MIL-DTL-81963C
4.10.3.2 Altitude, high temperature. The unenergized servocomponent shall be placed in a test
chamber, the internal ambient temperature of which shall be raised to and controlled within ± 2 degrees C
of the high ambient temperature specified in the applicable general specification and the servocomponent
shall be allowed to attain the stabilized non-operating temperature condition of 4.2.2.1. The
servocomponent shall then be energized so as to attain the stabilized operating temperature condition of
4.2.2.2. The pressure in the test chamber shall then be reduced to 8.27 Torr (1,102.39 Pascals or
approximately equivalent to an altitude of 100,000 feet). While still in this specified environment, the
servocomponent shall be subjected to and shall meet the requirements as specified in 3.7.3.2.
4.10.4 Endurance. Unless otherwise specified in the applicable general specification, the
servocomponent shall be energized and either electrically or mechanically loaded or both and either
driven or non-driven as specified in the applicable general specification and shall operate or be operated
under the applicable condition shown in table II. Upon completion of the endurance test, the
servocomponent shall be subjected to and shall meet the requirements specified in 3.7.4.
4.10.5 Ambient temperature.
4.10.5.1 Ambient low temperature. The unenergized servocomponent shall be placed in a test
chamber and mounted on a test fixture. The chamber temperature shall be lowered to and maintained at
- 62 ± 2 degrees C. The servocomponent shall be allowed to attain the stabilized non-operating
temperature condition of 4.2.2.1, while in this environment. The test chamber temperature shall then be
raised to and controlled at - 55 ± 2 degrees C for a period of one hour. At the end of this period and while
in this environment, unless specified otherwise in the applicable specification, the unit shall be energized
in accordance with 4.2.3 and allowed to attain the stabilized operating temperature condition of 4.2.2.2.
The servocomponent shall then meet the requirements specified in 3.7.5.1.
4.10.5.2 Ambient high temperature. The unenergized servocomponent shall be placed in a test
chamber and mounted on a test fixture. The chamber temperature shall be raised to and maintained
within ± 2 degrees C of the high ambient temperature specified in the applicable general specification.
The servocomponent shall then be allowed to attain the stabilized non-operating temperature condition of
4.2.2.1. Unless specified otherwise in the applicable general specification, the servocomponent shall be
energized in accordance with 4.2.3 and allowed to attain the stabilized operating temperature condition of
4.10.6 Moisture resistance. The servocomponent shall be tested in accordance with MIL-STD-202,
method 106 and the requirements of 3.7.6. The servocomponent shall be placed in the test chamber with
its rotor shaft in a horizontal position. During the test, half of the qualification sample (one
servocomponent) shall be energized in accordance with 4.2.3 and the other half shall be unenergized.
Unless specified otherwise in the applicable general specification, after completion of the final cycle, the
entire sample (two servocomponents) shall be maintained energized at standard test conditions (see
4.2.1) for 24 ± 4 hours. Immediately after the final energization period, the servocomponent shall be
subjected to and meet the requirements as specified in 3.7.6.
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