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MIL-DTL-81963 Servocomponents, Precision Instrument, Rotating, Common Requirements And Tests, General Specification ForThis specification covers common requirements and tests for analog, digital and analog/digital precision instrument rotating servocomponents \(synchros, electrical resolvers, electrical, linear resolvers, transolvers, shaft angle encoders, servomotors, tachometer-generators, servomotor-tachometer generators, stepping motors, and gear heads\). This specification will be used with the applicable general specification, which covers a particular class of servocomponents \(for example, synchros\), together with the documents and the specification sheet that cite MIL-DTL-81963 as a direct reference detailing the specific requirement for the individual servocomponent.

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MIL-DTL-81963C
TABLE II. Endurance test time schedule.
Specification number
Shaft
MIL-S-22432
position
MIL-S-22820
SAE-AS20708
MIL-T-22821
Temperature
Temperature
Time 1/
Time 1/
(Hours)
°C
(Hours)
°C
64 ± 2
-55 ± 5
64 ± 2
-55 ± 5
Horizontal
H 2/
H 2/
24 ± 2
24 ± 2
Vertically Upward
H 2/
H 2/
24 ± 2
24 ± 2
45° Upward
H 2/
H 2/
24 ± 2
24 ± 2
45° Downward
H 2/
H 2/
24 ± 2
24 ± 2
Vertically downward
15° to 30°
15° to 30°
740 ± 4
1840 ± 4
Horizontal
(see 4.2.1)
(see 4.2.1)
100 ± 3
3/ 100 ± 5°
Horizontal
1/ Fifty (50) percent of rotation to be CW and 50 percent of rotation to be CCW.
2/ H is the ambient temperature specified in the applicable general specification.
3/ For MIL-S-22432 and MIL-S-22820, the 100 hours at 100 degrees C portion of the test shall be
performed at maximum power output, as specified in MIL-S-22432 and MIL-S-22820.
TABLE III. Zero defect sampling plan.
Sample size
Sample size
Lot size
For group A
For group B
1
to
2
100 percent
100 percent
3
to
12
100 percent
3
13
to
50
13
5
51
to
90
13
7
91
to
150
13
11
151
to
280
20
13
281
to
500
29
16
501
to  1,200
34
19
1,201
to  3,200
42
23
3,201
to 10,000
50
29
26



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