(5)
Tubing clearances
(6)
Tubing clamp spacing.
B. Remove and install all flareless tubing as told in this procedure. Identify the system, the tubing assembly configuration, and the tubing material before removal.
C. When you disconnect tubing, always obey necessary precautions to prevent leakage of fluids. If fluid falls on the airplane, identify the fluid and clean the area as applicable (Ref Chapter 12, Cleaning and Washing).
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 locations.
(2)
Do not move or change the tube bends. If you move or change a 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 a 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 nuts and fittings again if the seal areas give a good seal on the assembly. Also make sure the threads turn smoothly and the hex corners are not worn.
NOTE: It is recommended that titanium or steel fittings be use 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. Incorrectly preset flareless BACS13AP sleeves can cause leaks. We recommend that you preset flareless sleeves by machine. Preset by hand only where you cannot preset by machine because of the tube configuration or because you cannot get access to the flareless sleeves.
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747-400
MAINTENANCE MANUAL
G. When you install tubing, align the fittings and tubing to permit you to hand tighten the B-nuts before you wrench tighten them. Do not use fitting nuts to align tubing and connections.
NOTE: If you use the nut to "stretch" or align the tubing to make the
____ sleeve touch the mating surface, you will put too much force on the preset, swaged, or welded sleeve and tube end. This force adds to the risk of leakage, blowoff, and other failures.
TASK 20-11-05-054-021
2. Flareless Tubing Assembly - Removal
___________________________________
A. References
(1)
AMM 35-00-00/201, Oxygen
B.
Procedure
S 804-038
WARNING: REFER TO AMM 35-00-00 FOR OXYGEN MAINTENANCE PROCEDURES.
________
MAINTENANCE CAN CAUSE INJURY OR DAMAGE.
(1) Refer to AMM 35-00-00 before you do work on the oxygen system.
S 014-039
WARNING: REMOVE ALL PRESSURE FROM THE SYSTEM AS SPECIFIED IN THE
_______ APPLICABLE MAINTENANCE INSTRUCTIONS BEFORE YOU START REMOVAL OF THE FLARELESS TUBING ASSEMBLY. A PRESSURIZED SYSTEM CAN CAUSE INJURY.
(2)
Get access to the tube assembly fittings.
S 034-003
(3)
Remove the support clamps on the tubing you will remove and on the adjacent tubing assemblies as necessary.
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747-400 MAINTENANCE MANUAL
S 934-041
WARNING: MAKE SURE EACH TUBE AND THE PORT FITTING 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 THIS OCCURS, UNINTENTED OPERATION OR MALFUNCTION OF AIRPLANE SYSTEMS CAN RESULT AND CAUSE INJJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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