{"id":"F2006B06356","name":"AD/PT6A/15 - Reversing Linkage Front End Clevis - Incorporation of Inspection Hole","slug":"ad-pt6a-15-reversing-linkage-front-end-clevis-incorporation-of-inspection-hole","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47582,"registerId":"commonwealth-F2006B06356-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PT6A/15 - Reversing Linkage Front End Clevis - Incorporation of Inspection Hole","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Pratt and Whitney Canada Turbine Engines - PT6A Series\n\n \n\nAD/PT6A/15  Reversing Linkage Front End Clevis - Incorporation of Inspection Hole\n\n\n10/85\n\n \n\nApplicability: PT6A-27, -28 engines incorporating solid link propeller reversing option prior to engine S/N PC-E40168 except S/N PC-E40153 and 40162.\n\n \n\nDocument: 1. UACL SB No. 166;\n\n \n\n2.    UACL SB No. 1119, or\n\n \n\n3.    AD/UAC-T/21.\n\n \n\nCompliance: Within 100 hours time in service after 31 October 1974.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2148},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope: a specific one-time modification to the reversing linkage clevis on specific PT6A engine variants. There is no evidence of scope expansion beyond the original safety-critical inspection requirement."},"complexity_factors":["Extremely short document (under 150 words)","Single, unambiguous compliance action (incorporate inspection hole)","Narrow applicability limited to specific engine models and serial number ranges","No conditional logic, exceptions, or nested provisions","Incorporation by reference of three technical documents for implementation details"],"plain_english_summary":"This AD requires owners/operators of certain Pratt & Whitney Canada PT6A-27 and -28 engines (with the solid‑link propeller reversing option and pre‑PC‑E40168 serials, excluding PC‑E40153 and PC‑E40162) to add an inspection hole to the reversing‑linkage front‑end clevis so crews can visually check for cracks, corrosion, or wear without disassembly.\n\nThe modification must be done within 100 flight hours after 31 Oct 1974, following UAC Service Bulletins No. 166 or 1119 (or the prior AD)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6a-15-reversing-linkage-front-end-clevis-incorporation-of-inspection-hole","history":"/api/acts/ad-pt6a-15-reversing-linkage-front-end-clevis-incorporation-of-inspection-hole/history","analysis":"/api/acts/ad-pt6a-15-reversing-linkage-front-end-clevis-incorporation-of-inspection-hole/analysis","conflicts":"/api/acts/ad-pt6a-15-reversing-linkage-front-end-clevis-incorporation-of-inspection-hole/conflicts","importantCases":"/api/acts/ad-pt6a-15-reversing-linkage-front-end-clevis-incorporation-of-inspection-hole/important-cases","documents":"/api/acts/ad-pt6a-15-reversing-linkage-front-end-clevis-incorporation-of-inspection-hole/documents"}}