MIL-DTL-62186C
4.3.8.6 Humidity test. Seal all installation openings and place the alternator in a
humidity testing chamber. Perform the following operations:
a. Operate the alternator under standard ambient conditions.
b. Dry the alternator at 129F (54C) for 24 hours.
c. Condition the alternator at 73F (23C) and at 50 10% relative humidity
for 24 hours.
NOTE: The alternator may be readjusted or realigned, as necessary, to meet
requirements. No further realignment or readjustment shall be permitted
throughout this period, other than with accessible controls employed for
operation of the alternator. No repair or replacement of parts shall be
permitted. Equipment shall be operated only when specified procedures are
being performed.
d. Raise the internal chamber temperature to 86F (30C) and the relative humidity
to
94 4%.
e. Subject the alternator to five continuous 48 hour cycles in accordance with
figure 9.
f. Upon completion of the test cycles , remove the alternator from the chamber to
ambient room conditions. With MIL-PRF-2104 grade 30 oil at 225 5F
(107 2.8C), perform 4.3.5.10 without delay. Return the alternator, with all
installation openings sealed, to the chamber. Raise the chamber to 73 5F
(23 2.8C) and 50 10% relative humidity, and condition for 24 hours.
g. Remove the alternator to ambient room conditions. With MIL-PRF-2104 grade
oil at 225 5F (107 2.8C) oil inlet temperature, perform 4.3.5.10 without
delay. There shall be no evidence of damage.
4.3.8.7 Aqueous salt environment test. Seal all installation openings and subject the
alternator to method 509.3 of MIL-STD-810, or equivalent (see 4.3.1), for 4 test cycles. There
shall be no evidence of corrosion.
4.3.8.8 Fungus resistance test. Seal all installation openings and install the alternator in a
fungus chamber. Subject the alternator to method 508.4 of MIL-STD-810, or equivalent
(see 4.3.1), for 28 days. Incubate samples under cyclic temperature and humidity conditions to
include 20 hours of relative humidity at 95 5%, at an air temperature of 86 5F (30 1C),
followed by 4 hours of 100% relative humidity at 77 2F (25 1C). There shall be no
evidence of fungal growth.
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