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Flareless Fitting
PROOF PRESSURE TESTING

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Table 6-4.-Thread Lubricants SYSTEM LUBRICANT Hydraulic Specification MIL-H-5606 Fuel Specification MIL-H-5606 Oil Specification MIL-O-6032 or MIL-L-23699 Freon Specification MIL-L-6085A Pneumatic Specification MIL-G-4343 Oxygen Specification MIL-T-27730A Figure 6-16.—Preset sleeve. cannot be rotated with thumb and fingers. At this point the cutting edge of the sleeve is gripping the tube and preventing tube rotation; the fitting is ready for the final tightening force needed to set the sleeve on the tube. Tighten the nut to the number of turns specified in Aviation Hose and Tube Manual, NAVAIR 01-1A-20. After presetting, unscrew the nut from the presetting tool or flareless fitting body; check the sleeve and tube (fig. 6-16). Sleeve cutting lip should be imbedded into the tube’s outside diameter between 0.003 inch and 0.008 inch, depending on size and tubing material. A lip of tube material will be raised under the sleeve pilot. The sleeve pilot should contact or be quite close to the outside diameter of tube. The tube projection from the sleeve pilot to the tube end should be as listed in table 6-5. The sleeve should be bowed slightly. The sleeve may rotate on tube and have a maximum lengthwise movement of 1/64 inch. The sealing surface of the sleeve, which contacts the Table 6-5.—Tube Projection From Sleeve Pilot TUBE SIZE *APPROXIMATE TUBE PROJECTION-INCHES 2 7/64 3 7/64 4 7/64 5 5/32 6 11/64 8 3/16 10 13/64 12 7/32 16 15/64 20 1/4 24 1/4 32 9/32 *The figures vary upon change of wall thickness for a given size. Do not use these dimensions as an inspection standard but rather as an approximation of proper tube projection. 6-13







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