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 \(see 6.1\).

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22

MIL-DTL-46714E(AT)

front of the van is facing upward on longitudinal slope. This is to be accomplished immediately

after the fording test. The taillight assemblies shall be observed for water behind the lenses

immediately after fording. The wheels shall be removed to determine the presence of water in the

wheel bearings.

4.5.4.2.1 Optional fording test. The completed van body without payload shall be tested as

specified in 4.5.4.2. The van shall be immersed in water to a depth of five feet. End performance

requirements, testing methods, etc., pertaining to the van body shall remain the same.

4.5.4.3 Turning ability. To determine conformance to 3.4.3, the turning ability shall be

checked for performance as specified.

4.5.4.4 Landing gear. To determine conformance to 3.4.4, the semitrailer shall be placed

on firm surface and loaded to rated payload. The landing device and combined leveling

mechanism shall function and perform as specified.

4.5.4.5 Braking. Prior to performance testing as specified in 4.5.4.5.1 and 4.5.4.5.2, the

master cylinder shall be filled to the proper level with silicone brake fluid and the brake system

bled to remove all entrapped air. The brake system shall be adjusted and free of all air bubbles

prior to the start of performance testing.

4.5.4.5.1 Service brakes. To determine conformance to 3.4.5.1, the service brakes shall

be tested for conformance to the performance specified and capability to control, decelerate, and

stop the vehicle shall be verified.

4.5.4.5.2 Automatic brake actuator. To determine conformance to 3.4.5.2, the automatic

brake actuator shall be tested for conformance to the performance specified and capability to

maintain application of the brakes and hold the vehicle stationary on a 20% grade for not less than

15 minutes shall be verified.

4.5.4.5.2.1 Optional test method for conformance testing. The semitrailer without

payload shall maintain application of the brakes and hold the semitrailer stationary on any grade

from 0 to 20% for not less than 15 minutes. Immediately thereafter, the semitrailer shall be towed

and all semitrailer wheels shall skid.

4.5.4.6 Grade and slope operation. To determine conformance to 3.4.6, the semitrailer

shall be attached to the towing vehicle and operated as specified. During the first article testing,

side slope and longitudinal grade testing shall be conducted for not less than 200 ft (400 ft total).

4.5.5 Environmental. To determine conformance to 3.4.7, the semitrailer properly

serviced and equipped shall be operated at the high and low temperatures specified therein.