MIL-DTL-45150L
3.4.11 Automatic brake actuation. An automatically actuated device shall apply the
chassis brakes upon breakaway from the towing vehicle, and shall maintain application of brakes
for not less than 15 minutes (see 4.7.8.1).
3.4.12 Payload, towing speeds, and trailing ability.
3.4.12.1 Highway (paved) and gravel roads, payload and speeds. When loaded, the
chassis shall be towed over relatively level, smooth, improved, and prepared hard-surfaced roads
and gravel roads at average speeds specified in table I, without damage to chassis 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. When the payloads for trailers M514, XM545, M390, M390C, M536 and M537
are simulated, the loads shall be uniformly distributed to result in 450 to 550 pounds (lb) of static
weight over the lunette (see 4.7.9).
3.5 Support and ownership requirements.
3.5.1 Safety chains. The trailer shall be equipped with two safety chains and shall not
malfunction (see 4.8.1).
3.5.2 Durability.
3.5.2.1 Chassis with rated payload. Except as specified in 3.5.2.2, chassis with rated
payload shall possess not less than 0.60 probability of completing a minimum of 6000 miles of
operation without experiencing a failure of principal components or subassemblies. This shall
include, suspension (including springs, axles and wheels), brake systems, landing device, leveling
jacks (when specified), lunette and frame. Operation shall be conducted in accordance with
parameters of table II and shall be apportioned as per table II (see 4.8.2).
TABLE II. 6000 mile test, loaded as specified in table I.
Chassis
Course
Mileage and speeds
payload
Hard-surfaced roads
2400 miles at varying speeds
Highway
up to maximum.
Gravel and dirt roads 1500 miles at varying speeds
Highway
up to maximum.
Level cross-country
1380 miles at varying speeds
Cross-country
up to maximum.
Hilly cross-country
600 miles at varying speeds up
Cross-country
to maximum.
Belgian block
120 miles at speeds applicable
Cross-country
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