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Sometimes during service, the aircraft may encounter problems that may compromise the aircraft's safety, which are not anticipated or detected in prototype testing stages. The aircraft design is thus compromised. The regulators will now issue an airworthiness directive to the type certificate holder and to all owners globally.
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.
Between 1975 and 1993 a series of Boeing service bulletins and FAA airworthiness directives were published to address the midspar cracks. These included initial inspections on the No. 2 and No. 3 engine midspar fittings, followed by repetitive visual inspections.
On November 18, 2020, after the FAA cleared the MAX for return to service in the U.S., EASA indicated that it would shortly issue its own proposed airworthiness directive. After the 28-day public comment period, the final directive would then be published in late December 2020 or early in 2021. [257]
An emergency airworthiness directive (EAD) is an airworthiness directive issued when unsafe conditions require immediate action by an aircraft owner or operator. An EAD is published by a responsible authority such as the FOCA, EASA or FAA related to airworthiness and maintenance of aircraft and aircraft parts. It contains measures which must be ...
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.
The aircraft has been relatively free of Service Bulletins and Airworthiness Directives and has proved exceedingly effective in competition at all levels. [ citation needed ] The obvious capabilities of the aircraft and its success in use, together with the relatively large numbers built (about 250) have meant that owners make relatively few ...
Prototype and initial production version. 400 kg gross weight. Retrofit of PIK-20B flap-aileron interconnect permitted under a service bulletin. Retrofit of PIK-20B enlarged water ballast bags and corresponding 450 kg gross weight permitted under a service bulletin. [2] PIK 20B. Refined standard class sailplane with interconnected flaps and ...