MIL-T-62222 Tank, Combat, Full-Tracked: 105Mm Gun, M48A5This specification covers one type of full-tracked, armored combat vechiles, which mounts a 105MM gun as the primary weapon.

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MIL-T-62222(AT)

4.7 Fire extinguisher. To determine conformance to 3.6, the fire extinguisher shall be tested for operation. With the engine idling at 700 to 800 rpm the internal control shall be pulled with a maximum effort of 55 lb using a force gage. The first shot shall actuate one bottle. Upon actuation of the first shot release mechanism, the engine shall shut down. Actuation of the

release mechanism shall result in a time delay of more than 6 seconds but less than 11 seconds

before the system begins discharging C02 into the engine compartment and into the center of the "V". After returning the handle to its original position, a second actuation shall discharge the remaining two bottles of C02. Removal and weighting of each C02 bottle after test shall show a minimum of 9 lb of C02 discharged during test.

CAUTI0N: When conducting these tests, safety precautions shall be exercised (see 6.3).

4.8 Electromagnetic interference and compatibility.

4.8.1 Electromagnetic characteristics. To determine conformance to 3.7.1 through 3.7.1.3, the vehicle shall be subjected to electromagnetic interference tests in accordance with

MIL-STD-462. When testing the radio for susceptibility RS03, care must be taken to assure that

any apparent susceptibility is not being caused by unwanted harmonics generated in the test source. As an aid to intra-system compatibility, broadband conducted emissions on the

+ 28 V dc bus shall be compared to the limits of CE07. Test plans shall be approved by the

Government (see 6.2.1).

4.9 Environment.

4.9.1 High temperature. To determine conformance to 3.8 and 3.4.10 (cooling system), the completed vehicle properly serviced and equipped, shall be subjected to the high temperatures specified herein and observed for performance, heating conditions, and cooling system operation. With the vehicle operating in ambient air temperature of 115°F and a cooling air intake grille restriction not exceeding 2 inch H20 measured between cylinders and with a cooling air exhaust restriction not exceeding 4 inches H20 measured above the cooling fans, for all transmission

gear ranges above 0.3 maximum speed ratio point, the vehicle shall meet the performance

requirements. Storage tests in accordance with MIL-STD-810 shall be performed.

4.9.2 Low temperature. To determine conformance to 3.8, the vehicle properly serviced and equipped, shall be subjected to the low temperature operational tests at temperatures specified herein. Storage tests in accordance with MIL-STD-810 shall be performed.

4.10 Continuous noise level. To determine conformance to 3.9, the average of three noise level readings at each octave band shall be determined at each operator's head position under normal operating procedures. The sound level meter, microphone related equipment and techniques employed shall be in accordance with MIL-STD-1474.

4.10.1 Noise hazard caution sign. To determine conformance to 3.9.1, verify that the noise hazard signs are clearly visible to personnel in all crew stations.