Which two common approach lighting systems provide lead-in lighting to assist approaches in low visibility?

• A. PAPI and VASI
• B. Ceilometer and Anemometer
• C. ALSF-2 and MALSR
• D. NOTAM and METAR

Answer: (C)

Approach lighting systems provide a visual lead-in to the runway to help pilots transition from instrument to visual flight in low visibility. The two common systems that offer this lead-in lighting are ALSF-2 and MALSR. ALSF-2, or Approach Lighting System with Sequenced Flashing Lights, extends the lighting sequence outward from the runway to guide the aircraft along the final approach path, with flashing lights that help establish depth and alignment in poor visibility. MALSR, the Medium-Intensity Approach Lighting System with Runway Alignment Indicator Lights, provides a mid-range lighting setup with additional indicators to assist aligning with the runway.

PAPI and VASI are visual slope indicators that help you see if you’re on the correct glide path, but they’re not the lead-in lighting along the approach. Ceilometer and anemometer are weather instruments, not lighting systems. NOTAM and METAR are sources of weather and NOTAM information, not lighting.