Pressure Altitude - What it is and Why it is Used

In this video I describe what is Pressure Altitude and why it is needed. Pressure Altitude is True Altitude corrected for non-standard pressure. We need to know Pressure Altitude so that we can utilize the takeoff and landing, and cruise performance charts in the aircraft's Pilot Operating Handbook. In this video I show how to calculate Pressure Altitude. I also discuss why it is important to update the Altimeter's Kollsman Window with the latest local Barometric pressure value to ensure the aircraft continues to fly at the same pressure altitude. As the saying goes, high to low, watch out below!