• The FAA's Part 117 rule replaced old flight-time arithmetic with duty period caps.
• The rule requires at least 10 consecutive hours of pre-duty rest.
• It also limits cumulative flight time to 100 hours in 672 consecutive hours.
• The rule aims to reduce pilot fatigue and improve safety.

The implementation of Part 117 may indicate a shift in the FAA's approach to pilot fatigue, suggesting a more comprehensive understanding of the factors contributing to it. This change could have significant implications for the aviation industry, potentially leading to improved safety and reduced accidents, which may in turn impact airline operations and passenger confidence.