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Electromagnetic interference and compatibility |
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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 CO2 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 CO2. Removal and weighting of each CO2 bottle after test shall show a
minimum of 9 lb of CO2 discharged during test.
CAUTION: 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 115F and a cooling air intake grille
restriction not exceeding 2 inch H2O measured between cylinders and with a cooling air exhaust
restriction not exceeding 4 inches H2O 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.
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