{"id":"F2006B06258","name":"AD/PL 12/12 Amdt 3 - Cockpit Overturn Structure","slug":"ad-pl-12-12-amdt-3-cockpit-overturn-structure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47249,"registerId":"commonwealth-F2006B06258-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PL 12/12 Amdt 3 - Cockpit Overturn Structure","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)  Transavia PL 12 Series Aeroplanes\n\n \n\nAD/PL 12/12\n\nAmdt 3\n\n\nCockpit Overturn Structure 2/89\n\n \n\nApplicability: PL 12 with S/Nos prior to G466.\n\n \n\nRequirement: Action in accordance with Transavia SB No. 26. Compliance: Before 1 February 1975.\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 Amendment 3 to an existing Airworthiness Directive originally issued in 1989 (as indicated by '2/89' in the title). The scope remains tightly focused on the original safety issue — cockpit overturn structure integrity for specific Transavia PL 12 aircraft. There is no evidence of scope creep; amendments likely addressed administrative updates or minor technical clarifications rather than expanding coverage to new aircraft systems or types."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 substantive requirements: applicability criteria and compliance action","Single cross-reference to manufacturer service bulletin (SB No. 26)","No defined terms section","No conditional logic or nested exceptions","Clear, fixed deadline (1 February 1975)","Straightforward applicability (serial number cut-off)"],"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 specific Transavia PL 12 series aeroplanes (small agricultural aircraft) with serial numbers before G466.\n\n**What it requires:**\n- Owners/operators must carry out specific maintenance or inspection work on the **cockpit overturn structure** (the protective frame designed to protect pilots if the aircraft flips over)\n- The work must follow instructions in **Transavia Service Bulletin No. 26** (a manufacturer-issued technical notice)\n- **Deadline:** Before 1 February 1975\n\n**Why it matters:**\nThis directive addresses a safety defect in the cockpit protection structure. Without this fix, pilots faced higher risk of injury in rollover accidents — a significant hazard in agricultural aviation where low-level flying and rough terrain are common. Compliance is legally mandatory; flying without completing this work would breach civil aviation regulations."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD text sets a targeted requirement for PL 12 aeroplanes with serial numbers prior to G466 and mandates action per Transavia SB No. 26 by the specified date. The instrument, as presented, does not include any indication that its applicability or required action has been expanded, narrowed, or otherwise altered from an earlier version; therefore there is no evidence in this text that the scope has changed from the AD’s stated operative requirements (Applicability; Requirement; Compliance)."},"complexity_factors":["Direct cross-reference to an external document (Transavia SB No. 26) for technical content increases procedural dependency.","Serial-number cutoff (S/N prior to G466) requires per-aircraft applicability checking by operators.","No technical details in the AD itself — implementers must obtain and interpret a separate service bulletin.","A fixed compliance deadline is specified, creating scheduling and logistical requirements for operators.","Limited scope and short text reduce legal ambiguity but shift practical complexity to maintenance execution and record-keeping."],"plain_english_summary":"This Airworthiness Directive mandates that owners/operators of Transavia PL 12 aeroplanes with serial numbers prior to G466 comply with the actions specified in Transavia Service Bulletin No. 26 to address the cockpit overturn structure, with work completed before 1 February 1975. \n\nThe regulator prescribes the requirement; affected operators must arrange and pay for the inspection/repairs per the service bulletin. The AD defers technical detail to the manufacturer’s bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pl-12-12-amdt-3-cockpit-overturn-structure","history":"/api/acts/ad-pl-12-12-amdt-3-cockpit-overturn-structure/history","analysis":"/api/acts/ad-pl-12-12-amdt-3-cockpit-overturn-structure/analysis","conflicts":"/api/acts/ad-pl-12-12-amdt-3-cockpit-overturn-structure/conflicts","importantCases":"/api/acts/ad-pl-12-12-amdt-3-cockpit-overturn-structure/important-cases","documents":"/api/acts/ad-pl-12-12-amdt-3-cockpit-overturn-structure/documents"}}