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The FAA’s move comes eight months after Boeing sent a service bulletin in July to operators of about 860 potentially affected 737 Max-8 and -9s worldwide, providing them with instructions to ...
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.
A type certificate (TC) is issued to signify the airworthiness of the approved design or "type" of an aircraft to be manufactured. The TC is issued by a regulatory authority, and once issued, the design cannot be changed unless at least part of the process for certification is repeated to cover the changes.
The airworthiness certificate must be carried on board the aircraft and must be presented to a representative of the aviation authority upon request. A standard airworthiness certificate remains valid as long as the aircraft meets its approved type design and is in a condition for safe operation.
In the U.S., the MAX shares a compatible type rating throughout the Boeing 737 series. [25] The impetus for Boeing to build the 737 MAX was serious competition from the Airbus A320neo, which was a threat to win a major order for aircraft from American Airlines, a traditional customer for Boeing airplanes. [26]
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)).
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.
In application, airworthiness standards include a probability of loss of aircraft (PLOA) that is designed to be controllable (PLOAdc) as an overall attribute. [5] Setting a sufficiently robust PLOA factor for the aircraft's ability to safely attain, sustain, and terminate flight protects the souls on board.