{"id":"F2006B10363","name":"AD/HILLER 12/38 - Engine Mount Clevises","slug":"ad-hiller-12-38-engine-mount-clevises","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115981,"registerId":"commonwealth-F2006B10363-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HILLER 12/38 - Engine Mount Clevises","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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Hiller UH-12 Series Helicopters\n\n \n\nAD/HILLER 12/38 Engine Mount Clevises 11/85\n\nTX\n\nApplicability: All models UH-12D/E and E-4 turbine converted in accordance with STC SH177WE and SH178WE.\n\n \n\nRequirement: Action in accordance with Soloy conversions LTD SB 19-560.\n\n \n\nCompliance: Within 10 hours’ time in service after 26 September 1985 and thereafter as per Requirement Document.\n\n \n\nBackground: The manufacturer reports failures of the engine mount clevises.\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":1971},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope: addressing a specific reported failure mode (engine mount clevis fatigue/failure) on specific modified helicopter models. No expansion of scope is evident."},"complexity_factors":["Single, specific mechanical component addressed","Straightforward applicability criteria (specific aircraft models and modification status)","Single external reference to a service bulletin rather than complex legislative provisions","Clear compliance deadline (10 hours time in service)"],"plain_english_summary":"**What this does:** This is a mandatory safety order (called an Airworthiness Directive) for owners and operators of specific Hiller UH-12 helicopters that have been modified with turbine engines.\n\n**Who it affects:** Anyone who owns or operates Hiller UH-12D, UH-12E, or UH-12E-4 helicopters that were converted using specific Supplemental Type Certificates (STC numbers SH177WE and SH178WE).\n\n**What must be done:** The helicopter's engine mount clevises (metal fittings that connect the engine to the helicopter frame) must be inspected and/or replaced according to instructions in Soloy Conversions Service Bulletin 19-560. This must happen within 10 hours of flight time after 26 September 1985, and then repeated as specified in that bulletin.\n\n**Why it matters:** The manufacturer reported that these engine mount clevises were failing. If they break, the engine could detach from the helicopter during flight, which would be catastrophic."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hiller-12-38-engine-mount-clevises","history":"/api/acts/ad-hiller-12-38-engine-mount-clevises/history","analysis":"/api/acts/ad-hiller-12-38-engine-mount-clevises/analysis","conflicts":"/api/acts/ad-hiller-12-38-engine-mount-clevises/conflicts","importantCases":"/api/acts/ad-hiller-12-38-engine-mount-clevises/important-cases","documents":"/api/acts/ad-hiller-12-38-engine-mount-clevises/documents"}}