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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.
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.
Advisory circular (AC) refers to a type of publication offered by the Federal Aviation Administration (FAA) to "provide a single, uniform, agency-wide system … to deliver advisory (non-regulatory) material to the aviation community."
The CFM service bulletin recommended ultrasonic inspections of all fan blades on engines that had accumulated 20,000 engine cycles and subsequently at intervals not to exceed 3,000 engine cycles. The EAD required CFM56-7B engine fleet fan blade inspections for engines with 30,000 or greater cycles within 20 days of issuance, per the ...
In May 1996, the FAA Aviation Rulemaking Advisory Committee (ARAC) was tasked with a review of harmonized FAR/JAR 25.1309, AC 1309-1A, and related documents, and to consider revision to AC 1309-1A incorporating recent practice, increasing complex integration between aircraft functions and the systems that implement them, [20] and the ...
Technical Service Bulletins (TSBs) are document recommended procedures for repairing vehicles issued by a vehicle manufacturer when there are several occurrences of an unanticipated problem. [1] TSBs can range from vehicle-specific to covering entire product lines and break down the specified repair into a step-by-step process.
In July 2017, GE Aviation issued a Service Bulletin recommending that airlines perform regular inspections of first- and second-stage disks of all CF6 engines built before 2000. [ 12 ] On January 30, 2018, the National Transportation Safety Board (NTSB) issued its final report on the accident involving American 383. [ 1 ]
As of April 3, 2011, Boeing was developing a Service Bulletin for the inspection of similar aircraft. [16] On April 5, 2011, the FAA issued an emergency airworthiness directive (AD) requiring operators of 737 series 300, 400 and 500 aircraft to increase the frequency of inspections of lap joints on high flight cycle airframes. The AD requires ...