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|  MIL-K-70493(AR)
When specified in the contract, a special
3.2.3 Reliability.
sample shall be subjected to reliability testing. The
manufacturing and production techniques employed in the
fabrication of the keyboard shall not degrade the inherent
The inherent reliability shall not be less than
reliability.
(See 4 and 6)
162,056 hours Mean Time Between Failures (MTBF).
3.3 Environmental. The keyboard shall meet the requirements
specified herein unless otherwise specified.
3.3.1 Room ambient temperature. The requirements of this
specification shall be met with the keyboard thermally stabilized
0
0
0
at 0room ambient temperature of +16 C to +32 C (+60 F to
+90 F), unless otherwise specified in the requirements paragraph.
3.3.2 Environmental stress screen (ESS) temperature. The
keyboard shall meet the requirements of 3.2.1.1 and 3.2.1.3
inclusive after having been exposed to a minimum of ten
temperature cycles at temperatures of -57C and +71C (-71F
0
and +160 F).
The
3.3.3 Environmental stress screen (ESS) vibration.
keyboard shall meet the requirements of 3.2.1.1 and 3.2.1.3
inclusive, after having been subjected to a random or pseudorandom
vibration-which includes frequency content from 100 Hz to 1000 Hz
and up to a 3g RMS in two axis for a period of 10 minutes plus or
minus 15 seconds.
The keyboard shall be manufactured in
3.4 Fabrication.
accordance with drawing 9355810.
3.5 First article. When specified in the contract, a sample
shall be subjected to first article inspection (See 4 and 6).
3.6 Workmanship. The workmanship requirements of MIL-F-13926
and MIL-STD-454 shall be met. All components shall be fitted
properly and firmly in their respective positions. All electrical
connections shall be mechanically secure and electrically sound.
There shall be no evidence of corrosion, burrs, roughness, sharp
edges or other defects which could adversely affect its use or
suitability for the purpose intended.
3.7 Materials.
Materials shall be in accordance with
drawings, material specifications and general specifications
forming a part of this specification.
5
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