{"id":"F2006B10970","name":"AD/JT15D/7 Amdt 2 - Fan Blade Rub","slug":"ad-jt15d-7-amdt-2-fan-blade-rub","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56546,"registerId":"commonwealth-F2006B10970-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT15D/7 Amdt 2 - Fan Blade Rub","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 Canada Turbine Engines \\- JT15D Series\n\nAD/JT15D/7\n\nAmdt 2\n\n  \nFan Blade Rub 3/93\n\nApplicability: JT15D-4, \\-4B, \\-4D engines not incorporating Pratt and Whitney Canada Service Bulletin No. 7268 or 7300.\n\nRequirement: Inspect the low pressure compressor case inner diameter for evidence of fan blade rub.\n\nIf fan blade rub is evident:\n\n    Carry out a fan blade tip clearance check in accordance with PWC M/M P/N 3017542, chapter 72-30-53 and adjust as required.\n\n    2. Carry out a fluorescent penetrant inspection of the rub area.\n\n    3. If cracking of the low compressor case is evident, replace the low compressor case.\n\nNote 1: A fluorescent penetrant inspection shall be carried out by the holder of a valid NDT Authority.\n\nNote 2: Transport Canada Directive CF-88-03R1 refers.\n\nCompliance: Effective 4 March 1993; unless previously accomplished, within 25 hours time in service and thereafter at intervals not to exceed 300 hours time in service.\n\nBackground: This Directive has been amended to reflect the issue of PWC SB No. 7300. Engines incorporating a vibration damper ring as detailed in SB 7268 or 7300 are no longer applicable.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The Directive was amended to reflect PWC Service Bulletin No. 7300; engines incorporating a vibration damper ring as detailed in SB 7268 or 7300 are expressly removed from applicability, narrowing the affected population."},"complexity_factors":["Narrow applicability tied to specific engine models and exclusion when PWC SB 7268 or 7300 has been incorporated (affects which operators must comply).","Technical procedures are referenced externally (PWC Maintenance Manual P/N 3017542, chapter 72-30-53) rather than set out in the directive.","Requirement for a fluorescent penetrant inspection to be carried out by a holder of a valid NDT Authority increases compliance certification needs.","Short initial compliance window (25 hours TIS) and recurring 300‑hour intervals impose tight scheduling and operational impact.","Potential for part replacement (low compressor case) if cracking is found increases cost and downtime.","Cross-reference to manufacturer service bulletins and a Transport Canada directive requires cross-jurisdictional document checks."],"plain_english_summary":"This airworthiness directive requires operators of Pratt & Whitney Canada JT15D‑4, ‑4B and ‑4D engines (unless they have incorporated PWC Service Bulletin 7268 or 7300) to inspect the low‑pressure compressor case for fan blade rub. If rub is found, it mandates blade tip‑clearance adjustment per the PWC manual, a fluorescent penetrant inspection by a holder of an NDT Authority, and replacement of the low compressor case if cracked.\n\nCompliance is required within 25 hours time in service and then every 300 hours, creating inspection, certified NDT and potential replacement costs for affected operators."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment narrows rather than expands scope. The original directive applied more broadly; Amendment 2 specifically excludes engines that have been modified per Service Bulletins 7268 or 7300. The core safety purpose remains unchanged — preventing fan blade rub damage — but the amendment reflects updated technical knowledge that certain design improvements eliminate the risk."},"complexity_factors":["Single specific mechanical issue addressed (fan blade rub)","Only 3 engine models affected with clear applicability criteria","Straightforward conditional logic: if rub found → do 3 specific actions","Only 2 defined technical terms requiring clarification (Service Bulletin numbers)","Simple compliance timeline (initial + recurring intervals)","Minimal cross-referencing (one Canadian directive mentioned in background only)","No nested exceptions or complex definitional sections"],"plain_english_summary":"This AD mandates regular inspections of specific Pratt & Whitney Canada JT15D-4/-4B/-4D engines that lack certain factory modifications to detect \"fan blade rub\"—scraping between fan blades and the compressor case that can lead to structural damage and engine failure. Operators and maintenance personnel must inspect, have any rub areas NDT‑checked, and replace the compressor case if cracks are found.\n\nIt was amended after P&W issued a design fix; engines incorporating that fix are no longer subject to the inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt15d-7-amdt-2-fan-blade-rub","history":"/api/acts/ad-jt15d-7-amdt-2-fan-blade-rub/history","analysis":"/api/acts/ad-jt15d-7-amdt-2-fan-blade-rub/analysis","conflicts":"/api/acts/ad-jt15d-7-amdt-2-fan-blade-rub/conflicts","importantCases":"/api/acts/ad-jt15d-7-amdt-2-fan-blade-rub/important-cases","documents":"/api/acts/ad-jt15d-7-amdt-2-fan-blade-rub/documents"}}