MIL-S-4953C(USAF)
3.5 Materials.
3.5.1 Protective treatment. When materials are used in the construction of the spray outfit that are subject to deterioration when exposed to climatic and environmental conditions likely to occur during service usage, they shall be protected against such deterioration in a manner that will in
no way prevent compliance with the performance requirements of this specification. The use of any protective coating that will crack, chip, or scale with age or extremes of climatic and environmental conditions shall be avoided.
3.5.2 Metals. Metals shall be of the corrosion-resistant type or shall be suitably protected to resist corrosion during normal service life.
3.5.3 Dissimilar metals. Wherever possible, contact with aluminum or magnesium alloys shall be avoided. Wherever such contacts are unavoidable, they shall be properly insulated. Dissimilar metals are defined in MS33586.
3.6 Design and construction.
3.6.1 The spray outfit shall be designed to apply a hot corrosion-preventive mixture or hot preoiling fluid under hydraulic pressure to the internal parts of aircraft engines by means of a spray gun or preoiling adapters.
3.6.2 The spray outfit shall be constructed so that no parts will work loose in service. It shall be built to withstand the strains, jars, vibrations, and other conditions incident to shipping, storage, installation, and service.
3.6.3 Any design which renders servicing, adjustment, or replacement unduly difficult or repeatedly necessary under field conditions shall not be acceptable.
3.6.4 All screws, pins, and bolts shall be furnished with standard locking devices. Safety wire, self-locking nuts, cotter pins, and lockwashers will be acceptable.
3.6.5 The spray outfit shall be a rigid, compact, self-contained unit adequately protected from severe stresses or distortions normally encountered in shop, station, base, or field transportation. The spray outfit shall be equipped with four wheels and automotive-type axles. Two springs shall be furnished on each axle to adequately support the fully loaded spray outfit under all conditions specified herein. The wheels with tires and hubs, size 6.00-9, shall conform to MIL- W-8005. The tread width shall be 49 inches. Knuckle-type steering incorporating tie rods and kingpins shall be provided on the trailer to provide a high degree of maneuverability. Adequate means for lubrication shall be provided. The cramping angle shall be not less than 40 degrees. A hinged tow bar, 3 feet in length, shall be provided and fitted with a lunette eye conforming to MS51336. A locking device shall be provided to hold the tow bar in a stowed position.
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