MIL-DTL-62049G
ratio of 0.02 at 200 operational miles, equivalent to 1 operational hour. The scheduled
maintenance interval shall be 6 months or 6000 miles, whichever comes first (see 4.5.9).
3.6 Performance. The semitrailer shall meet the performance requirements when it is
fully equipped, serviced (see 6.6), and loaded with the applicable payload (see table V and
4.5.10).
3.6.1 Environmental operation. The semitrailer shall be capable of operation as specified
herein, in ambient operating temperatures ranging from -50 to +125 °F without deterioration that
causes failure of any component (see 4.5.10.1).
3.6.2 Payloads and speeds.
3.6.2.1 Highway operation. The semitrailer shall provide satisfactory operation over
relatively smooth, hard surfaced roads when loaded with the rated highway payload at the
specified speeds (see 4.5.8.1).
3.6.2.2 Cross-country operation. The semitrailer shall provide satisfactory operation
over unimproved roads and open, rolling, or hilly terrain when loaded with the rated
cross-country payload specified in table V and at the specified speeds (see 4.5.8.1).
3.6.3 Brakes.
3.6.3.1 Service brakes. With rated payload on the semitrailer the service brakes of the
combination semitrailer and towing vehicle shall control, decelerate, and stop the semitrailer
within 30 feet from a speed of 20 mph on a dry, hard, paved, level, smooth surface. Application
of the brakes on all wheels of the semitrailer and the towing vehicle is required within a 12-foot
wide lane (see 4.5.2 and 4.5.10.2.1).
3.6.3.2 Automatic actuation. The semitrailer shall be equipped with an automatic
actuating device to apply the semitrailer brakes upon breakaway from the towing vehicle. When
loaded with maximum payload specified herein, the automatic actuating device shall maintain
application of the brakes and hold the semitrailer stationary on a 20-percent grade for not less
than 15 minutes (see 4.5.2 and 4.5.10.3).
3.6.4 Fording. The semitrailer shall ford hard-bottomed, salt or fresh water crossings of
sufficient depth to cover the top rear portion of the main chassis frame without immersion of the
semitrailer body for up to 15 minutes duration, without damage to the semitrailer or its
components, and without special preparation or servicing before and after fording operations.
No evidence of water leakage or moisture penetration into the sealed wheeled bearings shall be
permitted (see 4.5.10.4).
3.6.5 Tracking ability. When towed over the specified roads and terrains, the semitrailer
shall be capable of transporting the rated payload of 6 tons, evenly distributed, without failure or
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