SAE AS8009C

This SAE Aerospace Standard (AS) specifies minimum performance requirements for pressure altimeter systems other than air data computers. This document covers altimeter systems that measure and display altitude as a function of atmospheric pressure. The pressure transducer may be contained within the instrument display case or located remotely. Requirements for air data computers are specified in AS8002. Some requirements for nontransducing servoed altitude indicators are included in AS791. This document does not address RVSM requirements because general RVSM requirements cannot be independently detailed at the component level. The instrument system specified herein does not include aircraft pressure lines. Unless otherwise specified, whenever the term “instrument” is used, it is to be understood to be the complete system of pressure transducer components, any auxiliary equipment, and display components. The test procedures specified herein apply specifically to mechanical type instruments. Solid state instruments or automatic test instrumentation may require other test procedures. Such differing procedures shall be justified prior to use. This standard was revised to: clarify some design requirements; update the environmental test requirements to include those of RTCA DO-160G; clarify some performance test requirements and to more closely align the equivalent metric test values with metric instrument markings. Special requirements for RVSM applications were not included because general RVSM requirements cannot be independently detailed at the component level. The intent is for this standard to replace AS392. AS8009C has been reaffirmed to comply with the SAE Five-Year Review policy.