MIL-T-45379 Tank, Combat, Full-Tracked, 105 Mm Gun, M60A3-TtsThis specification establishes the construction, performance and inspection requirements for M60A3 full-tracked combat tank equipped with a Tank Thermal Sight TTS.

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MIL-T-45379D(AT)

4.6.4.3 Speeds.

4.6.4.3.1 Level-road speeds. To determine conformance to 3.5.3.1, the vehicle shall be operated at maximum speed for not less than 10 minutes and at minimum speed for not less than

5 minutes and checked for function of powerplant and powertrain. Drift shall be not more than

that specified in 3.5.3.3. During the maximum speed test cycle, the vehicle shall maintain a speed of not less than 30 mph for a distance of 100 yards 10 consecutive times.

4.6.4.3.2 Grade speeds. To determine conformance to 3.5.3.2, the vehicle shall be operated at a sustained speed of 10 mph while ascending a 10 percent grade and at a 20 mph speed while ascending a 3 percent grade.

4.6.4.3.3 Level road drift. To determine conformance to 3.5.3.3, the vehicle drift shall be checked at break-in (see 4.6.3) when traveling between 25 and 30 mph.

4.6.4.3.4 Acceleration. To determine conformance to 3.5.3.4, the vehicle shall be accelerated from a standing start through a distance of 200 ft and the time checked for performance as specified.

4.6.4.3.5 Climbing. To determine conformance to 3.5.3.5, the vehicle shall be driven in forward and reverse gear up an approved 60 percent grade and on 30 percent side slopes, engine stopped and restarted and observed for functional fuel system and climbing requirements. This test may be performed in conjunction with 4.6.4.4.

4.6.4.3.6 Engine starting on grades and slopes. To determine conformance to 3.5.3.6, the engine shall start and oil pressure and temperature shall be maintained when operating on specified grades and slopes with the fuel tanks filled to no more than 50 percent of capacity. This test may be performed in conjunction with 4.6.4.3.4 and 4.6.4.4.

4.6.4.4 Braking and drift.

4.6.4.4.1 Stopping. To determine conformance to 3.5.4.1, the vehicles shall be operated at

20 mph on dry, level, hard-surfaced roads without loose material, and stopped as specified. The

results of three consecutive stopping and drift distances shall be averaged to make this determination. To determine drift, the tank shall be stopped within the specified 60 ft braking distance without manual steering corrections. The distance from the line of travel established at the time braking is initiated shall not exceed 4 feet per 60 feet of measured braking distance.

4.6.4.4.2 Holding. To determine conformance to 3.5.4.2, a load of 6000 lb shall be placed on the vehicle in a position that will not restrict the flow of engine air (intake or exhaust). The vehicle shall be driven up a 60-percent dry; hard grade and the service brakes checked, and then the parking brakes checked for conformance. Checks shall be made with the vehicle headed up and down grade. This test may be performed in conjunction with 4.6.4.3.5 and 4.6.4.3.6.