20-11-05
 ALL  ú ú 03 Page 808 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 438-289
 (3)  To use assembled tube ends or a center section to do a repair, find the cutout length and install as follows:
 (a)  
Make an estimate of the total length (L1) of the repair section necessary to replace the damaged tube (see Fig. 806 & 809).

 (b)  
Cut and trim the repair tube as follows: (see Fig. 804) 1) Use the correct size ratchet chipless cutter. 2) Turn the cutter drive screw counter clockwise to retract

 the cutter wheel. 3) Put the cutter over the tube. 4) Turn the screw clockwise until the cutter touches the tube
 at the necessary cut location. 5) Turn the screw 1/8 to 1/4 turn and rotate the cutter until
 the cutter is easy to rotate. The tube should now be cut. 6) Remove the tool. 7) To deburr the tube use the correct stem subassembly and
 deburring tool. To assemble the tool refer to Fig. 804. 8) Push down on the plunger and install the tool into the end of the tube. 9) Release the plunger. Let the plug fill the inside of the
 tube. 10) Rotate the deburring tool until the inside burr is removed. 11) Remove the tool with the plug expanded. The expanded plug
 should remove metal particles from the inside of the tube.
 NOTE: Make sure you do not drop metal particles in the
____
 area of the repair.

 (c)  
Swage the necessary flareless sleeves to the repair tube as told in the applicable section:

 -
Swage BACS13BX Flareless Sleeves with the Harrison Elastomer Swagers 5175, 5570, and 5720.

 -
Swage BACS13BX Flareless Sleeves with the 6633K01 Harrison Roller Swaging Kit.

 -Preset BACS13AP Flareless Sleeves.
 -Remove the CRYOLIVE sleeve/coupling nut protective cap assembly from the liquid nitrogen and slide the assembly on to the tube, allowing it to warm to room temperature.

 (d)  
Assemble and tighten the flareless fittings which are part of the repair section (AMM 20-11-05/801).

 (e)  
Measure all of the tube assembly length (L1) (see Fig. 806 and 809).

 (f)  
To find the necessary cutout length (L2) as shown on Fig. 806 and 809, use the procedure given in Fig. 810.

 (g)  
Remove the pressure from the systems where you will do the repairs.

 (h)  
Cut out the damaged tube (L2). Trim the tube ends as shown in Fig. 804.

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 20-11-05
 ALL  ú ú 03 Page 809 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 (i)

(j)

(k)

(l)

(m)

(n)

A
747-400 MAINTENANCE MANUAL
When you make the installation, refer to the applicable section
 as follows:
 1)  To use the Harrison elastomer swager to install BACS13BX flareless sleeves, refer to "Swage the BACS13BX flareless sleeves with the Harrison elastomer swagers 5175, 5570 and 5720".
 2)  To use the 6633K01 Harrison roller swaging kit to install BACS13BX flareless sleeves, refer to "Swage the BACS13BX Flareless Sleeves with the 6633K01 Harrison Roller Swaging Kit."
 3)  To use the Harrison 6777 Roller Swage Machine for installing 35211 sleeves or 35212 unions, refer to "Swage Harrison 35211 sleeves and 35212 unions with the Harrison 6777 Roller Swage Machine.
 4)  To install BACS13AP flareless sleeves, refer to "Preset the BACS13AP Flareless Sleeves".
 5)  If you use H-couplings (BACC42W) for repair, refer to "Install the BACC42W H-coupling".
 6)  If you use Cryofit unions (3P02111 or 3PHS111) for repair, refer to "Install the 3P02111 or 3PHS111 Cryofit Coupling".
 7)  If you use Permaswage unions (D10283) for repair, refer to "Install the Permaswage Fittings".
 8)  To install Cryolive flareless sleeve assembly, refer to "Install the Cryolive Flareless Sleeve Assemblies".
 NOTE: Use only the complete Cryolive flareless sleeve
____ assembly, consisting of a Cryolive sleeve, coupling nut and plastic cap. The Cryolive flareless sleeve assembly, in Sizes 10, 12 and 16, requires use of a longer length coupling nut. The longer length coupling nuts are not interchangeable with standard BACN10- and MS21921 coupling nuts.
　
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