MIL-DTL-46714 Semitrailer Van: Electronic, Tactical, 6-Ton, 2-Wheel, M373A2This specification covers the M373A2 van semitrailer, which is a 6-ton, tactical, 2-wheel, van-type semitrailer having an interior length of 30 feet \(ft\). The semitrailer is primarily used to transport and house electronic processing equipment over all types of roads and limited cross-country terrain and under extreme climatic conditions. These mobile shelters are also used as maintenance shops and command posts \(see 6.1\).

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MIL-DTL-46714E(AT)

4.5.3 Water tightness.

4.5.3.1 Water tightness/rain test on completed van. To determine conformance to

3.3.8.1, each semitrailer body shall be subjected to a two-hour (minimum) spray test to determine

waterproofness of riveted joints, door seals and all other openings. Test shall be conducted after

complete fabrication of the van body with interior installed. The spray shall be delivered by

nozzles operating at a minimum of 55 psi pressure to be determined at a point within three feet of

the most distant nozzle from the water source. Nozzles shall be sufficient in number and placed

within three feet of van body. The spray shall impinge on each seam and door seal with

impingement separated by a distance no greater than one foot. The spray shall impinge on all

areas of the exterior of the van body at angles of 20 to 90� to the surface being sprayed. To

assure total coverage during the spray test, areas not covered by water spray impingement shall

have a continuous flow of water over such areas. During the test, doors shall be closed as in

normal operation without any additional measures taken to improve door sealing. The interior

surface of the clearance marker light lens and tailgate lens shall show no evidence of moisture

penetration.

4.5.3.2 Van body immersion test. To determine conformance to 3.3.8.2, each van body

shall be immersed to a depth of 13 to 13.5 in. above the floor pan. Test shall be conducted after

complete fabrication of the van body and prior to installation of insulation, inner panels, flooring,

paint and perforated sheet metal, if any, but with floor supports in place and windows or vents

above the water lines open to relieve air pressure. With the space between the outer wall and the

fording plates filled to within 1.5 in. of the top, there shall be no evidence of water leakage. If

leaks occur, the van body shall be rejected. This test may be performed with or without

suspension installed. Upon completion or repairs, the van body shall be retested.

4.5.3.3 Water tightness test/van body shell. To determine conformance to 3.3.8.3, during

acceptance testing, each van body (without interior) shall be tested in accordance with the testing

procedure as specified in 4.5.3.1 with the exception that the duration of the test time shall be

45 minutes (minimum) in lieu of two hours.

4.5.4 Performance.

4.5.4.1 Payload, towing speed, and tracking. To determine conformance to 3.4.1, the

semitrailer shall be attached to the towing vehicle and operated as specified. The semitrailer shall

perform without failure.

4.5.4.2 Fording. To determine conformance to 3.4.2, the semitrailer shall be placed in

water of the specified depth for 30 minutes and checked for leakage. Preparation for the fording

operation shall consist of only closing and locking of van body doors. The side van door lock

well shall be observed for water leakage when the van is on side slope (left side of van is facing

upward on slope). The rear van door lock well shall be observed for water leakage when the