When are parachutes required onboard an aircraft?

Parachutes are required onboard an aircraft when the bank angle exceeds 60 degrees or when the nose attitude exceeds 30 degrees in an aerobatic maneuver. This regulation is focused on ensuring the safety of pilots and crews during aerobatic flight, acknowledging that at these angles, the risk of losing control of the aircraft increases significantly. Having a parachute provides a critical safety measure that allows pilots to exit the aircraft should they find themselves in a perilous situation that exceeds the aircraft's operating limits.

In the context of aerobatic flight, operations are typically conducted in a manner where extreme angles of bank and pitch are commonplace, and the potential for mishaps is elevated. Therefore, the requirement for parachutes in these scenarios is a proactive measure to enhance safety.

The other options do not align with current regulations; for instance, while extreme bank angles can pose risks, the specific criteria for requiring parachutes pertain to aerobatic maneuvers rather than general flight operations. Understanding this distinction is crucial for ensuring compliance with safety regulations and enhancing the efficacy of safety measures during aerobatic operations.