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MIL-T-81311A(AS)
4.4.7.3.2 The loaded trailer shall be towed to a position where
the front of the trailer is facing down a 20 percent (11.3 degrees)
grade and the parking brakes applied. The towing forces shall be re-
moved and the trailer shall hold its position for a minimum time of 30
minutes.
4.4,8 Examination. - Upon completion of the foregoing tests, the
trailer shall be examined. The trailer shall not have suffered any
damage which is considered sufficient to preclude its meeting any per-
formance or operational requirements of this specification.
Unless otherwise specified in the
4.5
Environmental testing.
contract or order, sample trailers supplied as specified in 4.2.1 shall
be subjected to the following environmental testing.
4.5.1 High temperature. - The trailer shall be loaded with 8,000
pounds as described in 4.4.1 and exposed to an ambient temperature of
160 degrees Fahrenheit for eight hours. At the end of the eight hour
exposure and while still at 160 degrees, the trailer shall be rolled to
assure function of moving parts and brakes. The temperature of the room
degrees Fahrenheit and the trailer examined.
shall be returned to 80
4.5.2 Low temperature. - The loaded trailer shall be exposed to an
ambient temperature of minus 65 degrees Fahrenheit for eight hours. At
the end of the eight hours exposure and while still minus 65 degrees,
the trailer shall be rolled to assure function of moving parts and
brakes. The temperature of the room shall be returned to 80
degrees
.
Fahrenheit and the trailer examined.
4,5.3 Humidity. The trailer shall be unloaded and subjected to
the Humidity Test of Method 507.1, Procedure I, M1L-STD-81O. At the
conclusion of the ten cycles, the trailer shall be returned to a normal
humidity environment and examined. The trailer shall be towed a short
distance to assure function of moving parts and brakes.
4.5.4 Sand and dust. - The loaded trailer shall be subjected to
the Sand and Dust Test of Method 510.1, Procedure I, MIL-STD-81O. The
air velocity shall be between 100 and 500 feet per minute. At the
conclusion of the test, the trailer shall be returned to a normal en-
vironment and examined. The trailer shall be towed a short distance to
assure function of moving parts and brakes.
4.5.5 Fording. - The trailer, loaded as described in 4.4.1 shall
be towed into a 30 inch deep fording tank. After 30 minutes immersion,
the trailer shall be removed from the tank and attached to a prime
mover, The trailer shall then be towed at 15 miles per hour and the
brakes applied. The braking characteristics shall be noted.
PACKAGING
5.
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