MIL-DTL-62186C
its oil supply shall be temperature stabilized at -25 5F (-32 2.8C). Conduct a low
temperature operation test at -25F (-32C) and in accordance with procedure I, method 502.3 of
MIL-STD-810, or equivalent (see 4.3.1). While stabilized at -25F (-32C), and with 45 psig
(310 kPa) oil pump inlet pressure, the unit shall be subjected to and pass the tests as specified in
4.3.5.1, 4.3.5.4, 4.3.5.7, and 4.3.5.8 without evidence of damage. The alternator oil pump outlet
pressure shall not exceed the proof pressure.
4.3.8.2.2 High viscosity oil test. Install the alternator on an engine-transmission
assembly and operate at no electrical load with 10 grade oil conforming to MIL-PRF-2104. The
test system shall be cold soaked at -10F (-23C) for 24 hours. The engine shall be started while
at -10F (-23C) and shall remain at idle rpm until engine oil pressure stabilizes. The engine
shall then be immediately accelerated to maximum. There shall be no indication of failure,
fractures, distortions, erosion, internal oil leakage, or other evidence of deterioration, and
external oil leakage shall be not greater than 0.03 in3 (0.49 cm3) per hour.
4.3.8.3 Shock test. Mount the alternator on a shock test machine, utilizing the alternator
mounting brackets and simulating the actual installation as much as practical. Subject the
alternator to sawtooth shock pulses of 20 g for a duration of 11, +2 ms in accordance with
MIL-STD-810, method 516.4, procedure I, or equivalent (see 4.3.1). There shall be no evidence
of damage.
4.3.8.4 Vibration test. Mount the alternator as in intended use. Vibrate the alternator
along each axis according to figures 6 through 8. The vibration axis shall be oriented in
accordance with figure 12. Cycling time in each axis shall be 100 minutes. Each sweep shall be
5 to 500 Hz in 15 minutes. Resonant frequencies of the alternator shall be observed and a
sinusoidal resonance search shall be conducted for the four most severe resonant frequencies of
the alternator. The test sample shall then be subjected to dwell time at the most severe resonance
in accordance with the applicable figure. The frequency of applied vibration shall be swept over
the specified range in accordance with figure 13. The sweep time of figure 13 is that of an
ascending plus a descending time. There shall be no internal oil leakage, external oil leakage in
excess of 0.03 in3 (0.49 cm3) per hour, or any other evidence of damage.
4.3.8.5 Waterproofness test. Seal all installation openings and pressurize the alternator
inside a storage container containing approximately 1 cubic foot (ft3) (0.028 cubic meters (m3))
to 10 psig (69 kPa) of nitrogen. With the nitrogen supply shut off, the leakage rate shall not
exceed 3 psig (21 kPa) in 2 minutes.
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