{"id":"F2006B10344","name":"AD/HILLER 12/12 Amdt 2 - Main Rotor Blades - Inspection","slug":"ad-hiller-12-12-amdt-2-main-rotor-blades-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56102,"registerId":"commonwealth-F2006B10344-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HILLER 12/12 Amdt 2 - Main Rotor Blades - 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)  Hiller UH-12 Series Helicopters\n\n \n\nAD/HILLER 12/12\n\nAmdt 2\n\n\nMain Rotor Blades - Inspection 4/66\n\n \n\nApplicability: All models UH-12D, 12E, 12F and 12G. Document:  Hiller SIL No. 3037C.\n\nCompliance: As detailed in the requirement document.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is titled as Amendment 2 (Amdt 2), indicating it modifies a prior airworthiness directive. In the supplied text the amendment maintains a targeted scope — main rotor blade inspection for UH-12D/E/F/G — and accomplishes its effect by referencing Hiller SIL No. 3037C for the detailed inspection requirements (Amdt 2; Applicability; Document; Compliance). The supplied snippet does not provide the prior text, so the exact nature of the changes to requirements or procedures relative to the earlier version cannot be determined from the material provided."},"complexity_factors":["Narrow applicability — limited to UH-12D, 12E, 12F and 12G (reduces scope complexity) (Applicability).","Substantive requirements are external — the AD refers to Hiller SIL No. 3037C for procedural detail, meaning the AD itself contains no step-by-step instructions (Document; Compliance).","Lack of timing/detail in the AD — the compliance timing and specific inspection tasks are not included in the supplied text, increasing operational dependence on the external document (Compliance).","Regulatory provenance is clear — issued under CASA and Part 39 airworthiness directives, so enforcement pathway is established (CASA header; Schedule of Airworthiness Directives).","The instrument is an amendment (Amdt 2), implying change from a prior directive, which can require operators to reconcile versions (Amdt 2)."],"plain_english_summary":"This CASA airworthiness directive requires main rotor blade inspections for all Hiller UH‑12D, 12E, 12F and 12G helicopters and delegates the inspection procedures and schedule to Hiller Service Information Letter No. 3037C.\n\nOwners and operators must obtain and follow that SIL to comply; the AD itself contains no inspection intervals or technical steps, so compliance burden, costs and enforcement rely on the referenced manufacturer document."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive maintaining its original purpose of ensuring airworthiness of specific helicopter rotor blades. As Amendment 2, it represents an update to existing requirements rather than scope creep. The instrument remains tightly focused on its original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section—all terminology is standard aviation terminology","No conditional logic or nested exceptions","Single cross-reference to external document (Hiller SIL No. 3037C) which contains the actual technical requirements","Simple applicability clause listing specific aircraft models","No procedural complexity within the instrument itself—all technical detail outsourced to the referenced Service Information Letter"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by the Civil Aviation Safety Authority (CASA) for specific Hiller helicopters. It mandates safety inspections of the main rotor blades on UH-12D, 12E, 12F, and 12G model helicopters.\n\n**What it does:**\n- Requires operators and owners of affected Hiller helicopters to inspect their main rotor blades according to procedures outlined in Hiller Service Information Letter (SIL) No. 3037C.\n- The directive is **Amendment 2** (Amdt 2), meaning it updates a previous version of this safety requirement.\n\n**Who it affects:**\n- Owners and operators of Hiller UH-12D, UH-12E, UH-12F, and UH-12G helicopters.\n- Maintenance organisations servicing these aircraft.\n\n**Why it matters:**\nMain rotor blades are critical components—if they fail, the helicopter cannot fly and may crash. This directive ensures potential defects or wear are detected before they cause accidents. Compliance is mandatory under Australian civil aviation law."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hiller-12-12-amdt-2-main-rotor-blades-inspection","history":"/api/acts/ad-hiller-12-12-amdt-2-main-rotor-blades-inspection/history","analysis":"/api/acts/ad-hiller-12-12-amdt-2-main-rotor-blades-inspection/analysis","conflicts":"/api/acts/ad-hiller-12-12-amdt-2-main-rotor-blades-inspection/conflicts","importantCases":"/api/acts/ad-hiller-12-12-amdt-2-main-rotor-blades-inspection/important-cases","documents":"/api/acts/ad-hiller-12-12-amdt-2-main-rotor-blades-inspection/documents"}}