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Glossary

What is an airworthiness directive?

A mandatory instruction from a civil aviation authority requiring an inspection or modification on a type. Ask which ones apply and whether they have been carried out. Compliance is not optional and it can ground an aircraft.

Also called AD

That is the whole entry for now. The longer version, with the mechanics and worked examples, is still to be written. See autorotation for how those read once they exist.

All glossary terms