In the maintenance-required lighting configuration, which lights must be ON?

• A. Landing light and/or taxi light: ON
• B. Anti-collision: ON
• C. Position: ON
• D. Searchlight: ON

Answer: (A)

In maintenance-required lighting configuration, the focus is on providing just enough illumination for ground operations and maintenance work without using unnecessary lighting. The landing light and/or taxi light must be ON so personnel can see the aircraft and move safely around it on the ground or during brief taxiing. This keeps visibility adequate for safety while avoiding extra electrical load from other lights.

Anti-collision lights are primarily for in-flight visibility to other aircraft, so they aren’t required in this ground-focused configuration. Position lights (nav lights) indicate the aircraft’s position and orientation in the air or at night, which isn’t the priority for maintenance on the ground. A searchlight is a specialized, rarely-used light, not part of the basic maintenance lighting requirement. If the aircraft has both landing and taxi lights, at least one of them should be ON.