During engine shutdown, which lights should remain on until the propeller has come to a complete stop?

The indication that both anti-collision and navigation lights should remain on until the propeller has come to a complete stop is based on safety protocols during the engine shutdown phase. Keeping these lights illuminated is essential for signaling the aircraft's status to other personnel and aircraft in the vicinity.

Anti-collision lights are particularly important as they help to draw attention to the aircraft to prevent accidents on the ground or in the airspace. Navigation lights serve as a visual marker for the aircraft's position and orientation. By ensuring that both sets of lights are operational until the propeller stops spinning, it significantly enhances safety, allowing ground crews and other pilots to recognize the aircraft's operational state and avoid potential hazards.

In contrast, navigation lights and anti-collision lights being the only ones highlighted to remain on signifies their criticality in communication and safety, whereas landing lights serve a different purpose and are not required to stay on after the engine shutdown, as the focus shifts from operational status to securing the aircraft. Therefore, retaining the operational integrity of the anti-collision and navigation lights during this specific phase is aligned with established safety protocols.