How does the Final Approach Runway Occupancy Signal (FAROS) alert arriving pilots that the runway is occupied?

A. By changing the color of the runway lights
B. By sounding an audible alarm in the cockpit
C. By transmitting a warning message to the aircraft's communication system
D. By activating runway exit lights

The Final Approach Runway Occupancy Signal (FAROS) alerts arriving pilots that the runway is occupied by changing the color of the runway lights, specifically triggering them to flash white to red. This system helps alert pilots to potential runway incursions during landing.

Explanation:

The Final Approach Runway Occupancy Signal (FAROS) is designed to alert pilots to potential conflicts on the runway ahead. It does this primarily through visual cues. If a runway is occupied or if there is another type of hazard potentially posing a risk, the FAROS triggers a change in the color of the runway lights to alert the approaching pilot. Specifically, they cause the runway approach lights to flash white to red. This functions as a warning to pilots about potential runway incursions. This alerting system complements audible cockpit alerts and communication-based alerts that pilots must also pay attention to during landing.

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