What are the flight crew duty hour limitations?

The correct answer aligns with the regulatory requirements established for flight crew duty hours, which are designed to ensure safety and reduce fatigue among pilots. The limitations typically set forth guidelines indicating that flight crew members may not exceed 900 flight hours in a calendar year and 100 flight hours within any 28-day period.

The rationale behind these specific numbers is to promote safety in aviation operations by minimizing the risk of fatigue-related errors. By imposing such regulations, aviation authorities aim to safeguard both the crew and passengers by ensuring that pilots have adequate rest and are fit for duty.

In analyzing the context of the other options, they all suggest higher or lower hour limits not in alignment with the regulations established by aviation safety standards, underscoring the importance of adhering to established guidelines for maximum hours of flying and duty to maintain operational safety.