20-10-09
ALL ú ú 01 Page 407 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
TASK 20-10-09-404-020
5. Installation of Flareless Fittings in Pressurized Areas, Struts, Fuel Tanks,
____________________________________________________________________________ or Cargo Areas
______________
A. Procedure
S 434-021
(1) Tighten the flareless fittings with the BACS13AP sleeves two times (tighten, loosen, and tighten again).
NOTE: Be careful to make sure that the fittings will not have leaks
____
after you tighten the fittings.
(a) Tighten the flareless fittings with BACS13BX, BACS13BD, welded-on, or NAS1760-type sleeves as follows: 1) Tighten the fitting to the torque shown in Fig. 403. 2) Loosen the fitting to release the torque. 3) Tighten to the torque value specified in Fig. 406.
NOTE: Be careful to make sure the fittings will not have
____ leaks after you tighten the fittings.
S 764-022
(2)
For installation of the wing fuel tank, use the procedure, Electrical Resistance Specifications in the Fuel Tank.
S 354-023
(3)
Make the necessary repairs. Use the procedure in Flareless Tubing Assembly - Approved Repairs (20-10-09/801).
S 794-024
(4)
Do a leak test on the repair installations of the flareless fittings in pressurized areas:
(a)
Pressurize the system for 15 minutes minimum.
(b)
With the system pressurized, do a check on the tube-to-fitting interface for signs of hydraulic leakage. Use a clean white cloth to find hydraulic leakage.
NOTE: You can tighten the tube again to the specified torque
____ value shown above, if you find leakage. If leakage occurs in subsequent leak tests, you must replace the repair installation.
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20-10-09
ALL ú ú 01 Page 408 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 714-047
(5) If you disconnected more than one hydraulic tube and you think there is a possibility you connected the tubes incorrectly or cross-connected the tubes, do an operational check:
NOTE: Use your own judgement to determine if a check is necessary.
____
(a) Do the post-installation test of one or more of the components to which the tubes are connected as a check.
S 714-048
(6) If you disconnected electrical wires to get access to the tubes and you think there is a possibility you connected the wires incorrectly or cross-connected the wires, do an operational check:
NOTE: Use your own judgement to determine if a check is necessary.
____
(a) Do the post-installation test of one or more of the components to which the wires are connected as a check.
TASK 20-10-09-224-025
6. Tubing Clearances_________________
A. Clearances
S 224-041
(1) The minimum clearance for all mechanical systems except hydraulic tubing will be from adjacant structure, fixed structure, fixed and moving equipments and other tubing and fitting connectors will be as follows:
(a)
Supported locations 0.10 inch
(b)
Unsupported locations 0.20 inch
(c)
Supported and unsupported locations for flammables gas, fuel, and oxygen systems will be 2.0 inches from electrical wires and cables.
S 224-040
(2) Minimum clearance for hydraulic system.
(a)
A minimum 0.06 inch for tubes supported to structure or other rigid members.
(b)
A minimum of 0.25 inch with adjacent structure, tubing or connectors, or other installations.
(c)
A minimum of 0.25 inch in areas where relative motion of adjoining components exists.
(d)
A minimum of 0.06 inch between individual coils of all coiled tubes.
(e)
A minimum of 0.05 inch between electrical wiring installations.
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