{"id":"F2006B06353","name":"AD/PT6A/12 - Improved Wire Rope Reversing Cable","slug":"ad-pt6a-12-improved-wire-rope-reversing-cable","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47572,"registerId":"commonwealth-F2006B06353-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PT6A/12 - Improved Wire Rope Reversing Cable","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/12 Improved Wire Rope Reversing Cable 10/85\n\nApplicability:  All PT6A-27 engines prior to S/N PC-E40273 except E40028, 40029, 40144, 40157, 40186, 40187, 40226, 40228, 40229 and 40241 to 40247, and PT6A-28 engines prior to S/No. PC-E50027.\n\n \n\nDocument: 1. UACL SB No. 173, Rev. 2; or\n\n \n\n2.    UACL SB No. 1126; or\n\n \n\n3.    AD/UAC-T/10A.\n\n \n\nCompliance: Before installation in an aircraft following next reconditioning completed after 31 December 1971.\n\n \n\nNote: The above AD number has been corrected with the addition of the letter “A” which had been inadvertently omitted from previous up-dates.\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":2149},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This remains a targeted, technical safety directive limited to the specific wire rope reversing cable modification for identified PT6A engine models. There is no evidence of scope creep beyond the original safety purpose."},"complexity_factors":["Specific serial number applicability with multiple explicit exclusions (11 separate serial numbers excluded from PT6A-27 range)","Conditional compliance trigger based on reconditioning date (after 31 December 1971)","Cross-references to three separate technical documents for implementation details","Administrative correction note regarding directive identifier"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners and maintenance organisations to fit an improved wire rope reversing cable to specified Pratt & Whitney PT6A-27 and PT6A-28 turbine engines before reinstalling them after overhaul (if the overhaul was completed after 31 Dec 1971). It applies to PT6A-27 engines built before SN PC‑E40273 (with 11 specific engines excluded) and PT6A-28 engines built before SN PC‑E50027, per P&W Service Bulletins 173 Rev 2, 1126, or AD/UAC‑T/10A. The change prevents reverse‑thrust cable failures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6a-12-improved-wire-rope-reversing-cable","history":"/api/acts/ad-pt6a-12-improved-wire-rope-reversing-cable/history","analysis":"/api/acts/ad-pt6a-12-improved-wire-rope-reversing-cable/analysis","conflicts":"/api/acts/ad-pt6a-12-improved-wire-rope-reversing-cable/conflicts","importantCases":"/api/acts/ad-pt6a-12-improved-wire-rope-reversing-cable/important-cases","documents":"/api/acts/ad-pt6a-12-improved-wire-rope-reversing-cable/documents"}}