What is the localizer coverage range for the first 10 nautical miles?

The localizer coverage range for the first 10 nautical miles is typically 35 degrees. Localizers are part of the Instrument Landing System (ILS) and provide lateral guidance to aircraft during the approach phase of landing. The localizer signal helps pilots align the aircraft with the runway centerline.

Within the first 10 nautical miles from the runway threshold, the localizer transmitter is designed to provide a reliable, strong signal covering an angular width of approximately 35 degrees. This range allows for sufficient lateral guidance for pilots, enabling them to navigate safely and accurately as they approach the runway.

The angles increase as the aircraft gets closer to the runway threshold, ensuring that pilots have adequate guidance to maintain the correct approach path during the landing phase. This 35-degree standard is critical because it balances coverage and precision, enabling pilots who may be at various points in their approach to receive the necessary guidance while maintaining the integrity of the signal.