747-400 AMM 飞机维护手册 STANDARD PRACTICES - ENGINE(13)

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____ thrust wire or push the thrust wire against the tube ferrule or fitting.
 3)  For thrust wire with a large rectangular or circular end, assemble the thrust wire so that the shoulder touches the tube nut.
 NOTE: These thrust wires have a lockwire hole through
____ their head. Use the end of the lockwire from the torqued nut to safety the thrust wire in position.
 4)  For plain thrust wire, assemble the thrust wire flush or below the outside surface of the tube nut.
 5)  The installation is complete and correct if the thrust wire holds the nut on the tube and the nut turns smoothly.
 6)  Remove the plug from the tube and make sure that the tube has no damage or internal blockage.
 TASK 70-20-00-918-006-N00
 3.  Captured Tubes - Tube Nut and Thrust Wire____________________________________
 A.  Equipment
 (1)
PWA 21411 Anvil

 (2)
Bantam Bully Superior Pneumatic and Manufacturing

 Air Hammer  Div. of Herbrand Tool Co. Cleveland, OH
 B.  Access
 (1)  Location Zone
 412 Engine No. 1
 422 Engine No. 2
 432 Engine No. 3
 442 Engine No. 4

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C.  Procedure
 S 028-007-N00
 (1)  Remove the tube nut as follows.
 (a)  
Disconnect the mating tube from the damaged tube nut.

 (b)  
Cover all of the openings to protect them from foreign object damage.

 (c)  
Remove the thrust wire from the tube nut as follows.

 1)  If the tube nut has a thrust wire with a large rectangular or circular end, hold the drilled end and pull the thrust wire out of the nut. a) Remove the worn or damaged tube nut from the tube.
 2)  If the thrust wire is damaged or too tight, cut the tube nut off the end of the tube. 3) If the tube nut has a plain thrust wire, cut the tube nut off the end of the tube (Fig. 801, Sheet 1).
 (d)  If it is necessary, cut the tube nut off the end of the tube as follows (Fig. 801, Sheet 1).
 CAUTION: BE CAREFUL WITH THE CUT-OFF WHEEL NOT TO CAUSE DAMAGE
_______ TO THE FERRULE OR FITTING ON THE TUBE. IF YOU DAMAGE THE FERRULE OR FITTING, THE ENGINE MUST BE REMOVED FROM SERVICE TO REPLACE THE DAMAGED TUBE.
 1)  At a location a small distance outboard of the thrust wire, cut around the tube nut with a high speed cut-off wheel until you see the thrust wire.
 2)  Remove the thrust wire and nut from the tube.
 S 428-008-N00
 (2)  Install a new tube nut and thrust wire as follows (Fig. 801, Sheet 2).
 (a)  
Put the new tube nut onto the tube ferrule or fitting.

 (b)  
Use a strong light or a small test wire to be sure that the wire hole in the tube nut will let the wire go against (but not into) the radius on the ferrule or fitting.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
CAUTION:_______ BE CAREFUL THAT THE TUBE NUT IS IN THE CORRECT POSITION
 BEFORE YOU INSTALL THE THRUST WIRE.  IF THE TUBE NUT IS
 NOT IN THE CORRECT POSITION, THE THRUST WIRE WILL NOT GO
 INTO THE TUBE NUT.

 CAUTION: SUPPORT THE NEW TUBE NUT WITH AN OPPOSITE FORCE WHEN YOU
_______ INSTALL THE THRUST WIRE. THIS WILL PREVENT DEFORMATION OF THE TUBE DURING THE INSTALLATION OF THE THRUST WIRE.
 (c) Install the thrust wire into the tube nut as follows.
 1)  Some thrust wires go into their holes very easily and it will only be necessary to tap the wire into position (use a non-ferrous tool, for example, a brass mallet).
 2)  For tight thrust wires, use the air hammer and anvil.
 NOTE: With this type of power tool do not bend the
____ thrust wire or push the thrust wire against the tube ferrule or fitting.
 3)  For thrust wire with a large rectangular or circular end, assemble the thrust wire so that the shoulder touches the tube nut.
　
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