Aircraft Tech Log Calculator | Left Seat Culture

AIRCRAFT TECH LOG CALCULATOR

Flight time in. Tech log figures out.

v1.0.0 LEFT SEAT CULTURE TOOL Runs in your browser

Arithmetic assistant — not an airworthiness decision

This tool calculates times from the figures you enter. Use the time basis, maintenance interval and recording method specified for the actual aircraft, its records and maintenance programme. A result does not determine whether an aircraft is serviceable or legally permitted to fly.

What do you want to calculate?

Choose the quickest route for what you are doing now.

After a flightUse take-off and landing times to calculate the entry and maintenance time left. Quick subtractionYou already know the flight duration and just want the new time remaining. Before a flightSee how much entered maintenance time would remain after a planned flight.

Aircraft and time format

Optional aircraft details can be remembered on this device.

Aircraft registration Time format

Remember aircraft setup on this deviceOnly registration, time format and maintenance tracker names/values are stored locally in your browser.

Flight details

Enter the times from the flight. Midnight crossings are handled automatically.

From To Take-off time Landing time

Full-stop landings Touch-and-goes / other movements

Times entered here are treated as clock times for arithmetic only. Your aircraft may use a different time basis for maintenance or official records.

Maintenance time remaining

Add the countdowns shown in your aircraft's own records. You can track more than one.

Important: do not assume a particular 50-hour, 100-hour or other interval applies just because it appears as an example here. Enter what the aircraft's maintenance records/programme actually use.

Optional tech log details

These do not affect the time calculation, but can be included in the copyable summary.

Fuel uploaded Fuel after flight Defects / notes

WHY THE TOOL DOESN'T ASSUME “50 HOURS”

Different aircraft can use different maintenance arrangements

Part-ML aircraft

UK CAA Part-ML uses an aircraft maintenance programme (AMP). The programme may be based on design approval holder data or the Part-ML minimum inspection programme, so the tool asks you to enter the countdown actually used for the aircraft rather than assigning one itself.

CAA Part-ML guidance ↗

Microlights and permit aircraft

Maintenance requirements can come from the applicable aircraft/engine information, BMAA schedules, TADS, mandatory permit directives and other approved material. Individual tasks may therefore have different hour or calendar intervals.

BMAA technical information ↗

What does this calculator decide?

Only arithmetic. It can subtract a flight duration from a time-remaining figure and highlight when the entered duration meets or exceeds it. It does not extend maintenance intervals, interpret tolerances, defer defects, or declare an aircraft airworthy.

HH:MM versus decimal time

1:30 is 1.5 decimal hours. Decimal hours are not ordinary minutes: 1.30 decimal hours is 1 hour 18 minutes. Choose the format that matches the aircraft record and let the calculator handle the conversion internally.

Detailed disclaimer and data handling

This is a convenience calculator for pilots, aircraft owners and group members. It is not an aircraft technical log, journey log, maintenance programme, continuing-airworthiness system or release-to-service record. Values are calculated from user-entered data and may be wrong if the inputs, time basis or maintenance figures are wrong. Local-save data, when enabled, is stored only in this browser's local storage; flight details are not saved by this tool.