{"id":"F2006B07547","name":"AD/VAT/15 - Flight Instruments - Repositioning of Venturi","slug":"ad-vat-15-flight-instruments-repositioning-of-venturi","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50141,"registerId":"commonwealth-F2006B07547-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/VAT/15 - Flight Instruments - Repositioning of Venturi","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/15 Flight Instruments - Repositioning of Venturi 5/64\n\nApplicability: Victa Airtourer 100 with S/Nos. 1 to 37. Document:  1. Victa SB No. 23; or\n\n2. Victa Mod. B82. Compliance: 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive targeting a specific technical defect in a limited fleet of aircraft. It has not expanded beyond its original purpose of mandating a hardware modification to ensure flight instrument accuracy."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Only 2 defined applicability criteria (aircraft model and serial number range)","Single, unambiguous compliance action (repositioning of one component)","Binary compliance pathway (two alternative documents achieve the same outcome)","Fixed deadline with no conditional extensions or exceptions","No cross-references to other legislation, regulations, or technical standards beyond the two named manufacturer documents","No nested conditions, exceptions, or 'unless' clauses"],"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). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it requires:** Owners or operators of specific **Victa Airtourer 100** aeroplanes (serial numbers 1 to 37) must reposition a component called a **Venturi** — a small tube that helps power flight instruments like the airspeed indicator and altimeter by using airflow. The Venturi needs to be moved to a new location to ensure accurate instrument readings and safe flight.\n\n**Who must comply:** Anyone who owns or operates one of these 37 specific aircraft. The directive applies regardless of whether the aircraft is used for private flying, training, or commercial purposes.\n\n**How to comply:** Follow either:\n- **Victa Service Bulletin No. 23** (official instructions from the manufacturer), OR\n- **Victa Modification B82** (an approved design change)\n\n**Deadline:** The work had to be completed **before 1 September 1971**.\n\n**Why it matters:** Incorrect Venturi positioning can cause flight instruments to give false readings — potentially leading pilots to believe they're flying faster, slower, higher, or lower than they actually are. This creates serious safety risks, especially during takeoff, landing, or in poor weather."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope is confined to Victa Airtourer 100 aircraft with serial numbers 1–37 and requires repositioning the Venturi per the cited manufacturer documents by a specified date. Nothing in the text indicates any widening or narrowing of scope beyond that original requirement."},"complexity_factors":["Very narrow applicability (Victa Airtourer 100, S/N 1–37)","Single, discrete required action (reposition Venturi)","Prescriptive method pointed to external documents (Victa SB No.23 or Mod. B82) rather than including technical detail","Fixed historical compliance date (creates clear deadline but no staged options)","Operational impacts limited to owners/operators of affected aircraft (low regulatory breadth)"],"plain_english_summary":"This directive mandates repositioning the flight‑instrument Venturi on Victa Airtourer 100 aeroplanes serials 1–37, as required by the Civil Aviation Safety Authority. Work must follow Victa Service Bulletin No. 23 or Modification B82 and was required to be completed by 1 September 1971.\n\nAffected owners/operators must schedule and fund the modification and take aircraft out of service until it’s carried out; the AD relies on the manufacturer documents for the technical procedure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-vat-15-flight-instruments-repositioning-of-venturi","history":"/api/acts/ad-vat-15-flight-instruments-repositioning-of-venturi/history","analysis":"/api/acts/ad-vat-15-flight-instruments-repositioning-of-venturi/analysis","conflicts":"/api/acts/ad-vat-15-flight-instruments-repositioning-of-venturi/conflicts","importantCases":"/api/acts/ad-vat-15-flight-instruments-repositioning-of-venturi/important-cases","documents":"/api/acts/ad-vat-15-flight-instruments-repositioning-of-venturi/documents"}}