5) Clearance - Make sure the hose assembly is clear of all other lines, equipment, and adjacent structure under all operating conditions. The hoses must have the minimum clearance specifications shown in Table 2.
~............................................................
| TABLE 2 |
..............................................................
| HOSE CLEARANCE | MINIMUM CLEARANCE |
| TO | (INCH) |
..............................................................
| CONTROL CABLES AND LINKAGES | 1.0 *[1] |
|.............................................................
| CABLE AT PULLEYS | 0.5 |
..............................................................
| CABLE AT MID-SPAN | 2.0 |
|.............................................................
| ELECTRICAL WIRING | 0.5 |
|.............................................................
| HYDRAULIC TUBES OR HOSES | 0.2 |
2..................................….........................1
*[1] Measured at a relative position where the hose is closest
to the cable or linkage.
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 868-406
(2)
Remove pressure from the hydraulic system where you will do the repair (AMM 29-11-00/201).
S 968-407
(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.
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A
747-400 MAINTENANCE MANUAL
(4) S 968-408If 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 428-409Install the flexible hose (AMM 20-11-18/401).
(6) S 868-410Supply the usual operating pressure to the repaired tube.
(7) S 218-411Examine the hose and connections for leaks.
(8) S 228-412Make sure the repair agrees with all specifications for slack, flex, twisting, bending, clearance, and support.
TASK 20-11-05-308-432
13. 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.
Repair 6061-T4 Aluminum Hydraulic Tubing
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