What is the basic rest requirement prior to duty start in scheduled service?

The basic rest requirement prior to the start of duty in scheduled service is 9 hours. This requirement is established to ensure that flight crews are adequately rested before operating an aircraft, promoting safety and reducing the potential for fatigue-related incidents.

Regulatory guidelines in Part 135 operations mandate that pilots must receive a minimum of 9 continuous hours of rest, allowing them sufficient time to recover from prior duty. This helps maintain alertness and the ability to perform complex tasks during flight operations. Understanding and adhering to this rest requirement is crucial for maintaining operational safety and compliance with aviation regulations.

Choosing a value such as 10, 8, or 11 hours would not align with the established minimums set forth in regulations, which could lead to excessive downtime or insufficient recovery periods, both of which are counterproductive in the context of flight safety and operational efficiency.