How can you identify the outer marker beacon on an ILS approach?

The outer marker beacon on an ILS (Instrument Landing System) approach can be identified by the low-pitched dashes transmitted at a rate of two per second. This audible signal is crucial for pilots as it indicates that the aircraft is approximately 4 to 7 miles from the runway threshold and serves as a position reference during the approach. The outer marker is typically associated with a blue beacon on the approach plate.

Understanding this audio identification method is essential for pilots, as it helps them confirm their location along the approach path, ensuring they are correctly aligned with the runway. Proper recognition of the outer marker allows pilots to maintain situational awareness and prepare for further descent and decisions during the ILS approach, contributing to the safety and precision necessary for landing.