20-10-51
ALL ú ú 02 Page 834 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
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.
(2) S 868-253Remove pressure from the hydraulic system where you will do the repair (AMM 29-09-00).
(3) S 968-254If 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.
(4) S 968-255If 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.
(5) S 428-256Install the flexible hose (AMM 20-10-10/401).
(6) S 868-257Supply the usual operating pressure to the repaired tube.
(7) S 218-258Examine the hose and connections for leaks.
(8) S 228-259Make sure the repair agrees with all specifications for slack, flex, twisting, bending, clearance, and support.
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20-10-51
ALL ú ú 04 Page 835 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
TASK 20-10-51-308-274
12. Repair 6061-T4 Aluminum Hydraulic Tubing_________________________________________
A. General
(1)
This is a repair method that applies only to 6061-T4 aluminum hydraulic tubes in Sizes 16 (1 inch) and 20 (1-1/4 inch) and uses 6061-T4 aluminum tube material. 6061-T6 material may be used as as alternate material for repair of 6061-T4 aluminum hydraulic tubes but 6061-T4 aluminum tube material may NOT be used to repair 6061-T6 aluminum hydraulic tubes.
(2)
Repair is accomplished using only the BACS13BX sleeve, the elastomer swaging process and other applicable methods specified in this MM for flareless tube repairs. No tube-to-tube fitting repairs are approved for 6061-T4 aluminum hydraulic tube.
B.
References
(1)
AMM 20-10-51/401, Flareless Tubing - Removal/Installation
(2)
AMM 20-50-11/201, Standard Torque Values
C.
Repair 6061-T4 Aluminum Hydraulic Tubing
S 308-271
(1) Do the repair:
(a)
Decide if a tube splice is necessary or if the damage is small enough to repair by installing a flareless MS21902 union between two BACS13BX sleeves.
(b)
Refer to (Fig. 805) to find the necessary tube cutout length when you use a single flareless MS21902 union to replace a damaged tube area.
(c)
To use assembled tube ends or a center section to do a repair, find the cutout length and install as follows: 1) Make an estimate of the total length (L1) of the repair
section necessary to replace the damaged tube (Figs. 806, 809).
2) Cut and trim the repair tube as follows: (Fig. 804) a) Use the correct size ratchet chipless cutter. b) Turn the cutter drive screw counter clockwise to
retract the cutter wheel.
c) Put the cutter over the tube.
d) Turn the screw clockwise until the cutter touches the
tube at the necessary cut location.
e) Turn the cutter screw 1/8 to 1/4 turn and rotate the cutter until the cutter is easy to rotate. The tube should now be cut.
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