{"id":"F2006B10978","name":"AD/JT8D/16 Amdt 2 - Second Stage Fan Blades","slug":"ad-jt8d-16-amdt-2-second-stage-fan-blades","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56560,"registerId":"commonwealth-F2006B10978-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT8D/16 Amdt 2 - Second Stage Fan Blades","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPratt and Whitney Turbine Engines \\- JT8D Series\n\nAD/JT8D/16\n\nAmdt 2\n\n  \nSecond Stage Fan Blades 4/90\n\nApplicability: All JT8D engines incorporating 2nd stage fan blades P/N 433802, 645902, 759902, 695932, 678102, 746402 or blade assemblies P/N 645732, 759922, 676222, 745532.\n\nRequirement: Inspect second stage fan blade root attachments for cracking in accordance with PWA ASB No 5729 Rev 2, or as agreed by the Authority.\n\nNote: FAA AD 87-14-01 R1 refers.\n\nCompliance: Prior to 10,000 cycles since new or since compliance with Amendment 1 of this Directive, and thereafter at intervals not to exceed 10,000 cycles.\n\nBackground: This Directive has been amended to reflect the manufacturers latest revision to the Requirement document. The revision, in part, adds a fluorescent penetrant inspection requirement.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1944},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 2 expanded the original directive's requirements by adding mandatory fluorescent penetrant inspection methods, as noted in the background section stating the revision 'adds a fluorescent penetrant inspection requirement' beyond the original scope."},"complexity_factors":["Incorporates external technical document PWA ASB No 5729 Rev 2 by reference without reproducing its contents","Conditional compliance timing based on engine cycle history ('prior to 10,000 cycles since new or since compliance with Amendment 1')","Seven specific part numbers and four assembly part numbers in applicability section","Technical aviation terminology requiring domain knowledge ('cycles', 'fluorescent penetrant inspection', 'root attachments')","Reference to corresponding foreign regulation (FAA AD 87-14-01 R1)"],"plain_english_summary":"This directive requires operators of Pratt & Whitney JT8D engines with certain second‑stage fan blades to inspect blade root attachments for cracking using fluorescent penetrant inspection per the manufacturer's service bulletin (unless CASA approves an alternative). The initial inspection must occur before 10,000 flight cycles (or under the prior rule’s check) and repeat every 10,000 cycles. It aims to detect cracks early and prevent catastrophic engine failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt8d-16-amdt-2-second-stage-fan-blades","history":"/api/acts/ad-jt8d-16-amdt-2-second-stage-fan-blades/history","analysis":"/api/acts/ad-jt8d-16-amdt-2-second-stage-fan-blades/analysis","conflicts":"/api/acts/ad-jt8d-16-amdt-2-second-stage-fan-blades/conflicts","importantCases":"/api/acts/ad-jt8d-16-amdt-2-second-stage-fan-blades/important-cases","documents":"/api/acts/ad-jt8d-16-amdt-2-second-stage-fan-blades/documents"}}