MIL-DTL-62164E(AT)
4.5.3.3 Grade and slope operation. To determine conformance to 3.5.3, the semitrailer
shall be operated on 15% grades headed up and down and on 20% side slopes with each side of
the semitrailer up slope.
4.5.3.4 Service brakes. To determine conformance to 3.5.4.1, the brakes shall be
checked for functional operation as specified.
4.5.3.5 Failsafe brakes. To determine conformance to 3.5.4.2, the failsafe brake shall be
checked for proper functioning utilizing the brake and air suspension system controls at the side
of the vehicle.
4.5.3.6 Failsafe release system. To determine conformance to 3.5.4.3, the failsafe brake
release system shall be checked utilizing the release control at the side of the semitrailer to
determine compliance as specified.
4.5.3.7 Turning ability. To determine conformance to 3.5.5, the prime mover shall be
coupled to the semitrailer and the combination shall be driven to the prime mover's minimum
turning circle to the right and to the left, without interference between the prime mover and the
towed semitrailer.
4.5.3.8 Trailing ability. To determine conformance to 3.5.6, when the vehicle is coupled
to the prime mover and operated it shall be observed for trailing ability.
4.5.3.9 Fording ability. To determine conformance to 3.3.3.4, 3.3.3.7, and 3.5.7, the
vehicle shall operate in water to a maximum of 48 in. in depth for at least 15 minutes.
Immediately following the fording test, the vehicle shall be examined for evidence of water leaks
and contamination of seals, and proper functioning of the brakes.
4.5.3.10 Reliability. To determine conformance to 3.5.8, reliability shall be verified at
an 80% confidence level while vehicles are subjected to the 20 000-mile test (see table V).
4.5.3.11 Maintainability. To determine conformance to 3.5.9, maintainability shall be
verified during the 20 000-mile test (see table V). Maintenance shall be performed by the
Government at a Government approved test site.
TABLE V. 20 000 - mile road test. 1/
Course
Mileage and speeds
Payload
Hard surface roads
9000 miles paved at varying speeds
105 000 lbs
up to 34 mph
Secondary roads
10 000 miles at speeds applicable to 105 000 lbs
conditions of terrain
Off-road
1000 miles at speeds applicable to
105 000 lbs
conditions of terrain
1/ Ninety % of the mileage specified for each course shall be performed with payload.
The remaining 10% of the mileage shall be performed without payload. Payloads
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