What is the purpose of the Approach Lighting System (ALS) in ILS?

What is the purpose of the Approach Lighting System (ALS) in ILS?

• A. It helps with visual navigation only
• B. It assists in transitioning from radio-guided flight to visual approach
• C. It is responsible for maintaining altitude
• D. It measures ground speed only

Answer: (B)

The Approach Lighting System (ALS) plays a crucial role in assisting pilots during the transition from an instrument approach to landing. Specifically, it provides visual references for pilots as they descend and approach the runway environment. The system consists of a series of lights that extend from the runway threshold into the approach area, designed to illuminate the approach path and section of the runway. This visual guidance becomes increasingly important as the aircraft transitions from relying solely on instruments to visually identifying the runway. By providing such visual cues, the ALS enhances situational awareness and can significantly improve safety, particularly in low visibility conditions. It enables pilots to maintain orientation and make a safe landing, effectively bridging the gap between the instrument phase of the flight and the visual aspects of landing. Thus, its primary purpose is to assist pilots during this critical phase of approach, confirming that the selected runway is aligned correctly and that they are on the right glide path for a safe landing.

The Approach Lighting System (ALS) plays a crucial role in assisting pilots during the transition from an instrument approach to landing. Specifically, it provides visual references for pilots as they descend and approach the runway environment. The system consists of a series of lights that extend from the runway threshold into the approach area, designed to illuminate the approach path and section of the runway. This visual guidance becomes increasingly important as the aircraft transitions from relying solely on instruments to visually identifying the runway.

By providing such visual cues, the ALS enhances situational awareness and can significantly improve safety, particularly in low visibility conditions. It enables pilots to maintain orientation and make a safe landing, effectively bridging the gap between the instrument phase of the flight and the visual aspects of landing. Thus, its primary purpose is to assist pilots during this critical phase of approach, confirming that the selected runway is aligned correctly and that they are on the right glide path for a safe landing.