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The Pitot-Static System: How It Works

Pilot Institute

If you’re in a modern, fancy airplane with glass primary flight displays instead of round dials, then it uses something called an Air Data Computer to show these readings. As the name implies, the VSI shows the rate of the aircrafts climb or descent. It shows the rate of climb or descent in feet per minute.

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RNAV Approaches Simplified: A Guide for New Pilots

Pilot Institute

LNAV Approach An LNAV (Lateral Navigation) approach helps guide you left and right toward the runway, but it doesnt tell you how to control your descent. Instead of a Decision Height (DH), youll use something called a Minimum Descent Altitude (MDA). Theyre only meant to keep the descent stable. Thats up to you! Easy, right?