What is the requirement for the use of safety belts and shoulder harnesses during takeoff and landings?

The correct choice highlights the requirement that the pilot must use safety belts, and shoulder harnesses are mandated specifically during takeoff and landings. This is consistent with safety regulations that are designed to enhance protection during the phases of flight where the risk of injury is higher, such as during departures and arrivals.

Using safety belts ensures that the pilot is securely restrained in the event of turbulence or a hard landing, while the requirement for shoulder harnesses adds an additional layer of protection by keeping the upper body more secure. The regulation reflects an understanding that these critical phases of flight require heightened awareness and preparedness for any unexpected events.

This requirement underscores the importance of proper safety equipment use as part of best practices in aviation, providing a standardized approach to ensuring the safety of pilots and, by extension, passengers. In contrast, options that suggest shoulder harnesses are optional or only necessary during specific conditions do not align with these rigorous safety standards aimed at minimizing the risk of injury.