{"id":"F2006B06401","name":"AD/PW-P/13 - Piston Pin - Replacement","slug":"ad-pw-p-13-piston-pin-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47725,"registerId":"commonwealth-F2006B06401-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PW-P/13 - Piston Pin - Replacement","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 Piston Engines\n\n \n\nAD/PW-P/13 Piston Pin - Replacement NK\n\nApplicability: Wasp Junior and R985 engines used in agricultural operations. Document:  Pratt & Whitney SB 1730.\n\nCompliance: Before installation in an aircraft following next overhaul completed after 1 March 1965.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1538},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow technical scope, addressing only the specific safety issue of piston pin replacement in designated Pratt & Whitney engines used for agricultural operations."},"complexity_factors":["Single, unambiguous compliance requirement","No defined terms or interpretation section","Minimal cross-referencing (only one external service bulletin)","Narrow applicability limited to two specific engine models in agricultural use","No exceptions, exemptions, or conditional logic"],"plain_english_summary":"**What it does:**\nThis rule requires replacement of piston pins in specific Pratt & Whitney aircraft engines to prevent mechanical failure.\n\n**Who it affects:**\n*   Operators of aircraft using **Pratt & Whitney Wasp Junior** or **R985** engines\n*   Only applies when these engines are used for **agricultural operations** (crop dusting, aerial spraying, etc.)\n\n**When you must comply:**\nThe replacement must happen **before installing the engine** in an aircraft, specifically after the engine's next overhaul that takes place **after 1 March 1965**.\n\n**Why it matters:**\nPiston pins connect the piston to the connecting rod in an engine. If they fail, the engine can seize or break apart—particularly dangerous during low-level agricultural flying. This directive mandates a safety upgrade outlined in Pratt & Whitney Service Bulletin 1730.\n\n**Key document referenced:**\n*Pratt & Whitney SB 1730* (the manufacturer's technical service bulletin specifying the replacement procedure)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pw-p-13-piston-pin-replacement","history":"/api/acts/ad-pw-p-13-piston-pin-replacement/history","analysis":"/api/acts/ad-pw-p-13-piston-pin-replacement/analysis","conflicts":"/api/acts/ad-pw-p-13-piston-pin-replacement/conflicts","importantCases":"/api/acts/ad-pw-p-13-piston-pin-replacement/important-cases","documents":"/api/acts/ad-pw-p-13-piston-pin-replacement/documents"}}