For a typical 3-degree descent angle, how is the VDP calculated?

For a typical 3-degree descent angle, how is the VDP calculated?

• A. Altitude divided by 100
• B. Height above TDZE divided by 300
• C. Height above sea level divided by 600
• D. Distance to the runway divided by 3

Answer: (B)

The correct method to calculate the Visual Descent Point (VDP) for a typical 3-degree descent angle is by using the height above the touchdown zone elevation (TDZE) divided by 300. This approach is based on the geometric relationship of the descent angle to the distance covered during the descent. In a 3-degree descent, for every nautical mile covered horizontally, the aircraft descends approximately 300 feet vertically. Therefore, if you know your altitude above the TDZE, you can determine how far you should be from the runway to achieve a proper descent angle by dividing that altitude by 300. This calculation is particularly useful for ensuring a stabilized descent path that aligns with standard operational practices for instrument approaches, allowing pilots to reach the runway safely while maintaining the correct angle of descent.

The correct method to calculate the Visual Descent Point (VDP) for a typical 3-degree descent angle is by using the height above the touchdown zone elevation (TDZE) divided by 300. This approach is based on the geometric relationship of the descent angle to the distance covered during the descent.

In a 3-degree descent, for every nautical mile covered horizontally, the aircraft descends approximately 300 feet vertically. Therefore, if you know your altitude above the TDZE, you can determine how far you should be from the runway to achieve a proper descent angle by dividing that altitude by 300.

This calculation is particularly useful for ensuring a stabilized descent path that aligns with standard operational practices for instrument approaches, allowing pilots to reach the runway safely while maintaining the correct angle of descent.