Vertical Velocity Indicator Subassembly

The Vertical Velocity Indicator (VVI) Subassembly is a component of the Flight Instruments supply class, which falls under the Instruments And Laboratory Equipment supply group.

The VVI Subassembly is a device used in aircraft to provide information about the rate of climb or descent. It measures the vertical speed of the aircraft in feet per minute (fpm) and displays it to the pilot. This information is crucial for maintaining proper altitude control and situational awareness during flight.

The VVI Subassembly typically consists of a sensitive diaphragm or bellows that responds to changes in atmospheric pressure. As the aircraft climbs or descends, the pressure changes, causing the diaphragm to expand or contract. This movement is then converted into a visual indication on the instrument panel, allowing the pilot to monitor the rate of ascent or descent.

In addition to the visual display, some VVI Subassemblies may also include audible alerts or warnings to further assist the pilot in maintaining a safe and controlled flight profile.

Overall, the VVI Subassembly is an essential instrument in the Flight Instruments supply class, providing vital information about vertical speed to pilots for safe and efficient flight operations.