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|  MIL-S-62549(AT)
3.2.3.1 Frame reliability. The frame reliability shall have a design requirement of 150,000 mi
average frame life which may be demonstrated by analytical calculations.
3.2.4 Maintainability. The total maintenance time, excluding driver and crew checks and
services shall not exceed 8 manhours during 6,000 mi of specified operation. This equates to a
maintenance ratio (MR) of 0.04 at 30 mi of operation equivalent to one hr of operation. The
scheduled maintenance interval shall be six months or 6,000 mi. Any of these conditions that
cannot be corrected by the crew in one hr using BII is considered to be a failure. Maintenance
and human induced failures are excluded.
3.3 Materials. Material used in the manufacture of the vehicle shall be new and of highest
commercial quality as normally used for this type of equipment, considering strength, durability,
ductility, best engineering practice and the purpose for which the equipment is to be used; and
shall be as specified, where applicable.
3.3.1 Recycled, virgin, and reclaimed materials. There are no requirements for the exclusive
use of virgin materials. The use of recycled or reclaimed (recovered) materials is acceptable
provided that all other requirements of this specification are met (see 6.3.1).
3.3.2 Dissimilar metals. Dissimilar metals shall be electrically insulated from one another to
minimize or prevent galvanic corrosion.
3.4 Design and construction. The semitrailer, lowbed shall be a tactical support mobility
vehicle with a payload rated at 80,000 lb capacity and shall have a folding gooseneck which shall
be operated by a winch and cable from the truck-tractor. The operation of the gooseneck will be
designed to permit one-man operation for loading and unloading various types of construction
equipment. The semitrailer shall not exceed the Passe-Partout International (PPI) clearance
dimensions specified in figure 1.
3.4.1 Weights and dimensions. The semitrailer, without payload, resting on level ground and
with the platform level, shall conform to the weights and dimensions specified below:
a. Payload rating
40 ton
b. Maximum overall width,
120 in
with outriggers
c. Maximum reducible width,
96 in
with outriggers folded
d. Minimum length of center bed (Load)
18 ft
e. Maximum height of deck (Load bed)
40 in
f. Minimum ground clearance (Load bed)
12 in
g. Maximum curb weight
19,500 lb
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