Part 117 flight duty period limits, Table B lookup.

Who Part 117 applies to

14 CFR 117.1 prescribes flight and duty limitations and rest requirements for flightcrew members and certificate holders conducting passenger operations under part 121, and applies to operations directed by part 121 certificate holders under part 91 if any segment is a domestic, flag or supplemental passenger operation. It does not govern part 135 or general aviation flying.

Table B in full

For unaugmented operations (the minimum required flightcrew), 117.13 says a certificate holder may not assign, and a flightcrew member may not accept, a scheduled flight duty period that exceeds Table B. Hours are for lineholders, by start time in the theater where the crew member is acclimated.

Adjustments

• Not acclimated: 117.13(b) reduces the Table B maximum by 30 minutes, using local time at the theater where the crew member was last acclimated. The calculator applies this.
• Extensions: 117.19 lets the pilot in command and the certificate holder extend the duty period up to 2 hours for unforeseen circumstances before takeoff; an extension over 30 minutes may occur only once before the next rest period. Not applied here.
• Split duty: 117.15 excludes time in suitable accommodation if the rest opportunity is at least 3 hours, between 2200 and 0500, and the combined duty period plus rest stays within 14 hours. Not applied here.
• Rest: 117.25 requires at least 10 consecutive hours of rest before a flight duty period, with an opportunity for 8 uninterrupted hours of sleep, and 30 consecutive hours free of duty in any 168-hour period.

Worked example

A duty period starting at 0645 with two segments allows 13 hours. At 0500 with five segments an acclimated pilot has 11.5 hours; one who is not acclimated has 11. A start at 2330 with four segments gets 9 hours.

FAQ

Who must follow Part 117 flight duty limits?

Flightcrew members and certificate holders conducting passenger operations under part 121.

What is the longest flight duty period in Table B?

14 hours, for a duty period starting 0700 to 1159 with one or two flight segments.

Does the table change when I am not acclimated?

Yes. The maximum is reduced by 30 minutes under 117.13(b).

Can a flight duty period be extended?

For unforeseen operational circumstances before takeoff, by up to 2 hours under 117.19, subject to the conditions in that section.

How much rest is required before a duty period?

At least 10 consecutive hours immediately before the period, with an 8-hour sleep opportunity, under 117.25(e).

Where are the augmented crew limits?

Table C of Part 117, which this page does not reproduce.

Sources

Retrieved 2026-11-02. Statute and regulation text read through the eCFR API (current as of 2026-10-29) or the publisher URLs below.

• 14 CFR Part 117, Flight and Duty Limitations and Rest Requirements: Flightcrew Members: Sections 117.1, 117.13, 117.15, 117.19, 117.25 and Table B.