MIL-DTL-62073H(AT)
q. Rail impact testing. To determine conformance to 3.5.6.6, verify that the
MIL-STD-810 rail impact test has been used to validate the structural integrity of the
item and approved.
r. Fixed wing air transport. To determine conformance to 3.5.6.7, verify that the trailer
was approved for air transportable by C-130 aircraft and be capable of being
externally slung from a CH-47 helicopter and delivered in a single lift while fully
assembled.
4.6.3.1 Performance. To determine conformance to 3.5.7, the trailer shall pass the
tests of 4.6.3.1.1 through 4.6.3.1.9. Prior to performance tests, the trailer shall be equipped,
serviced, loaded, and coupled to the prime mover as specified herein.
4.6.3.1.1 Highway and cross-country operation. To determine conformance to
3.5.7.1.1 and 3.5.7.1.2, the trailer shall be connected to the prime mover, loaded as specified and
towed during road testing over terrain at speeds specified in table II. During and after road
testing, trailers shall be examined as specified and as applicable in 4.6.3 and table IV. Trailers
with reach tubes shall be operated in the fully extended position for a distance of 25 miles
(40 km) as part of a 50 mile (80 km) road test (see 4.4.2.1). For trailers with bolsters, the
payload shall be distributed on three bolsters in extended and retracted positions and maintain
required weight on the lunette.
4.6.3.1.2 Grade and slope operation. To determine conformance to 3.5.7.1.3, the
trailer shall be towed by its prime mover ascending and descending a 40% grade. The trailer
shall be towed across a 20% side slope. Trailer slip or upset shall be considered failure.
4.6.3.1.3 Service brakes. To determine conformance to 3.5.7.2.1, the brakes of the
towing vehicle and trailer shall be applied simultaneously while the combination is traveling
forward at 20 mph. Stopping distance in excess of 35 ft (10.7 m) shall constitute failure of this
test. The results of the test shall also comply with FMCSR CFR 49, chapter 393.52.
4.6.3.1.4 Automatic brake actuator. To determine conformance to 3.5.7.2.2, the fully
loaded trailer, coupled to its prime mover shall be parked on a 15% grade. With the prime
mover brakes applied, air lines to the trailer shall be disconnected allowing the actuator to
engage the trailer pulling the breakaway chain. The prime mover shall be moved to provide
clearance between the pintle and lunette so that trailer movement is possible. With the prime
mover brakes reset, the trailer shall remain stationary for 15 minutes; any movement within the
15 minutes shall constitute test failure. The test shall be performed with the trailer headed
upgrade and downgrade.
4.6.3.1.5 Parking brake. To determine conformance to 3.5.7.2.3, the prime mover
with coupled trailer shall be placed on a 20% grade, ascending or descending, and the parking
brake actuated. The prime mover shall be moved to provide clearance between the pintle and
lunette so that trailer movement is possible. The trailer shall remain stationary. Any rolling
movement shall constitute failure of this test.
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