MIL-DTL-45150L
trailer parking brakes. Move prime mover to provide clearance between pintle and lunette and set
prime mover brakes. Any movement at pintle/lunette couple shall cause for rejection.
4.7.8.1 Automatic brake actuation. The fully loaded trailer, coupled to prime mover,
shall be parked on a 15% grade. With prime mover brakes applied, disconnect air lines to trailer,
allowing actuator to engage trailer brakes. For inertia brake systems, engage trailer brakes by
pulling breakaway chain. The prime mover is to be moved to provide clearance between pintle
and lunette so that trailer movement is possible. Reset prime mover brakes; trailer must remain
stationary for 15 minutes. Any movement prior to 15 minutes shall constitute test failure.
Perform this test both uphill and downhill.
4.7.9 Highway operation. The chassis shall be loaded with the highway rated payload, or
with a simulated load of equal weight, uniformly distributed over load area. The chassis shall be
operated as specified on paved and gravel roads and observed for towing and performance
requirements. Any sign of damage to the chassis or prime mover, or any deviation more than 3 in.
to either side of the path of the towing vehicle shall constitute a failure and cause for rejection.
4.8 Support and ownership requirements verification.
4.8.1 Safety chains. The two safety chains per trailer shall conform to
FMCSR 393.70(d). Any variance to FMCSR 393.70(d) shall cause for rejection.
4.8.2 Durability (chassis with and without payload). The durability requirement will be
verified at a 50% confidence level by subjecting two chassis each to the 6000 mile test (utilizing
the binomial distribution, no durability failures for two vehicles are allowed to meet this
requirement).
4.8.3 Safety standards. The vehicle and all furnished accessories shall comply with all
FMVSS and FMCSR in effect on the date of manufacture.
4.9 Operating environment requirements.
4.9.1 Environmental operation. When specified (see 6.2), the conformance shall be
determined by operating the chassis in temperatures ranging from -50 to 125ºF, and storing it at
-80ºF. The chassis shall evidence no damage as a result of such operations or storage.
4.9.2 Corrosion protection. A material sample shall be capable of meeting or exceeding
the corrosion resistance provided by a galvanized sample (as described in 3.6.2) when subjected
to the Mandrel Bend Test of ASTM D522, and followed by the Accelerated Corrosion Test of
GM 9540P, Method B, 120 cycles.
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