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MIL-T-83808
(84)
movement. The vehicle shall show a capability of small increments, for forward
4.6.6.1.1 Incremental
and reverse movement, of not more than 1 foot.
Road test.  The vehicle shall be given a road test over level paved surfaces for 30 minutes
4.6.6.2
while pulling a trailer test load of 40,000 pounds minimum at 10 MPH minimum. The vehicle shall then be
road tested over level paved surfaces for 30 minutes without any trailing test load at 20 MPH minimum
Repeat above six times. Vehicle shall be at its curb weight, plus operator, during all tests. At the conclu-
sion of each test, a 10 minute rest period shall be permitted. During each test, 15 stops, 15 short radius
right turns and 15 short radius left turns shall be accomplished. At the conclusion of the tests, the vehicle
shall be examined , and any evidence of permanent deformation, maladjustment or undue wear shall be
cause for rejection. Evidence of skewing or overheating during the tests will be cause for rejection. Evi-
dence of tire scuffing or wear shall be cause for rejection. During the above tests, a thermal couple shall
be placed in the coolant fluid, and an LED readout shall be visible to the operator to show conformance to
3.3.2.1.2
4.6.6.3
Steering sytem test.The vehicle shall travel at 10 MPH and shall make a minimum of 15 right
hand turns. Each right hand turn shall be of the varying radius of curvature During each right hand turn.
the steering wheel shall be released, and the vehicle's steering system shall return to the neutral
(straight) position. The test then shall be repeated for left hand turns. Failure of this test shall be cause for
rejection. The performance test for emergency steer shall be in accordance with SAE J53.
Vehicle shall be tested in accordance with SAE J695b to show confor-
mance with 3.2.1. Particular attention will be given to tire wear due to tight turning radius.
4.6.6.4
Brake test. The vehicle shall be capable of stopping itself in 20 feet when traveling 20 MPH A
fifth wheel shall be used, and stopping distance accomplished shall not exceed requirement from any one
of six tries. Compliance with parking brake requirements shall be demonstrated. Additionally, the vehicle
shall be shown, by mathematical calculation, to conform with all other requirements in paragraph 3.34
When towing, the vehicle shall not add to yaw, sway, skid, tip, tilt, or jackknife under maximum braking
conditions and minimum stopping distances
4.6.6.4.1
Apply the service brakes, pedal force not to exceed 100 pounds, with
the engine operating at curb idle, move the transmission from neutral to forward drive, back through
neutral to reverse. There shall be no movement of the tractor in either direction due to wheel rotation
because of brake slippage The parking brake shall not be applied during this test. This test shall be
repeated 10 times in each direction.
4.6.6.4.2 Service brake test,  While traveling, the vehicle shall experience an engine failure simulation
and, while maintaining the boost (assist) to the service brake system for at least one brake application,
shall be capable of stopping within the limits specified herein. After the boost (assist) is no longer avail-
able to the service brake system, the operator shall be capable of stopping the vehicle with a maximum of
130 pounds pedal effort.
4.6.6.4.3
Tractor's parking brake together with the towed vehicle parking brake
shall hold a fully loaded towing and towed vehicle combination, both in forward and aft position, on an
11.5 incline for five minutes (each way). Service brakes shall not be applied
4.6.6.5
When a four wheel drive vehicle is required (see 6.2), the tractor must be
placed in the two wheel drive configuration and be driven 360 through the tightest turning radius obtain-
able. The number of rotations each wheel makes must be counted and recorded. This must be repeated in
the four wheel drive configuration. The number of revolutions each wheel makes in four wheel drive must
be within five percent of the number of revolutions that same wheel made in two wheel drive.
4.6.7
Design verification
25

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