If you need to lose 6000 feet of altitude, how far out should you start your descent on a 3-degree glide slope?

If you need to lose 6000 feet of altitude, how far out should you start your descent on a 3-degree glide slope?

• A. 10 NM
• B. 15 NM
• C. 20 NM
• D. 25 NM

Answer: (C)

To determine the appropriate distance to begin your descent when transitioning to a lower altitude on a 3-degree glide slope, you can use a formula that correlates altitude loss with distance. The rule of thumb used by pilots is that for every 1,000 feet of altitude you wish to lose, you should plan to descend about 3 nautical miles. In this scenario, you need to lose 6,000 feet. Using the formula, you multiply the altitude loss (6) by the distance for 1,000 feet (3). This calculation results in a total distance of 18 nautical miles. Since the closest standard distance to this value in the options provided is 20 nautical miles, it allows for a more gradual and safer descent path. Therefore, beginning the descent approximately 20 nautical miles out aligns well with the 3-degree glide slope technique, giving the pilot sufficient time to slow down, maintain control, and stabilize the aircraft's descent rate before reaching the new altitude. This approach enhances safety during the landing phase by ensuring that the aircraft descends at a steady and appropriate rate without exceeding the desired glide slope.

To determine the appropriate distance to begin your descent when transitioning to a lower altitude on a 3-degree glide slope, you can use a formula that correlates altitude loss with distance. The rule of thumb used by pilots is that for every 1,000 feet of altitude you wish to lose, you should plan to descend about 3 nautical miles.

In this scenario, you need to lose 6,000 feet. Using the formula, you multiply the altitude loss (6) by the distance for 1,000 feet (3). This calculation results in a total distance of 18 nautical miles. Since the closest standard distance to this value in the options provided is 20 nautical miles, it allows for a more gradual and safer descent path.

Therefore, beginning the descent approximately 20 nautical miles out aligns well with the 3-degree glide slope technique, giving the pilot sufficient time to slow down, maintain control, and stabilize the aircraft's descent rate before reaching the new altitude. This approach enhances safety during the landing phase by ensuring that the aircraft descends at a steady and appropriate rate without exceeding the desired glide slope.