{"id":"F2006B07575","name":"AD/VAT/40 - Elevator Centre Rib Structure - Modification","slug":"ad-vat-40-elevator-centre-rib-structure-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50186,"registerId":"commonwealth-F2006B07575-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/VAT/40 - Elevator Centre Rib Structure - 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)  Victa and A.E.S.L. Airtourer Series Aeroplanes\n\n \n\nAD/VAT/40 Elevator Centre Rib Structure - Modification 10/75\n\nApplicability: All models.\n\n \n\nDocument: Aerospace Airtourer SB No. 038.\n\n \n\nCompliance: Within 100 hours time in service after 31 October 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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1975 addressing a specific structural modification. It has not expanded beyond its original purpose of mandating a safety modification to the elevator structure of Airtourer aircraft."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1988","Single, clear compliance requirement with specific deadline","No conditional logic or exceptions","Simple structure: applicability, reference document, compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1988.\n\n**What it does:**\nIt requires owners and operators of **Victa and A.E.S.L. Airtourer series aeroplanes** to modify the **elevator centre rib structure** (a structural component in the tail section that helps control the aircraft's pitch).\n\n**Who it affects:**\nAnyone who owns or operates any model of Victa or A.E.S.L. Airtourer aircraft.\n\n**What must be done:**\nOperators must follow the instructions in **Aerospace Airtourer Service Bulletin No. 038** (a technical document issued by the manufacturer or design authority detailing the required modification).\n\n**When it must be done:**\nWithin **100 hours of flight time** after **31 October 1975**.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety requirements. If you don't comply, your aircraft is not considered airworthy — meaning you cannot legally fly it. This particular AD addresses a structural issue with the elevator that, if left unaddressed, could potentially compromise flight safety."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text supplied contains a single, self-contained requirement: all Victa and A.E.S.L. Airtourer series aeroplanes must have the elevator centre rib structure modification performed in accordance with Aerospace Airtourer SB No. 038 within 100 hours time in service after 31 October 1975. There is no indication in this instrument that the scope (who or what is covered) has been altered from any prior or original intent within the text provided."},"complexity_factors":["Brevity of the AD text: the directive is short and prescriptive, reducing interpretive complexity.","Reliance on an external technical document (Aerospace Airtourer SB No. 038) for implementation details increases practical complexity because the AD delegates technical specifics.","Universal applicability to \"All models\" narrows applicability questions but increases the pool of affected operators and logistical complexity.","A fixed compliance window (100 hours TIS after a calendar date) creates scheduling and operational constraints for operators.","Lack of cost, procedural, or alternative-method detail in the AD itself requires consultees to consult the Service Bulletin and possibly regulatory guidance, adding administrative steps."],"plain_english_summary":"This Airworthiness Directive requires owners and operators of all Victa and A.E.S.L. Airtourer series aeroplanes to carry out the elevator centre rib structural modification specified in Aerospace Airtourer Service Bulletin No. 038, within 100 hours time‑in‑service after 31 October 1975. Maintenance organisations must perform the work per the service bulletin; operators bear the cost and downtime. The AD creates a legal compliance obligation enforced by the Civil Aviation Safety Authority."}},"importantCases":[],"_links":{"self":"/api/acts/ad-vat-40-elevator-centre-rib-structure-modification","history":"/api/acts/ad-vat-40-elevator-centre-rib-structure-modification/history","analysis":"/api/acts/ad-vat-40-elevator-centre-rib-structure-modification/analysis","conflicts":"/api/acts/ad-vat-40-elevator-centre-rib-structure-modification/conflicts","importantCases":"/api/acts/ad-vat-40-elevator-centre-rib-structure-modification/important-cases","documents":"/api/acts/ad-vat-40-elevator-centre-rib-structure-modification/documents"}}