ACS Private Pilot Airplane Practice Test 2026 - Free Private Pilot Practice Questions and Study Guide

The spacing interval for lights in the Runway Centerline Lighting System is 50 feet. This configuration is crucial for providing visual guidance to pilots during takeoff and landing, especially in low visibility conditions. The 50-foot interval helps maintain a consistent and easily recognizable alignment along the runway's centerline, allowing pilots to gauge their position accurately relative to the runway while on approach or during rollout after landing. This interval ensures effective illumination without overwhelming pilots with excessive lighting, creating a balance that promotes safety and ease of navigation.