20-10-47
 ALL  ú ú 01 Page 204 ú Mar 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FLARELESS TUBING ASSEMBLY - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  This procedure contains six tasks:
 (1)  
The first task is to remove the flareless tubing assembly.

 (2)  
The second task is to install the flareless tubing assembly.

 (3)  
The third task is electrical resistance specifications in the fuel tank.

 (4)  
The fourth task is the installation of flareless fittings in pressurized areas, fuel tanks or cargo areas.

 (5)  
The fifth task is tubing clearances.

 (6)  
The sixth task is tubing spacing.

 B.  This procedure is used to remove and install all flareless tubing. The tubing assembly configuration and the tubing material must be identified before removal.
 C.  When you disconnect the tubing, always use the necessary precautions to prevent leakage of fluids. If fluids fall on the airplane, identify the fluid and clean the area as specified for that fluid (Ref Chapter 12, Clean and Polish).
 D.  When you remove, install, or do work with hydraulic tube assemblies, obey the guidelines that follow.
 (1)  
When you remove tubes, make sure the tubes and port fittings have tags that identify the correct connection location.

 (2)  
Do not move or change the tube bends. If you move or change the bend in the tube, these bad effects can occur:

 (a)  
If you move or change a bend in the tube, it can become possible that the tube will align with the incorrect port. If this occurs, incorrect reconnection or cross-connection of the tubes can become possible.

 (b)  
If you move or change the bend in the tube, it can be possible that the tube will have too much stress when it is connected. Stress can cause cracks in the tubes.

 E.  You can use the nuts and fittings again if the seal areas give a good seal on the assembly. Also, the nuts and fittings can be used again if they are not damaged. The threads on the nuts and fittings must turn smoothly.
 NOTE: It is recommended that titanium or steel fittings be used as
____ replacements for aluminum fittings in the high pressure and normal brake return systems between the antiskid module and parking brake module. Titanium or steel fittings may be used as replacements for aluminum fittings in other systems.
 F.  Flareless BACS13AP sleeves that are not correctly set can cause leaks. It is recommended that flareless sleeves be set by machine. Set the flareless sleeves by hand only when you cannot set them by machine.
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 20-10-51
 ALL  ú ú 01 Page 401 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 G.  Align the fittings and tubing until you can turn the B-nuts by hand before you tighten them with a wrench. Do not use the fitting nuts to align the tubing and connections.
 NOTE: If you use the nut to increase the length or to align the tubing,
____ move the sleeve until it touches the mating surface. Leakage from the fittings or the tubing can occur if you cause damage to the fittings or the tubing.
 TASK 20-10-51-004-001
 2.  Flareless Tubing Assembly - Removal___________________________________
 A.  Procedure
 S 034-002
 WARNING: REFER TO THE APPLICABLE MAINTENANCE INSTRUCTIONS AND REMOVE ALL
_______ PRESSURE FROM THE SYSTEM. IF PRESSURE IS NOT REMOVED, INJURY OR DAMAGE CAN OCCUR.
 (1)  
Remove the support clamps on the tubing to be removed and on the adjacent tubing assemblies if it is necessary.

 S 034-003

 (2)  
Loosen the adjacent tubing assemblies and clamps if it is necessary.

 S 934-039
 WARNING: MAKE SURE EACH TUBE AND THE PORT FITTINGS HAVE TAGS TO IDENTIFY
_______ THE CORRECT INSTALLATION LOCATION. IF YOU DO NOT PUT TAGS ON THE TUBES AND PORT FITTINGS, CROSS-CONNECTION OF THE TUBES CAN OCCUR DURING INSTALLATION. IF THE TUBES ARE CROSS-CONNECTED, UNINTENDED OPERATION OR MALFUCTION OF AIRPLANE SYSTEMS CAN RESULT AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
　
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