{"id":"F2006B06114","name":"AD/PC-6/12 - Elevator Assembly - Modification","slug":"ad-pc-6-12-elevator-assembly-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46871,"registerId":"commonwealth-F2006B06114-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-6/12 - Elevator Assembly - Modification","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)  Pilatus Porter PC-6 Series Aeroplanes\n\n \n\nAD/PC-6/12 Elevator Assembly - Modification 8/66\n\nApplicability: All models prior to S/No. 586. Document: Pilatus SB No. 50.\n\nCompliance: Before 15 August 1966.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a single purpose: mandating a specific mechanical modification to a defined aircraft population. There is no evidence of scope creep; it does exactly what it says on the tin."},"complexity_factors":["Extremely short document — approximately 100 words of substantive content","No defined terms section","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance requirement (follow Service Bulletin No. 50 by fixed date)","Clear applicability criteria (specific aircraft serial number cutoff)","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for a specific aircraft type.\n\n**What it does:** It requires owners and operators of **Pilatus Porter PC-6 series aeroplanes** (specifically those built before serial number 586) to modify the **elevator assembly** — that's the part of the tail that controls whether the plane pitches up or down.\n\n**Who must comply:** Anyone operating these specific aircraft models. The directive applies to \"all models prior to S/No. 586\" — meaning older aircraft in this series.\n\n**How to comply:** Operators must follow **Pilatus Service Bulletin No. 50** — this is the manufacturer's official instruction manual for making the required change. The work had to be completed **before 15 August 1966**.\n\n**Why it matters:** Airworthiness directives are legally binding safety fixes. They typically issue when a design flaw, wear pattern, or incident reveals a risk of mechanical failure. Non-compliance means the aircraft cannot legally fly. This particular directive is historical (dating to 1966), but illustrates how aviation safety works: when a problem is found, regulators ground affected fleets until fixes are proven."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument requires a specific modification to the elevator assembly for Pilatus PC-6 aeroplanes with serial numbers before 586, to be carried out in accordance with Pilatus SB No. 50 by 15 August 1966. The text shows a narrowly targeted, time-limited requirement; there is no indication in the AD text itself that the scope has been broadened or narrowed from an earlier or different intent."},"complexity_factors":["Narrow and specific applicability limited to serial numbers prior to S/No. 586 (low scope breadth).","Single prescriptive action: modification of the elevator assembly (simple mandate).","Dependence on an external technical document (Pilatus SB No. 50) for the procedural details (adds operational complexity).","Fixed compliance deadline creates scheduling and supply risks for affected operators.","Enforcement sits with the regulator under the Civil Aviation Regulations framework (administrative compliance and record-keeping obligations)."],"plain_english_summary":"This AD mandates a physical modification to the elevator assembly on Pilatus PC‑6 aeroplanes serial numbers before 586, to be done per Pilatus SB No. 50. Compliance was required by 15 August 1966; owners/operators must arrange and pay for the work, and the Civil Aviation Safety Authority enforces the directive — affecting operations and safety until modification is completed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-12-elevator-assembly-modification","history":"/api/acts/ad-pc-6-12-elevator-assembly-modification/history","analysis":"/api/acts/ad-pc-6-12-elevator-assembly-modification/analysis","conflicts":"/api/acts/ad-pc-6-12-elevator-assembly-modification/conflicts","importantCases":"/api/acts/ad-pc-6-12-elevator-assembly-modification/important-cases","documents":"/api/acts/ad-pc-6-12-elevator-assembly-modification/documents"}}