MIL-DTL-62049G
permanent deformation. The semitrailer shall track the towing vehicle within 2 inches to each
side of its path when it is moving in a straight line (see 4.5.2 and 4.5.10.5).
3.6.6 Turning ability. The semitrailer when coupled to the towing vehicle, shall be
capable of making complete turns to the right and to the left with the semitrailer assuming a
90° angle to the towing vehicle without cramping, side slipping, or damage to either the towing
vehicle or the semitrailer (see 4.5.2 and 4.5.10.6).
3.6.7 Landing device. The landing device and combined leveling mechanism shall
support the fully loaded semitrailer. The landing device shall withstand, without damage, the
strains imposed upon it when coupling or uncoupling the towing vehicle, and raising or lowering
the fully loaded semitrailer (see 4.5.2 and 4.5.10.7).
3.6.8 Watertightness/rain. Each semitrailer body shall be waterproof to provide a
watertight structure. The installed door assembly shall provide a watertight seal. The interior of
the semitrailer shall show no evidence of water leakage or moisture penetration from any cause
(rain, road splash, etc.). The interior of the semitrailer includes the space between the outer wall
skins and interior. Semitrailer watertightness requirements are applicable prior to and after
exposure to all of the requirements specified herein (see 4.5.10.8).
3.6.9 M313, M447, and M750 models of semitrailers.
3.6.9.1 Heaters interface. Provision shall be made for heater installation. Interface
connections shall be provided for electrical wiring, plumbing, and exhaust in accordance with
applicable drawings. The unit shall operate from a 120 Vac, 60 Hz, single-phase electrical
source (see 4.5.2, 4.5.10.9.1 and 4.5.10.9.2).
3.6.9.2 Lightproofness. Light from the semitrailer interior (with all interior lights
operating) shall not be visible within a 50-foot radius of the vehicle (see 4.5.2 and 4.5.10.10).
3.6.9.3 Air conditioner interface for M313 and M447C models. Provisions shall be
made for air conditioner installation. Interface connections shall be provided for electrical
wiring and the condensate drain in accordance with applicable drawings. The unit that will be
installed shall have a cooling output capacity of not less than 36 000 British thermal units (Btu)
per hour and operate from a 208 Vac, 60 Hz, 3-phase electrical source (see 4.5.2, 4.5.4.1, and
4.5.10.9.1). However, the contractor shall not use an ozone-depleting chemical (ODC) as the
refrigerant.
3.6.10 Gradeability.
3.6.10.1 Longitudinal grades. The semitrailer, loaded with the cross-country payload
(see 4.5.8.1), shall follow the towing vehicle at a sustained speed of 20 mph without sliding,
shifting, or deviating more than 3 in. to either side of the path of the towing vehicle when
ascending and descending 20 percent longitudinal grades (see 4.5.11.1).
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