NAVSEA Technical Specification S9073-AX-SPN-010/MVA
This is a more recent standard, dated 1978, and was issued by the Naval Sea Systems Command (NAVSEA). It is based on average vibration signatures, and states that the acceptance criterion after machine overhaul is no higher than one standard deviation ("one sigma") above average spectral levels. The acceptance criterion during normal operation is the average spectral level plus two sigma.
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