Flight Duty Period Calculator
Read the exact current Table B or C cell, apply acclimation and show the latest scheduled FDP end after operator and fitness checks. Inputs stay in your browser.
The result reads the current Part 117 Table B cell and applies the required 30-minute reduction when the crewmember is not acclimated. Review note: Confirm the release inputs with the operator before using the table cell.
Context matters.
- Table B applies to unaugmented operations. Table C applies to acclimated augmented operations and depends on rest-facility class and 3 or 4 pilots.
- Section 117.17 also requires protected in-flight rest and limits augmented assignments to no more than three flight segments.
- This tool does not calculate reserve, split duty, cumulative limits, extensions, deadhead, rest or other assignment rules. The operator and crewmember remain responsible for the full Part 117 analysis.
Sources & scope
The calculation guide and this source trail show what the result means, where the rule came from and when it was last reviewed. This is source-and-calculation QA, not a claim of medical, legal, tax or other professional review; time-sensitive decisions still belong with the linked authority.
A visible path from input to answer.
Read the exact current Table B or C cell, apply acclimation and show the latest scheduled FDP end after operator and fitness checks. The page keeps the calculation scope and its limits beside the result so the output can be checked, copied or revisited.
- Read the record. The calculator uses FDP report date, Scheduled start in acclimated local time, Flightcrew configuration, Scheduled flight segments and Acclimation status and 5 additional fields supplied in the form.
- Apply the scope. It applies the United States Part 121 flightcrew planning — current 14 CFR Part 117 Tables B/C, acclimation, facilities, segments, operator release and fitness control reference and the explicit date, unit and counting conventions shown in the result.
- Expose the checkpoints. Intermediate rows, warnings and timeline events stay visible; the emphasized row identifies the primary checkpoint when one exists.
The result reads the current Part 117 Table B cell and applies the required 30-minute reduction when the crewmember is not acclimated. Review note: Confirm the release inputs with the operator before using the table cell.
- Operational authorityOperator release and current regulations control
Calculation purpose: Read the exact current Table B or C cell, apply acclimation and show the latest scheduled FDP end after operator and fitness checks. This is a high-sensitivity reference output; the linked authority or qualified professional controls the final decision.
Calendar inputs use plain year-month-day semantics. Leap days, month ends, date-pair order and unsupported dates are checked before the result is shown.
Rule set 1.1.0 · Last reviewed 2026-08-20 · Next review due 2027-02-20. The source panel below contains the linked evidence.
What to know before using the result.
Does this calculator use the actual Part 117 tables?
Yes. Unaugmented results come from current Table B; augmented results come from current Table C with pilots and rest-facility class.
What happens when a crewmember is not acclimated?
Sections 117.13 and 117.17 reduce the applicable table maximum by 30 minutes and use local time at the theater where the crewmember was last acclimated.
Can the table result clear every assignment?
No. Reserve, extensions, split duty, deadhead, cumulative limits, rest, actual conditions and fatigue reporting require the operator's full analysis.