MIL-DTL-46714E(AT)
penetration from any cause (rain, road conditions, splash, etc.). The interior of the semitrailer
includes the space between the outer wall skins and the interior panels. This requirement is
applicable prior to and after exposure to all of the requirements specified herein (see 4.5.3.1).
3.3.8.2 Immersion (van body shell). When immersed in water to a depth conforming to
the completed trailer fording requirement of 5 feet, the van shall show no water leakage.
Specifically, the inboard surface of the doors, door seals, floor pan or any other surface visible
from within the van shall show no moisture penetration or leakage (see 4.5.3.2.)
3.3.8.3 Water spray (van body shell without interior). When subjected to a water spray,
all visible inboard/inside surfaces of the van shall show no moisture penetration or water leakage
during or after the spray period (see 4.5.3.3).
3.4 Performance. The semitrailer when properly lubed and serviced and towed by a
compatible prime mover shall meet the performance requirements specified herein when the
vehicle is operated under the road/terrain, course and speed conditions specified in table I. The
rated payload is 12 000 lbs and evenly distributed.
3.4.1 Payload, towing speed, and tracking. When towed at the speeds specified in table I,
over the roads and terrains specified therein, the semitrailer shall be capable of transporting the
rated payload without failure, permanent deformation, or damage. The semitrailer shall track the
towing vehicle within 2 in. to each side of the path of the towing vehicle when the towing vehicle
is moving in a straight line (see 4.5.4.1).
TABLE I. Road/terrain, course and speed requirements.
Course
Speed (mph) 1/
Road and terrain type
distance
Maximum Minimum
Hard-surfaced (paved) roads
2400 miles
55
50
Gravel and dirt (secondary) road 1620 miles
30
20
Level cross-country terrain
1500 miles
30
10
Hilly cross-country terrain
360 miles
30
10
Belgian block
120 miles
20
15
Side slope, 20%
200 ft
5
3
Longitudinal slope, 20%
200 ft
5
3
1/ Speed may vary between the maximum and minimum speed allowed based on
terrain/environmental conditions and determined safe by the operator of the prime
mover.
3.4.2 Fording. With doors closed, the semitrailer shall be capable of fording hard-bottom
water crossings to a depth of 5 ft without the entrance of water or moisture penetration into the
interior of the van, including the personnel/equipment area of the van body, the sealed taillight
assemblies, and the sealed wheel bearings. No entrance of water leakage into the personnel/
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