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An airworthiness directive (commonly abbreviated as AD) is a notification to owners and operators of certified aircraft that a known safety deficiency with a particular model of aircraft, engine, avionics or other system exists and must be corrected.
The airworthiness requirements for transport category (large civil aircraft, both airplanes and helicopters) are contained in Title 14, Code of Federal Regulations (14 CFR) part 25 (commonly referred to as part 25 of the Federal Aviation Regulations (FAR)).
The FAA also uses advisory circulars to officially recognize "acceptable means, but not the only means," of accomplishing or showing compliance with airworthiness regulations. [3] [4] Advisory circulars may also contain explanations, clarifications, best practices, or other information of use to the aviation community. [2] [5]
Where DERs find compliance, they certify that compliance by completing FAA Form 8110-3, Statement of Compliance with Airworthiness Standards for the specific configuration of the technical data they reviewed. [7] Form 8110-3 is the only FAA form that any DER may sign under their designated authority. [14]
One airworthiness regulation is found in ICAO international standard of Annex 8 to Chicago Convention on International Civil Aviation which defines "airworthy" - in respect of an aircraft, engine, propeller or part there of - as "The status of an aircraft, engine, propeller or part when it conforms to its approved design and is in a condition for safe operation".
A standard airworthiness certificate ceases to be valid when the aircraft ceases to be registered. Change of ownership of an aircraft does not require re-issue or re-validation of that aircraft's standard airworthiness certificate. In contrast to a standard airworthiness certificate, an aircraft may be issued with a special airworthiness ...
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"But perhaps most chillingly, we have learned that shortly after the issuance of the airworthiness directive, the FAA performed an analysis that concluded that, if left uncorrected, the MCAS design flaw in the 737 MAX could result in as many as 15 future fatal crashes over the life of the fleet—and that was assuming that 99 out of 100 flight ...