MIL-DTL-62186C
h. Contract number.
i. Date of manufacture.
3.7 Operating environment requirements. Each regulator shall operate under the
environmental conditions as specified in 3.7.1 through 3.7.8.
3.7.1 High temperature. The alternator shall operate in an ambient temperature of
225 5F (107 2.8C) without damage or loss of performance.
3.7.2 Low temperature. The alternator shall meet the low temperature requirements as
specified in 3.7.2.1 and 3.7.2.2.
3.7.2.1 Cold soak. The alternator shall operate in an ambient temperature of -25 5F
(-31.7 2.8C) without damage or loss of performance, and without the alternator oil pump
outlet pressure exceeding the proof pressure.
3.7.2.2 High viscosity oil. The alternator shall withstand operation at an ambient
temperature of -10 2F (-23.3 1C) for at least 24 hours, using grade 10 oil conforming to
MIL-PRF-2104, and without indication of failure, fractures, distortions, erosion, internal and
external oil leakage, or other evidence of deterioration.
3.7.3 Shock. The alternator shall withstand a saw-tooth wave shock pulse of
20 gravity units (g) for 11 milliseconds (ms) without sustaining damage.
3.7.4 Vibration. The alternator shall withstand exposure to input vibration levels
outlined in figures 6 through 8 for a period of at least 100 minutes in each of the mutually
perpendicular axes without damage or loss of performance.
3.7.5 Waterproofness. The alternator shall maintain a differential pressure of nitrogen at
10 pounds per square inch gage (psig) (69 kPa). The leakage rate shall be not greater than 3 psig
(20.7 kPa) in 2 minutes.
3.7.6 Humidity. The alternator shall withstand exposure to 5 continuous 48 hour
humidity cycles in accordance with figure 9 without damage or loss of performance.
3.7.7 Aqueous salt environment. The alternator shall operate in an aqueous salt
atmosphere (5 1% salt and 95% water) without corroding, sustaining electrical damage, or
physically deforming.
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