To calculate descent distance, what factor is multiplied by the altitude you need to descend?

To calculate descent distance, the commonly used factor is indeed approximately 3 miles for every 1,000 feet of altitude you need to descend. This rule of thumb helps pilots determine how far out they should begin their descent based on their current altitude, allowing them to manage their descent rate and ensure a smooth approach to the runway.

For example, if a pilot needs to descend from an altitude of 10,000 feet, multiplying that by the factor of 3 miles results in an approximate descent distance of 30 miles before the airport. This calculation is crucial for maintaining proper flight safety and ensuring adherence to air traffic control instructions.

Understanding this principle aids in flight planning and execution, as it allows pilots to set up their descent in a structured manner, optimizing both fuel efficiency and passenger comfort.