{"id":"F2006B04188","name":"AD/BEECH 77/12 - Engine Mount Assembly and Engine Control Linkage","slug":"ad-beech-77-12-engine-mount-assembly-and-engine-control-linkage","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43942,"registerId":"commonwealth-F2006B04188-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 77/12 - Engine Mount Assembly and Engine Control Linkage","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)  Beechcraft 77 (Skipper) Series Aeroplanes\n\n \n\nAD/BEECH 77/12 Engine Mount Assembly and Engine Control Linkage\n\nApplicability: All models 77 with S/Nos. WA-1 to WA-312.\n\n \n\nRequirement: Action in accordance with Beechcraft Service Instruction No. 1233.\n\n \n\nCompliance: Within 100 hours’ time in service after 28 February 1983 unless previously accomplished.\n\n \n\nBackground: Cracking of engine mount assembly has been experienced.\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\n2/83\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1571},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope targeting specific Beechcraft 77 aircraft models for a defined safety issue regarding engine mount cracking. There is no evidence of scope creep beyond the original safety concern."},"complexity_factors":["Extremely brief instrument (approximately 50 words of substantive text)","Single applicability criterion (specific aircraft serial numbers WA-1 to WA-312)","No defined terms or interpretation section","No internal divisions, parts, or sections","Incorporates external technical document by reference (Service Instruction No. 1233) without reproducing its content"],"plain_english_summary":"**What this does:** This is a mandatory safety directive for owners and operators of specific Beechcraft 77 (Skipper) aeroplanes. If your aircraft has serial numbers between WA-1 and WA-312, you must inspect and repair the engine mount assembly and engine control linkage.\n\n**Why it matters:** Cracks have been discovered in the engine mount assembly (the structure that holds the engine to the airframe). This is a serious safety risk because engine mount failure could cause the engine to detach from the aircraft.\n\n**What you must do:** Follow the procedures in *Beechcraft Service Instruction No. 1233* (a technical manual from the manufacturer). You must complete this work within 100 hours of flight time after 28 February 1983, unless you've already done it.\n\n**Who it affects:** Anyone operating the specific Beechcraft 77 models listed above, registered in Australia under the Civil Aviation Regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-77-12-engine-mount-assembly-and-engine-control-linkage","history":"/api/acts/ad-beech-77-12-engine-mount-assembly-and-engine-control-linkage/history","analysis":"/api/acts/ad-beech-77-12-engine-mount-assembly-and-engine-control-linkage/analysis","conflicts":"/api/acts/ad-beech-77-12-engine-mount-assembly-and-engine-control-linkage/conflicts","importantCases":"/api/acts/ad-beech-77-12-engine-mount-assembly-and-engine-control-linkage/important-cases","documents":"/api/acts/ad-beech-77-12-engine-mount-assembly-and-engine-control-linkage/documents"}}