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MIL-S-62076B(AT)
placed in the travel position, the landing gear legs shall remain positively locked. The landing
gear shall be protected to preclude the entrance of foreign matter which would impair its
functioning or mechanical efficiency. The semitrailer unit, loaded to its gross weight rating
(see 3.2.3.1), shall not nose over when resting on the landing gear.
3.4.7.1 Range of adjustment. The landing gear shall have a range of adjustment sufficient
to vary the height of the upper fifth wheel plate at the kingpin from 46 inches to not less than
54 inches from the ground. The minimum ground clearance with the landing gear retracted shall
be 12 inches at a 48-inch upper fifth wheel plate height.
3.4.8 Rear end protection. Semitrailer unit rear end protection shall be provided in
accordance with Federal Motor Carrier Safety Regulation 393.86.
3.4.9 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 rub rails (unless recessed and fully protected) or on the semitrailer
bumper. Turn signal lamps conforming to SAE J588 shall be furnished at the rear of the
semitrailer. All electrical wiring shall conform to SAE J1292. Clearance and identification
lights shall be constructed for easy removal and replacement of lamps and lenses without the use
of hand tools.
3.4.9.1 Receptacle 12-volt. The front of the semitrailer chassis shall be equipped with a
7-contact receptacle conforming to SAE J560 with the connectors connected and color coded as
specified therein. The receptacle shall be provided with a spring loaded cover. The receptacle
shall be located in accordance with SAE J702.
3.4.9.2 Twelve-volt direct current (dc) system. A 12-volt dc lighting system conforming to
3.4.9 and 3.4.9.1 shall be provided. The 12-volt dc lighting system shall conform to Federal
Motor Carrier Safety Regulations 393.14, 393.20, 393.22, 393.23, 393.25 through 393.29,
393.32, and 393.33.
3.4.9.3 Independent 24-volt dc system. When specified (see 6.2), a 24-volt dc lighting
system, independent of the 12-volt dc lighting system, shall be provided. Separate wiring and
bulbs shall be provided for the 24-volt dc system. The system shall conform to 3.4.9. The
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