MIL-DTL-81963C
3.6.14.2 Screw-thread terminals. Each screw-thread type terminal shall withstand, once only, a
gradual torque of 4.5 pound-inches or a 5-pound pressing or pulling force, which shall be maintained for a
period of 5 to 10 seconds without evidence of movement or damage to the terminal or surrounding
materials. Test in accordance with 4.9.14.2.
3.6.14.3 Solder-pin terminals. Each solder-pin type terminal shall withstand, only once, a gradual 2-
pound pulling force, which shall be maintained for a period of 5 to 10 seconds without evidence of
movement or damage to the terminal or surrounding materials. Test in accordance with 4.9.14.3.
3.7 Environmental.
3.7.1 Vibration (see 4.10.1). Servocomponents of frame size 23 and smaller shall withstand harmonic
vibrations of 0.06 inch double amplitude (maximum total excursion) or 15 gravity units (g peak), whichever
is less, over the frequency range of 10 to 2,000 Hz in each of three mutually perpendicular planes, one of
which shall be that of the servocomponent's shaft axis for a period of four hours in each plane. The
vibration cycle of 10 Hz to 2,000 Hz, and return to 10 Hz, shall be traversed in 20 minutes.
Servocomponents larger than frame size 23 shall withstand harmonic vibrations at frequencies up to 500
Hz at an acceleration of 10g (peak). Unless otherwise specified in the applicable general specification,
while in this environment, the servocomponent shall be energized and its shaft mechanically loaded in
accordance with figure 1A or 1B and free to rotate. Subsequently, the servocomponent shall show no
evidence of loose or damaged parts and shall then meet the requirements as specified in the applicable
general specification.
3.7.2 Shock.
3.7.2.1 Shock, specified pulse (see 4.10.2.1). The servocomponent shall withstand 30 impacts at an
acceleration of 50g (peak) of 11 ± 1 millisecond time duration, half sine waveform. The servocomponent
shall be subjected to five blows in each direction along three mutually perpendicular axes, one of which
shall be that of the servocomponent's shaft axis for a total of 30 blows. Unless otherwise specified in the
applicable general specification, while in this environment, the servocomponent shall be energized and its
shaft mechanically loaded in accordance with figure 1 and free to rotate. Subsequently, the
servocomponent shall show no evidence of loose or damaged parts and shall then meet the requirements
of the applicable general specification.
3.7.2.2 Shock, high impact (see 4.10.2.2). The servocomponent shall withstand three shock blows
from a weight of 400 pounds falling vertically from heights of 1, 3 and 5 feet, respectively, and three end
(back) blows from a weight of 400 pounds swinging on a radius of 5 feet and falling from a vertical height
of 1, 3 and 5 feet, respectively. Unless otherwise specified in the applicable general specification while in
this environment, the servocomponent shall be energized, with the shaft mechanically loaded and free to
rotate. Subsequently, the servocomponent shall show no evidence of loose or damaged parts and shall
then meet the requirements of the applicable general specification.
3.7.3 Altitude. The servocomponent shall operate from sea level to 100,000 feet in combination with
any temperature from -55 degrees C to the high temperature specified in the applicable general
specification.
3.7.3.1 Altitude, low temperature (see 4.10.3.1). The servocomponent shall withstand a reduced
chamber pressure of 8.27 Torr (1,102.39 Pascals or approximately equivalent to an altitude of 100,000
feet) after stabilization at an ambient temperature of -55 ± 2 degrees C. While still in this specified
environment, the servocomponent shall meet the requirements of the applicable general specification.
3.7.3.2 Altitude, high temperature (see 4.10.3.2). The servocomponent shall withstand a reduced
chamber pressure of 8.27 Torr (1,102.39 Pascals or approximately equivalent to an altitude of 100,000
feet) after stabilization at a high ambient temperature environment as specified in the applicable general
specification. While still in this specified environment, the servocomponent shall meet the requirements
of the applicable general specification.
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