{"id":"F2006B07580","name":"AD/VAT/6 - Elevator and Rudder Bellcrank Bearing Retention - Modification","slug":"ad-vat-6-elevator-and-rudder-bellcrank-bearing-retention-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50204,"registerId":"commonwealth-F2006B07580-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/VAT/6 - Elevator and Rudder Bellcrank Bearing Retention - 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/6 Elevator and Rudder Bellcrank Bearing\n\nRetention - Modification\n\nApplicability: Victa Airtourer 100 and 115 with S/Nos. 1 to 14. Document:  Victa SB No. 9.\n\nCompliance: Before 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\n\n5/63\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 focused on a specific mechanical modification for a limited fleet of aircraft. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","No defined terms section — uses plain technical aviation terminology","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Simple conditional structure: single applicability criterion (specific aircraft models and serial numbers)","Single compliance action with clear deadline","No exceptions, exemptions, or nested conditions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific modifications to certain small aircraft to keep them safe to fly.\n\n**What it does:**\n- Orders owners/operators of **Victa Airtourer 100 and 115 aircraft** (serial numbers 1 to 14) to modify the **elevator and rudder bellcrank bearing retention** systems.\n- A \"bellcrank\" is a pivoting lever that transfers movement from the pilot's controls to the aircraft's control surfaces (the elevator moves the plane up/down; the rudder steers left/right). The \"bearing retention\" refers to how the pivot points are held in place — if these fail, the pilot could lose control of the aircraft.\n\n**Who it affects:**\n- Owners and operators of the specific Victa Airtourer models listed (early production aircraft, serial numbers 1–14).\n\n**Why it matters:**\n- This addresses a potential mechanical failure that could cause the pilot to lose control of the aircraft's pitch (up/down) or yaw (left/right steering), with potentially catastrophic consequences.\n- Compliance was required before **1 September 1971** — meaning this is a historical directive for vintage aircraft still in operation or restoration.\n\n**Key details:**\n- **Compliance deadline:** Before 1 September 1971 (now long past, but relevant for ongoing airworthiness of surviving aircraft).\n- **Reference document:** Victa Service Bulletin No. 9 (the manufacturer's official repair instruction)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text gives a single, specific requirement: perform the elevator and rudder bellcrank bearing-retention modification on Victa Airtourer 100 and 115 aircraft S/Ns 1–14 in accordance with Victa SB No. 9 before 1 September 1971. There is no indication in the provided text that the scope has been altered from its original formulation."},"complexity_factors":["Very narrow applicability (only Victa Airtourer 100 and 115, S/Ns 1–14). (Applicability)","Single mandated technical action (modification to bearing retention). (Title)","Clear external technical reference required (Victa SB No. 9), which concentrates technical detail outside the directive. (Document: Victa SB No. 9)","Fixed compliance deadline creates a simple temporal requirement. (Compliance)","Limited regulatory text provided — no multiple compliance options, exemptions, or procedural layers specified."],"plain_english_summary":"Owners and operators of Victa Airtourer models 100 and 115 (serials 1–14) must modify the elevator and rudder bellcrank bearing retention in accordance with Victa Service Bulletin No. 9. The mandated one‑off modification must be completed before 1 September 1971, with compliance costs, downtime and technical execution falling to the aircraft owners/operators and qualified maintenance providers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-vat-6-elevator-and-rudder-bellcrank-bearing-retention-modification","history":"/api/acts/ad-vat-6-elevator-and-rudder-bellcrank-bearing-retention-modification/history","analysis":"/api/acts/ad-vat-6-elevator-and-rudder-bellcrank-bearing-retention-modification/analysis","conflicts":"/api/acts/ad-vat-6-elevator-and-rudder-bellcrank-bearing-retention-modification/conflicts","importantCases":"/api/acts/ad-vat-6-elevator-and-rudder-bellcrank-bearing-retention-modification/important-cases","documents":"/api/acts/ad-vat-6-elevator-and-rudder-bellcrank-bearing-retention-modification/documents"}}