{"id":"F2006B09028","name":"AD/DHC-2/11 - Aileron Hinge Arm - Inspection","slug":"ad-dhc-2-11-aileron-hinge-arm-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52715,"registerId":"commonwealth-F2006B09028-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-2/11 - Aileron Hinge Arm - Inspection","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)  DHC-2 (Beaver) Series Aeroplanes\n\n \n\nAD/DHC-2/11 Aileron Hinge Arm - Inspection 3/65\n\nApplicability: All models with aileron hinge arms having more than 3000 hours time in service. Document:              Hawker de havilland TNS DHC-2 Aust. No. 3.\n\nCompliance: At intervals not exceeding 200 hours time in service.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused specifically on a known mechanical issue with a single aircraft type. It has not expanded beyond its original purpose of ensuring aileron hinge arm integrity through periodic inspection."},"complexity_factors":["Extremely short document — only 8 substantive lines of regulatory text","Single, clearly defined applicability criterion (3000+ hours time in service)","Single compliance action (inspection) with one unambiguous interval (200 hours)","No defined terms section, no cross-references to other legislation, no conditional exceptions","References only one external technical document (manufacturer's service notice)","No nested logic or alternative compliance methods"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to **DHC-2 Beaver aircraft** (a type of Canadian-built bush plane commonly used in Australia).\n\n**What it requires:**\n- **Who must comply:** Owners or operators of any DHC-2 Beaver model whose aileron hinge arms (the metal parts that connect the ailerons — the flaps on the wings that control rolling — to the wing structure) have accumulated **more than 3,000 flight hours**.\n- **What must be done:** These hinge arms must be **inspected** at regular intervals.\n- **How often:** No more than every **200 flight hours** (meaning the inspection is due before the aircraft reaches 200 hours of flying time since the last inspection).\n\n**Why it matters:**\nAileron hinge arms are critical structural components. If they fail in flight, the pilot could lose control of the aircraft's ability to bank or turn, potentially causing a crash. This AD was issued because of a known safety concern (referenced in a technical notice from the manufacturer, Hawker de Havilland). The repetitive inspection requirement suggests there may be a risk of fatigue cracking or wear that needs ongoing monitoring rather than a one-time fix.\n\n**In short:** If you fly an old DHC-2 Beaver with high-time hinge arms, you must get these specific parts checked roughly every 200 hours of flying, or the aircraft cannot legally fly in Australia."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"No change of scope is evident within the text supplied. The directive sets a clear applicability threshold (aileron hinge arms > 3,000 hours TIS) and a fixed compliance interval (inspections at intervals not exceeding 200 hours TIS) and references a specific Hawker de Havilland technical note for procedure. There is no text in the supplied instrument indicating an expansion or narrowing of scope from an earlier or alternate stated intent."},"complexity_factors":["Narrow, clearly stated applicability: applies only to DHC-2 aileron hinge arms with more than 3,000 hours TIS (low scope ambiguity).","Single, simple compliance requirement: recurring inspection at intervals not exceeding 200 hours TIS (numerical and easy to schedule).","Dependence on an external technical document (Hawker de Havilland TNS DHC-2 Aust. No. 3) for inspection procedure increases operational steps and creates reliance on that document for details not contained in the AD.","Lack of procedural detail in the AD itself about corrective actions or pass/fail criteria — these are deferred to the referenced document, adding an implementation step.","Administrative repetition: recurring inspections create ongoing scheduling and cost obligations once the 3,000‑hour threshold is crossed."],"plain_english_summary":"This CASA airworthiness directive mandates recurring inspections of aileron hinge arms on De Havilland DHC‑2 (Beaver) aeroplanes whose hinge arms have exceeded 3,000 hours TIS. Inspections must be carried out at intervals not exceeding 200 hours TIS, following the Hawker de Havilland TNS DHC‑2 Aust. No. 3 procedure. It affects owners/operators of impacted aircraft and is enforced under the Civil Aviation Regulations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-2-11-aileron-hinge-arm-inspection","history":"/api/acts/ad-dhc-2-11-aileron-hinge-arm-inspection/history","analysis":"/api/acts/ad-dhc-2-11-aileron-hinge-arm-inspection/analysis","conflicts":"/api/acts/ad-dhc-2-11-aileron-hinge-arm-inspection/conflicts","importantCases":"/api/acts/ad-dhc-2-11-aileron-hinge-arm-inspection/important-cases","documents":"/api/acts/ad-dhc-2-11-aileron-hinge-arm-inspection/documents"}}