

 (d)  
Tighten the nut (22) if it is necessary to get the 0.15-inch minimum thread protrusion.

 

 S 434-056
 (4)  Install the bearing retainer.
 (a)  
Partially install the bearing retainer (10) on the bearing pin (26).

 (b)  
Make sure the retainer will turn with a torque of less than 500 pound-inches.

 (c)  
Adjust the load on the jacks if it is necessary to get the correct freedom of rotation of the bearing retainer (10).

 NOTE: Do not permit more than 30,000 pounds on the inboard
____ auxiliary wing jacks. Do not permit more than 25,000 pounds on the outboard auxiliary wing jacks.
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747-400 MAINTENANCE MANUAL
 (d)  Install the bearing retainer (10) on the bearing pin (26) and into the gate fitting (15).
 NOTE: Apply a layer of grease to the mating surfaces before
____ the installation. Adjust the load on the beam or adjust the load on wing jack if it is necessary until you can turn the bearing retainer (10) into the gate fitting (15).
 (e)  
Tighten the bearing retainer (10) tightly against the spherical bearing (24) between 40 to 70 pound-inches more than the run-on torque.

 (f)  
Loosen the bearing retainer (10) 60 |30 degrees counterclockwise as it is necessary to align one of the half-round key slots with corresponding slot on the bearing pin (26).
　
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