The Vertical Speed Indicator, abbreviated as the VSI, presents the pilot with information on how fast the aircraft climbs or descents. This is achieved by measuring how fast the ambient pressure changes and translating this as a rate of change in feet per minute. In the below figure VSI indications are given in detail. The vertical speed is displayed in analogical and digital formats on the PFD. Besides presenting the current vertical speed, the Vertical Speed Indicator (VSI) also displays target vertical speed and respective bug, set through the Flight Guidance Controller. The PFD VSI also indicates vertical direction and minimum vertical speed to be attended during evasive maneuvers, according to TCAS commands.
1. Selected Vertical Speed Direction Arrow,
2. Selected Vertical Speed Read Out,
3. Vertical Speed Scale,
4. Selected Vertical Speed Bug,
5. Vertical Speed Counter,
6. Vertical Speed Readout.
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