This Aeronautical Standard covers two (2) basic types of instruments as follows:
Type I - Range 35,000 feet. Barometric Pressure. Scale range at least 28.1 - 30.99 inches of mercury (946-1049 millibars). May include markers working in conjunction with the Barometric Pressure Scale to indicate pressure altitude.
Type II - Range 50,000 feet. Barometric Pressure. Scale range at least 28.1 - 30.99 inches of mercury (946-1049 millibars). May include markers working in conjunction with the Barometric Pressure Scale to indicate pressure altitude.
Rationale: AS392 has been superceded by AS8009, which is intended for use for new equipment design.
This document is being stabilized by the committee due to its historical usage as the technical performance requirements for TSO-C10. The TSO has been revised to use AS8009, and as such, AS392 will not be updated; however, it retains relevance for equipment authorized and maintained under the previous revision.
