Calculate your duty times, fuel uplifts and fuel tankering easy and fast. To use the app, read the full text of instructions. Purpose of AviationCalc: Flight Duty Period Page: AviationCalc helps you calculate Maximum Duty Periods and Total Duty Periods, correcting for time zones from the start of duty location and end of duty time zone. Also, it will search maximum flight duty period for acclimatised crew of some of the most used regulatory institutions (Hong Kong CAD, Australian CAO, European EASA, and American FAA). Fuel Uplift Page: AviationCalc helps you calculate fuel uplift in Kg, USG and Litres to help you calculate your data fast and easy. Tankering Page: AviationCalc helps you calculate maximum fuel in Kg for your flight. Also calculating landing fuel and weight. It also features a way for you to save weight data limitations for the aircraft you're flying so you will quickly make your calculations. ***Disclamer*** The information this app presents should not be used as primary tool for your calculations. Allowing the app access your location will only allow the app to help get better precision on which Time Zone to use. Click on info button (bottom right) to pull up how-to-use alerts or whenever you want to change the regulatory institution or choose a different time after flight duty for total duty period calculation. If there is something wrong going on, tap the screen again. Please leave your review.