easa ftl calculator

What this EASA FTL calculator is for

This page helps flight crew and schedulers make a fast, practical estimate of duty legality under EASA Flight Time Limitations (FTL). It focuses on the core idea most people need first: maximum FDP from report time, adjusted by number of sectors, and optionally adjusted for planned extension or split duty credit.

If you also enter an actual duty-end time, the calculator compares actual FDP against the estimated limit and gives a simple compliant / not compliant indication.

Inputs explained

1) Report time

Report time drives the base FDP window. Under EASA concepts, duties that start in biologically disruptive windows typically have tighter limits than daytime starts.

2) Number of sectors

As sectors increase, workload increases. This calculator applies a reduction from the base FDP after the first two sectors.

• 1–2 sectors: no sector penalty
• 3 sectors: -30 minutes
• 4 sectors: -60 minutes
• 5 sectors: -90 minutes (and so on)

3) Planned extension

Some operations permit planned FDP extension with limits and conditions. Checking this option adds 60 minutes for estimation. Always confirm frequency limits and requirements in your OM.

4) Split duty extension

Split duty can add FDP credit when suitable rest facilities and break structure exist. Enter the approved extension minutes from your planning method.

5) Actual duty end (optional)

Add actual end time to evaluate whether the duty remained within the estimated legal cap and to derive a simple minimum rest target (max of 12 hours or duty duration).

How the calculator estimates FDP

The logic follows an approximate EASA-style approach for acclimatised crew:

• Determine base FDP from report-time band.
• Reduce for sectors above two.
• Add planned extension (if selected).
• Add split duty extension minutes (if entered).
• Compute latest legal duty-end timestamp.

This gives a quick operational estimate. For legal release and post-ops validation, use official company systems and the exact regulatory references in your operation.

Operational caveats you should not ignore

• Acclimatisation: Non-acclimatised states can significantly change duty limits.
• WOCL impact: Duties touching the Window of Circadian Low may require stricter handling.
• Standby and reserve: Airport standby and certain reserve patterns alter available FDP.
• In-flight rest / augmented crew: Different tables and rules may apply.
• Commander’s discretion: Not a planning tool; use only within legal post-hoc framework and reporting requirements.

Best practices for crew and schedulers

• Run this estimate during roster design, not only on the day of operation.
• Track rolling duty and rest trends, not single-day legality only.
• Keep notes on delays and extension triggers for post-flight reporting.
• Escalate repeated fatigue-risk patterns to safety and FRM channels.

FAQ

Is this an official legal calculator?

No. It is an educational planning aid designed to mirror common EASA FTL calculation flow.

Can I use this for commander’s discretion decisions?

You can use it for context, but discretion is a regulated operational judgment with strict conditions, documentation, and company procedures.

Why might company software show a different result?

Company software can include additional variables like timezone transitions, acclimatisation algorithms, airport standby offsets, route-specific controls, and FRMS overlays.