Do not use this site as your sole source

The checklists, calculators, risk prompts and guides are general information. They do not replace an approved flight or operations manual, manufacturer instructions, formal training, engineering limits, weather briefing, airspace authorisation, regulator guidance, employer procedures or competent operational judgement.

Rules change

Regulations and operating requirements can change and vary by country, location, aircraft, weight, operation type and authorisation. Check the current official source before every operation where rules matter.

Calculations

Calculator outputs are planning estimates. Verify units, source inputs, reserves, limits and results independently before relying on them.