{"id":"F2006B06269","name":"AD/PL 12/4 - Stub Wing Structure - Inspection","slug":"ad-pl-12-4-stub-wing-structure-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47283,"registerId":"commonwealth-F2006B06269-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PL 12/4 - Stub Wing Structure - 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)  Transavia PL 12 Series Aeroplanes\n\n \n\nAD/PL 12/4 Stub Wing Structure - Inspection 12/68\n\nApplicability: All models.\n\n \n\nRequirement: Inspect the stub wing leading edge tube for cracking in the vicinity of landing gear attachment.\n\n \n\nCompliance: Within 100 hours time in service after 14 February 1969 and thereafter at intervals not exceeding 100 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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text sets a single, focused obligation: inspect the stub wing leading edge tube for cracking on all models and at fixed 100-hour intervals. There is no indication in the provided text that the scope has been altered from an earlier or original version; the directive as presented applies uniformly to all models and prescribes a single inspection requirement and interval. (Applicability; Requirement; Compliance)"},"complexity_factors":["Narrow technical scope: single structural component (stub wing leading edge tube) and single condition to check (cracking). (Requirement)","Clear, simple compliance interval specified (within 100 hours after 14 Feb 1969; every 100 hours thereafter). (Compliance)","Applies to all models—broad applicability but no model-specific exceptions or conditions. (Applicability)","No procedural detail provided: inspection method, acceptance criteria, or reporting process omitted, which introduces practical implementation discretion for maintainers. (Requirement)","No multiple, interlocking obligations, approvals, or variable timelines—single repeating obligation reduces administrative complexity. (Compliance)"],"plain_english_summary":"This AD mandates repetitive inspections for cracking of the stub wing leading‑edge tube at the landing‑gear attachment on all Transavia PL‑12 series aeroplanes. An initial check was required within 100 hours TIS after 14 February 1969 and must be repeated every 100 hours thereafter. Owners/operators fund the inspections and repairs; maintenance organisations must select appropriate inspection methods. Compliance is mandatory and creates recurring downtime and cost in exchange for earlier crack detection."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific known defect in a specific aircraft type. It has not expanded beyond its original purpose of ensuring structural integrity of the stub wing/landing gear attachment area."},"complexity_factors":["Single, specific mechanical component identified (stub wing leading edge tube)","Single inspection task (visual check for cracking)","Simple compliance schedule (100 hours initial, then recurring every 100 hours)","No defined terms section","No cross-references to other legislation or technical standards","No conditional logic or exceptions","Total length: approximately 100 words of substantive content","Applies universally to 'all models' of a single aircraft type — no complex applicability matrix"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of **Transavia PL-12 series aircraft** (a type of agricultural aeroplane) to inspect a specific part of the plane — the **stub wing leading edge tube** — for cracks near where the landing gear attaches.\n\n**Who it affects:** Anyone who owns, operates, or maintains a Transavia PL-12 aircraft in Australia.\n\n**What must be done:**\n- **First inspection:** Must be completed within 100 hours of flying time after 14 February 1969\n- **Ongoing inspections:** Must be repeated every 100 hours of flying time thereafter\n\n**Why it matters:** Cracks in this structural tube could lead to landing gear failure or wing structural collapse — potentially causing a crash. This directive ensures potential cracks are caught before they become dangerous.\n\n**Key terms explained:**\n- **Time in service:** Actual flying hours (not calendar time)\n- **Stub wing:** A short wing section that connects the main wing to the fuselage and often carries the landing gear\n- **Airworthiness Directive:** A legally binding safety instruction that must be followed to keep an aircraft certified to fly"}},"importantCases":[],"_links":{"self":"/api/acts/ad-pl-12-4-stub-wing-structure-inspection","history":"/api/acts/ad-pl-12-4-stub-wing-structure-inspection/history","analysis":"/api/acts/ad-pl-12-4-stub-wing-structure-inspection/analysis","conflicts":"/api/acts/ad-pl-12-4-stub-wing-structure-inspection/conflicts","importantCases":"/api/acts/ad-pl-12-4-stub-wing-structure-inspection/important-cases","documents":"/api/acts/ad-pl-12-4-stub-wing-structure-inspection/documents"}}