MIL-DTL-6162C
4.6.19.2 Radiated interference. Radiated interference shall be within the RE05 limits for Class III B
equipment. Measurements shall be made in accordance with the specified techniques of MIL-STD-461.
4.6.20 Operating position. The machine shall be placed in a suitable test stand such that the rotating axis of the
machine is vertical, and the tests of paragraphs 4.6.6 and 4.6.7 shall be performed. After completion of these tests,
the machine shall be run at the continuous operating speed, rated voltage, and rated load until the total of 10 hours of
vertical operation in each of the two orientations (drive end up and drive end down) has been completed. Bearing
temperatures shall not exceed design limits. Failure, excessive wear, or indication of flaws of any part shall be cause
for rejection.
4.6.21 Environmental. The machine shall be subjected to the following environmental tests in accordance with
the specified method of MIL-STD-810 except where noted. Upon completion of each of the environmental tests the
machine shall be operated as a starter, if applicable, and a generator. As a starter, it shall be subjected to four
consecutive start cycles. The machine shall then be subjected to the tests of paragraph 4.6.6. Failure to meet the
requirements of either test shall be cause for rejection.
4.6.21.1 Low temperature storage - Method 502, Procedure I. The machine shall be exposed and maintained at
a temperature of -65° C (-85° F) for a period of 72 hours after which it shall be removed and allowed to normalize.
The machine shall be visually inspected upon removal from the cold chamber and after normalization.
4.6.21.2 Low temperature - Method 502, Procedure I. The machine shall be exposed and maintained at a
temperature of -54° C (-65° F) for a period of 24 hours. The machine shall be subjected to the tests specified with
normal cooling at the minimum specified sea level temperature.
4.6.21.3 High temperature - Method 501, Procedure I. The machines shall be maintained at a temperature of
248° F (120° C) for a minimum period of 72 hours. Class A and B machines shall be permitted to cool to 70° C
(158° F) and 80° C (176° F), respectively, before the test(s). The machines shall be subjected to the tests specified
with normal cooling at the maximum specified sea level temperature.
4.6.21.4 Vibration. The machine shall be mounted on the test apparatus in such a manner that sufficient
rigidity is obtained so that the fundamental bending resonance of the machine does not induce appreciable flexure in
the mounting. The machine shall be rotated at its continuous operating speed. Normal cooling shall be provided.
Equipment operation may be as a motor or as a generator. Vibration shall be in accordance with MIL-STD-810,
Method 514, Category (a), Procedure (I), Curve (Z). The fundamental bending resonant frequency shall not be less
than that specified on the associated specification sheet. Any mechanical damage due to vibration test shall be cause
for rejection.
4.6.21.5 Explosion proof. When specified on the associated specification sheet, the explosion proof test shall
be conducted in accordance with Method 511, Procedure I of MIL-STD-810. Any ignition of ambient explosive
gaseous mixture shall be cause for rejection.
4.6.21.6 Humidity. The humidity test shall be in accordance with Method 507, Procedure I of MIL-STD-810.
4.6.21.7 Fungus. The machine shall be subjected to the fungus test in accordance with Method 508 of
MIL-STD-810.
4.6.21.8 Salt fog. The machine shall be subjected to the salt fog test Method 509, Procedure I of
MIL-STD-810. The synthetic salt spray solution to be atomized and injected into the test chamber shall be
formulated as follows:
Chemical
Grams Per Liter
Sodium Chloride
24.540
Magnesium Chloride
11.110
Sodium Sulfate
4.094
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