KZHEL — Creator and Editor of USFITools

KZHEL is an independent aviation-focused publisher with a background in the aviation field, and the creator and editor of USFITools, an independent aviation-focused website dedicated to providing practical calculators, educational guides and accessible aviation learning resources. The content draws on an aviation-related background and references established aviation publications to help make technical subjects clearer for readers.

What KZHEL creates and maintains

• The USFITools aviation calculators, including the METAR and TAF decoder, crosswind calculator, density altitude calculator and flight planning tools.
• The aviation guides, which explain the concepts behind the tools with worked examples.
• The aircraft dispatcher practice test and its explanations.

How the content is checked

• Each guide lists the official or established publications it is based on, such as FAA handbooks, the Aeronautical Information Manual, 14 CFR and ICAO documents.
• Calculators are tested against hand-worked examples and reference values before publication and after changes.
• Rules are always given with the jurisdiction they apply to, because aviation regulations differ between countries.
• Live weather comes from AviationWeather.gov and airport data from the OurAirports dataset; their sources are shown on the tools.

Corrections and updates

Readers can report errors through the contact page. Reports are checked against the original references, confirmed errors are corrected, and the guide’s “last reviewed and updated” date changes when it is revised.

Independence

USFITools is an independent project. It is not affiliated with, or endorsed by, any airline, airport, air navigation service provider, training organisation or aviation authority. Its tools and guides are for education and cross-checking, not for operational flight planning. See the disclaimer.