SCOPE:

Types:

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

Range:

The range of operation of the instrument and the altitude range when applicable shall be as marked on the instrument face or nameplate.

Purpose:

This SAE Aerospace Standard (AS) establishes the minimum performance standards for vertical velocity instruments for aircraft use.