If an aircraft lacks an electronically or anticollision light system, when is it prohibited from being operated?

The correct answer is that an aircraft lacking an electronically or anticollision light system is prohibited from being operated after sunset to sunrise. This regulation is in place to ensure the safety of all aircraft operating in the airspace. Collision avoidance is crucial, especially during night operations when visibility is significantly reduced. The absence of these lights increases the risk of mid-air collisions since other pilots may not be able to see the aircraft in time to take evasive action.

Operating during daylight hours is generally less hazardous because natural light improves visibility, allowing pilots to more easily see other aircraft and obstacles. Inclement weather conditions can affect visibility but do not specifically relate to the requirement of collision lights; rather, they are applicable in any operational limitations based on weather criteria regardless of light systems. Operating above 10,000 feet does not inherently necessitate a different set of rules for aircraft without collision lights since the risks associated with visibility and possible collisions are relevant at all altitudes. Thus, the nighttime operational limitation is specifically focused on ensuring maximal safety during the hours of darkness.