The 2013 Clarification of Flight, Duty, and Rest Requirements (PDF) answers a variety of questions concerning the FAA's 2012 Part 117 Final Rule.
Other legal interpretations of flight, duty, and rest requirements are searchable in the Legal Interpretations & Chief Counsel's Opinions database. You can search by requestor's name, subject, or regulation section number (e.g., 117.3, 117.11, 117.17).
Last updated: Wednesday, March 16, 2022