{"id":"F2006B07583","name":"AD/VAT/9 - Aileron Mass Balance Attachment - Inspection","slug":"ad-vat-9-aileron-mass-balance-attachment-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50214,"registerId":"commonwealth-F2006B07583-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/VAT/9 - Aileron Mass Balance Attachment - 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)  Victa and A.E.S.L. Airtourer Series Aeroplanes\n\n \n\nAD/VAT/9 Aileron Mass Balance Attachment - Inspection 11/63\n\nApplicability: Victa Airtourer 100 and 115 with S/Nos. 5 to 49 not incorporating Mods. B75 or B118.\n\n \n\nDocument: Victa SB No. 18.\n\n \n\nCompliance: Inspect at intervals not exceeding 100 hours time in service, after 1 September 1971.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":false,"description":"The source text presents a single, specific requirement and lists its applicability and procedural reference. The text does not indicate any amendment or change in scope from an earlier or original instrument; it simply sets the scope (models, serial numbers, and exclusions) and the inspection interval. No information in the supplied text shows a change to that scope."},"complexity_factors":["Narrow, clear applicability by model, serial number range, and explicit exclusions (Mods B75 and B118) reduces ambiguity (Applicability).","Single recurring action (inspection) at a fixed interval (≤100 hours TIS) keeps operational requirements simple (Compliance).","Technical content is delegated to an external service bulletin (Victa SB No. 18), creating a dependency on that document for procedural detail (Document).","Historical date of commencement (after 1 September 1971) and older aircraft models may increase practical complexity in finding parts, service bulletin copies, or maintenance knowledge (Compliance; Document).","Regulatory authority and mandatory status are established by the AD header, meaning non-compliance has regulatory consequences even though the instrument itself contains limited procedural detail (header)."],"plain_english_summary":"This AD mandates recurring inspections of the aileron mass‑balance attachment on Victa/A.E.S.L. Airtourer 100 and 115 aircraft (S/N 5–49, excluding those with Mods B75 or B118). Inspections, to be done per Victa Service Bulletin No. 18, are required at intervals not exceeding 100 hours TIS from 1 Sept 1971. Owners/operators/maintenance orgs must arrange, pay for and record compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical component on specific aircraft. It has not expanded beyond its original purpose of ensuring aileron mass balance integrity on early Victa Airtourer models."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 operative provisions: applicability, document reference, compliance requirement, and effective date","No defined terms section — all terms are ordinary aviation language or reference external documents","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1988","Simple conditional logic: single applicability test (serial numbers + modification status)","Single compliance action with clear frequency (100 hours) and deadline (post-1 September 1971)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's aviation safety regulator (CASA) requiring specific aircraft owners to conduct regular inspections.\n\n**What it does:**\n- Requires owners of certain **Victa Airtourer 100 and 115 aircraft** (specifically serial numbers 5–49 that haven't had modifications B75 or B118 installed) to inspect the **aileron mass balance attachment** — a component that helps keep the aircraft's control surfaces stable during flight.\n\n**Who it affects:**\n- Owners and operators of the specified Victa Airtourer aircraft models.\n\n**What they must do:**\n- Inspect this attachment **every 100 hours of flight time** (\"time in service\").\n- The requirement took effect from **1 September 1971**.\n\n**Why it matters:**\n- Mass balance attachments prevent dangerous vibrations or flutter in the ailerons (the hinged surfaces on the wings that control roll). If these attachments fail, the aircraft could become uncontrollable. This directive ensures potential cracks or failures are caught before they cause an accident.\n\n**Key reference:**\n- Operators must follow the procedures in **Victa Service Bulletin No. 18**."}},"importantCases":[],"_links":{"self":"/api/acts/ad-vat-9-aileron-mass-balance-attachment-inspection","history":"/api/acts/ad-vat-9-aileron-mass-balance-attachment-inspection/history","analysis":"/api/acts/ad-vat-9-aileron-mass-balance-attachment-inspection/analysis","conflicts":"/api/acts/ad-vat-9-aileron-mass-balance-attachment-inspection/conflicts","importantCases":"/api/acts/ad-vat-9-aileron-mass-balance-attachment-inspection/important-cases","documents":"/api/acts/ad-vat-9-aileron-mass-balance-attachment-inspection/documents"}}