Explain the "3-2-1" rule in relation to landing.

The "3-2-1" rule is a guideline that is critical for pilots during the landing phase of flight. It instructs pilots to be at least 3 miles from the runway when at an altitude of 2,000 feet and to reach 1 mile from the runway at 1,000 feet of altitude. This structured approach helps ensure that the aircraft is at the appropriate altitude and distance for a safe landing.

Following this guideline allows pilots to manage their descent rate effectively and prepare for landing in a timely manner. It serves as a visual reference for situational awareness and enhances safety by ensuring that pilots have adequate time to assess the runway environment and make any necessary adjustments to their approach. This method is widely adopted in aviation training and practice, emphasizing the importance of distance and altitude in preparing for a successful landing.

Understanding this rule aids pilots in developing a good habit during the approach phase, thereby increasing overall safety during landing operations.