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For domestic operations there is now a hard duty limit of 14 hrs
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This is incorrect information. Some union contracts have this restriction, but the FAA has no set duty day limit. What they do however, is have a max flight time between rest period restriction and a minimum look back rest restriction.
The end result is no more than 8 hours of scheduled flight time between rest periods as well as a minimum of 8 hours lookback rest at all times. This limits you to no more than 16 hours of duty, but there is no 16 hour max duty limit.
This is all for scheduled domestic carriers. The rules for supplemental carriers are different.
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Essentially, there is a hard duty day limit. There is now a hard duty period limit of 16 hours...and cannot be exceeded. You could be a short call reserve pilot, not having flown at all, and have to comply with the 16 hour max duty day. If, before takeoff, your enroute time will cause you to exceed 16hrs continuous duty...you cannot takeoff. This means if you have an extended taxi prior to takeoff, you may actually have to return to the gate and get off the airplane.
This is a major change to previous FAA interpretations where, basically, you could be on duty forever.
This is due to the "Whitlow Letter" interpretation of the FAA that is now over a year old.