What is the required communication distance when landing at an airport in Class E airspace?

The required communication distance when landing at an airport in Class E airspace is a crucial aspect of aviation rules and regulations related to airspace communication. In this case, the correct choice indicates that pilots must establish communication with air traffic control (ATC) when they are within 5 nautical miles (NM) of the airport and descending to an altitude of up to 2,500 feet above ground level (AGL).

This requirement ensures that pilots maintain safe operations as they approach an airport, allowing ATC to manage aircraft separation and coordinate smoother landings. This distance and altitude range provide a buffer for ATC to effectively monitor and guide aircraft as they enter the terminal airspace, which is often crowded with various aircraft operations.

The range of 5 NM and 2,500 feet AGL offers a balance between maintaining effective communication and not overwhelming ATC services with too early of a contact request. Pilots are trained to recognize these distances as part of their preparation for approach and landing phases, ensuring compliance with regulations designed for air safety.