SAE Standards Works
A-4 Aircraft Instruments Committee
AS8009C - Pressure Altimeter Systems
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Patrick J. Moynihan
Pressure Altimeter Systems
This SAE Aerospace Standard (AS) specifies minimum performance requirements for primary 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. 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 analog type instruments. Digital instruments or automatic test instrumentation may require other test procedures. Such differing procedures shall be justified prior to use.
AS8009B, "Pressure Altimeter Systems" was last revised in September 2005. It is being updated to address potential impacts driven by RVSM requirements and additionally, requirements will be included from Aeronautical Standard AS392C, entitled, "Altimeter Pressure Actuated Sensitive Type". This latter document was determined to be non-current May 1993 and reaffirmed non-current in February of 2008. When the AS8009B revision is completed and released, it is the intent of the A4 Working Group to take the appropriate steps to designate AS392C as "Cancelled."
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