Pilot duty and medical certificate timing · Calculator

Flight Duty Period Calculator
without the guesswork.

FAA Part 117 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. Uses a focused calculator with visible assumptions. Inputs stay in your browser.

Reference toolFAA Part 117 Flight Duty Period CalculatorRead 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.

Reference calculation

Inputs

Enter your details.

Your inputs are processed locally and are not uploaded to CalcSpan.

Section 1

Core details

Start with the information that defines this calculation.

FDP report date

Fri, Aug 21, 2026

Scheduled start in acclimated local time If not acclimated, use the local time at the theater where the crewmember was last acclimated.

Flightcrew configuration

Scheduled flight segments

Acclimation status

Section 2

Review and confirm

Check the remaining facts before calculating.

Assignment path

Fitness for duty

Operator release, acclimated time, segments and facilities confirmed

Plain-date semantics · start date is not counted unless the result explicitly says inclusive.

Your result

Confirm the release inputs with the operator before using the table cell

The result reads the current Part 117 Table B cell and applies the required 30-minute reduction when the crewmember is not acclimated.

Scheduled FDP startAug 21, 2026 at 06:00

ConfigurationUnaugmented operation · Table B

Scheduled segments3

Table maximum before acclimation12 hours

Acclimation adjustmentNone

Adjusted table maximum12 hours

Latest scheduled FDP endNot released by this calculatorExtensions, unforeseen circumstances and actual duty require separate handling

Assignment pathStandard lineholder table check

Fitness for dutyFit entered; operator affirmation still required

Operational authorityOperator release and current regulations control

Read before relying

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.

Rule set 1.1.0

Sources & scope

Verified

This page shows the source trail, jurisdiction and review date alongside the result. Always confirm time-sensitive rules with the linked authority.

CalcSpanPlain-date calculation method and input semanticsRetrieved 2026-08-20 Electronic Code of Federal Regulations14 CFR 117.5 — fitness for dutyRetrieved 2026-08-20 Electronic Code of Federal Regulations14 CFR 117.13 — unaugmented flight duty period and acclimation adjustmentRetrieved 2026-08-20 Electronic Code of Federal Regulations14 CFR 117.17 — augmented flightcrew FDP and rest conditionsRetrieved 2026-08-20 Electronic Code of Federal RegulationsTable B to Part 117 — unaugmented operationsRetrieved 2026-08-20 Electronic Code of Federal RegulationsTable C to Part 117 — augmented operationsRetrieved 2026-08-20

JurisdictionUnited States Part 121 flightcrew planning — current 14 CFR Part 117 Tables B/C, acclimation, facilities, segments, operator release and fitness control

Review date2027-02-21

PrivacyNo input upload

Questions answered

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.

Flight Duty Period Calculator without the guesswork.