MIL-DTL-27190C
3.3.9 Electrical connector. The indicator shall be provided with an electrical connector,
MS3134H-7P or equivalent, to mate with MS3137E7-50S or equivalent.
3.3.10 Electrical wiring. The internal and external wiring of the indicator shall be in
accordance with figure 2.
3.3.11 Indicator synchro. The indicator synchro shall consist of a salient two-pole
wound rotor used as the primary and shall be designated for 26 volt (V), 400-cycle, single-phase
power, with Y-connected stators as the secondaries. The stators shall be wound so the
amplitudes of the induced voltages measured between any two stator leads will vary
approximately sinusoidally with the angular positions of the rotor. Pivots, bearings, and gears
shall not bind or shake and shall be as nearly frictionless as possible.
3.3.11.1 Synchro receiver. The synchro receiver used shall have electrical
characteristics compatible with those defined in SAE AS20708.
3.3.12 Secondary voltage. The maximum open-circuit voltage measured between any
two secondary leads shall be 11.8 V ± 3 percent.
3.3.13 Reliability. The indicator shall have a minimum mean-time-between-failures
(MTBF) of 2,000 hours based upon a discrimination ratio of 1.5 and a confidence factor of
90 percent when tested as specified in 4.5.24.
3.3.14 Longevity. The indicator shall have an operating life span of 3,000 hours.
3.4 Performance. The indicator shall operate satisfactorily after subjection to the
following conditions:
a. Temperatures ranging from -65 °C to 71 °C.
b. Vibration of 2 g from 5 cycles per seconds (cps) to 500 cps.
c. Pressure altitude of 100,000 feet at -55 °C.
d. Eight cycles of alternate immersion in tap water at 85 °C ± 2 °C and 5 °C ± 2 °C.
e. Exposure to salt sea atmosphere for 48 hours without evidence of corrosion or
deterioration.
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