6) Support - Make sure the hose assembly has supports that do not cause deflection of rigid lines because of the relative motion that can occur. Use sufficient clamps to follow the contour of the structure to prevent hose abrasive wear, kinking, and entanglement during flexing. At a minimum, put clamps at locations where the tube clamps were.
Make sure the hose is not rigidly supported by tight, rigid clamps around its outer diameter. If a hose between rigid connections must move longitudinally, clamps must be of a type that will not cause wear on the hose casing. Make sure the connections have supports at the tube, not at the hose.
S 868-345
(2)
Remove pressure from the hydraulic system where you will do the repair (AMM 29-11-00/201).
S 968-346
(3)
If you can replace all of the damaged tube with a flexible hose, do these steps:
(a)
Remove the damaged tube.
(b)
If necessary, prepare the ends of the tubes to which you will install the flexible hose. Use the applicable fittings as shown in the Tubing Repair paragraph.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-10-09
ALL ú ú 01 Page 833 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 968-347
(4) If the damaged tube is too long to replace by a flexible hose, do the steps that follow:
(a)
Cut out the damaged tube section to accept the flexible hose.
(b)
Prepare the ends of the cut tube with the applicable fittings as told in the Tubing Repair paragraph.
S 428-348
(5)
Install the flexible hose (AMM 20-10-10/401).
S 868-349
(6)
Supply the usual operating pressure to the repaired tube.
S 218-350
(7)
Examine the hose and connections for leaks.
S 228-351
(8)
Make sure the repair agrees with all specifications for slack, flex, twisting, bending, clearance, and support.
TASK 20-10-09-208-352
12. Aluminum Fuel Tubes - Temporary Weld Repair Method
__________________________________________________
A. General
(1)
This is a temporary repair method approved for 6061 and 5052 aluminum fuel system tubing, and is applicable only to tubes with wear-through damage, cracks, or punctures.
(2)
Repair is accomplished with tubing removed from airplane.
B. Consumable Materials
(1) B01000 Solvent, Series 80
(2) B01008 Solvent, Series 88 ú C. Aluminum Fuel Tube Temporary Repair ú ú S 018-368 ú ú
CAUTION:_______REPLACE THE TEMPORARILY REPAIRED TUBE WITH A NEW SECTION OF ú TUBE WITHIN A MAXIMUM OF 250 FLIGHT HOURS. IF YOU DO NOT ú REPLACE THE TUBE, DAMAGE COULD OCCUR. ú
(1) Remove aluminum fuel tube to be repaired by referring to applicable maintenance manual removal and installation procedure.
S 118-354
CAUTION:_______FULLY CLEAN THE TUBING. IF YOU DO NOT CLEAN THE TUBING, THE WELD CAN GET CONTAMINATED AND THE WELD QUALITY DECREASES.
(2) Completely clean the inner and outer surfaces of all the tube section with solvent, Series 80 (AMM 20-30-80/201).
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