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This standard covers Airspeed Instruments which display airspeed of an aircraft, as follows:

This AS covers Vertical Velocity Instruments which display the rate of change of pressure altitude of an aircraft, as follows: Type A - Direct reading, self-contained, pressure actuated Type B - Electrically or electronically operated, self-contained, pressure actuated Type C - Electrically or electronically operated, input from a remote pressure sensor

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.

This SAE Aerospace Standard (AS) covers the following basic types: Type I - Pitot pressure, straight and L-shaped, electrically heated. Type II - Pitot and static pressures, straight and L-shaped, electrically heated.