MIL-S-62101C
Supports for the crank extension shaft and clips for holding the crank when folded shall be provided. Each leg shall be equipped with a steel landing pad. Each pad shall provide an area not less than 100 square inches. Landing legs shall be located on each side at the rear of the gooseneck. Each leg shal1 be capable of supporting its portion of the fully loaded semitrailer and shall be adequately braced to the lowest extremity of the fixed portion of each leg. The landing gear shall be protected to prevent the entrance of foreign matter which would impair its function or mechanical efficiency. The maximum cranking effort to raise the fully loaded semitrailer shall be not greater than 100 pounds.
* 3.13.1 Range of adjustment. The landing gear shall have a range of adjustment sufficient to vary the height of the upper fifth wheel plate from 47 inches to not less than 53 inches from
the ground for size 15, 20 and 22 trailers, and from 50 inches to not less than 56 inches from the ground for size 25 and 30 trailers. Minimum ground clearance with landing gear retracted shall
be 10 inches.
* 3.13.2 Air powered landing gear. When specified (see 6.2), in addition to the requirements of 3.13 and 3.13.1 (less hand crank, etc.), the landing gear shall be air powered. The air powered landing gear system shall include a control box equipped with a 12-volt direct current (dc) motor driven pump, master control valve, leveling valve, booster, main oil tank, air side oil tank, key switch and mounting hardware.
* 3.14 Landing supports. When specified (see 6.2), landing supports shall be furnished in lieu of landing gear. Landing supports shall consist of two legs of the gravity telescopic type, capable of being fixed in various positions. Each leg shall be equipped with a steel landing pad. Each pad shall provide an area not less than 100 square inches.
3.14.1 Range of adjustment for landing supports. Landing supports shall have a range of adjustment sufficient to vary the height of the upper fifth wheel plate from 47 inches to not less than 53 inches from the ground for size 15, 20 and 22 semitrailers, and from 50 inches to not less than 56 inches from the ground for size 25 and 30 semitrailers. Landing support adjustment shall be in not more than 2-inch increments. Minimum ground clearance with landing supports retracted shall be 14 inches.
* 3.15 Lubrication systems. All moving parts normally requiring lubrication shall be provided with accessible pressure grease fittings. Pressure type lubrication fittings shall be readily accessible for servicing and shall conform to SAE J534. Pressure relief fittings shall be used where high pressure lubricating equipment could cause damage to seals.
* 3.16 Lighting. All lights and reflectors shall be protected from operational hazards by mounting in recessed or otherwise guarded locations. Lights and reflectors shall not be mounted on vertical surfaces of the rub rail (unless recessed and fully protected), or on the semitrailer
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