MIL-DTL-62180F(AT)
3.4 Performance. The semitrailers, shall meet performance requirements of this
specification when equipped as specified herein, and serviced with appropriate lubrication oils
and greases (see 6.7) that meet the temperature operational environments and loaded with rated
payload and coupled to the designated prime movers ( M1088, M818 series, and M915 series).
Semitrailers serviced and equipped for existing climatic conditions, shall operate without special
equipment (see 4.5.26).
3.4.1 Environmental operation. Semitrailer shall operate under extreme conditions of
weather in ambient air temperatures ranging from -25 °F to +125 °F. The complete semitrailer,
when in storage, shall withstand a temperature of -80 °F, without deterioration that may cause
failure of any component (see 4.5.26.1).
3.4.2 Payload towing speeds and trailing ability.
3.4.2.1 Highway (paved) and gravel roads payload and speeds. The semitrailer, loaded
with rated payload, shall operate satisfactorily when towed over level, smooth, improved and
prepared hard-surfaced roads and gravel roads at average speeds of the ranges specified in
table IV without damage to semitrailer or prime mover. When loaded and towed at speeds
specified, in a straight line, on a level, smooth, paved surface, the path of the towed chassis shall
not deviate more than 3 in. to either side of the path of the towing vehicle (see 4.5.26.2).
3.4.2.2 Cross-country payload and speeds. The semitrailer loaded with rated payload
shall operate satisfactorily while being towed over unimproved roads, trails, open fields, rolling
hills, and cross-country terrain at sustained speeds without damage to semitrailer or the primer
mover (see table I and 4.5.26.3).
3.4.3 Grade and side slope operation. The semitrailer, with rated load, shall operate
satisfactorily and maintain stability on a 20 percent maximum side slope without leakage of fuel
through the vents. The semitrailer with rated payload shall operate on a 10 percent maximum
longitudinal slope without leakage of fuel through the vents. NOTE: The semitrailer's full load
will be adjusted so that there is no leakage of fuel through the manhole cover vent, on
longitudinal slopes in excess of 10% (see 4.5.26.4).
3.4.4 Brake holding ability.
3.4.4.1 Service brakes. The combined service brakes of the tanker and towing vehicle
shall, under all conditions of loading, bring the combination to a stop in accordance with
49CRF393.52 (see 4.5.26.5).
3.4.4.1.1 Automatic brake actuation. Tankers shall be equipped with an automatically
actuated device to apply the tanker brakes upon breakaway from the towing vehicle. With
semitrailer rated payload adjusted for satisfactory operation on a 20 percent longitudinal slope,
the automatically actuated device shall apply the semitrailer brakes upon emergency line
break-away from the towing vehicle, and shall maintain application of brakes for not less than
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