NOTE : Area A is defined as follows L = 2.5 times the hose outer diameter
____
at both ends of the hose. Area B is the length between the two
Areas A
E. Tears in fire sleeve material area A
F. Tears in fire sleeve material area B
7. Tube mechanical joints (ferrules) for:
A. Wear on end face
B. Nicks, dents and scratches on end face Not serviceable
1 per hose section if the depth is not morethan 0.010 in. (0.25 mm) and total area is not more than 0.40 in.2
(10.2 mm2)
Any amount when O-ring retention flange is not deformed.
Any amount when O-ringretention flange is notdeformed after removal of high metal.
Replace hose.
Replace hose.
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Subtask 72-00-00-917-052
B. If necessary, replace the damaged tube as follows: WARNING : DO NOT PERMIT THE FUEL TO TOUCH YOUR SKIN OR CLOTHES. REMOVE
_______ YOUR CLOTHES IF THE FUEL TOUCHES THEM. RINSE YOUR SKIN FULLY WITH WATER WHERE THE FUEL TOUCHED YOU. FUEL CAN BURN YOUR SKIN.
(1) Disassemble the connection. NOTE : Tubes can have oil or fuel in them as they are removed. Drain
____
the fluid into a container.
(2) Install protective closures and protective caps on drilled passages, fuel lines, oil lines, air lines and open engine ports when parts are removed.
(3) Use protection on the machined surfaces to prevent damage.
(4) Remove and discard O-ring, if necessary.
(5) Remove and do an inspection of the gaskets or seals, if necessary (Ref. TASK 70-21-00-918-002).
(6) Do an inspection of the mating and threaded surfaces for cleanliness, contamination, scratches, dents, or other surface defects.
(7) Do an inspection of the tube for satisfactory general condition and make sure that no damage has occurred.
(8) Remove the closures and caps used for protection immediately before installation.
R (9) Lubricate new O-rings with vaseline (Material No. CP5070).
(10) Apply a thin layer of engine oil (Material No. CP2442) to the gaskets and seals.
(11) Install new O-rings, or serviceable gaskets, or seals, as necessary.
(12) Install the tube but do not use force. A small elastic distortion is permitted to engage the connections.
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(13) Tightening method:
CAUTION : USE 2 WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS.
_______ ONE WRENCH TO HOLD THE UNION AND ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT. THIS WILL PREVENT DAMAGE TO THE HARDWARE.
(a) Tighten all end fittings and clamps with your hands. After a system is installed, torque the clamps first, then torque the end fittings.
(14) Do not chafe tubes when you install the clamps. Attach the tube loosely with a clamp and position the tube to get the best clearance, then tighten the clamps.
(15) Use the correct size clamps for the tube you install
(16) Make sure there is clearance between the tube and each adjacent part. Correct minimum clearances are given in the table that follows:
-------------------------------------------------------------------------------
MINIMUM AFFECTED EQUIPMENT CLEARANCE REMARKS -------------------------------------------------------------------------------
STRUCTURE: 0.25 in. Not less than 0.06 in. Frames, bolts, (6.4 mm) (1.5 mm) clearance in rivets, webs, etc. 1 in. (25.4 mm) or
less of clamping points
MECHANISM: 0.5 in. Keep the clearance
Actuators, linkages, etc. (12.7 mm) during the full travel of the mechanism
GROUPED TUBING: 0.19 in. Clamp lines that Parallel runs, (4.8 mm) go across each other intersections, to get minimum etc. clearance of 0.12 in.
(3.0 mm) -------------------------------------------------------------------------------
(17) Coupling nuts must turn freely by hand.
(18) The mating surfaces of the flanges of the tube must be installed at 90 degrees to each other.
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