{"id":"F2006B07551","name":"AD/VAT/19A - Exhaust Muffler Baffle - Inspection","slug":"ad-vat-19a-exhaust-muffler-baffle-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50145,"registerId":"commonwealth-F2006B07551-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/VAT/19A - Exhaust Muffler Baffle - 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/19A Exhaust Muffler Baffle - Inspection 6/68\n\nApplicability: Airtourer 115. Document:  Victa Alert SB No. A.35.\n\nCompliance: 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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text sets a single, narrow requirement: inspect the exhaust muffler baffle on Airtourer 115 aircraft at intervals not exceeding 100 hours time in service, after 1 September 1971, and references Victa Alert SB No. A.35. The document contains no information indicating a change in scope from an earlier or original instrument. Based only on the supplied text, there is no evidentiary basis to conclude the scope has changed."},"complexity_factors":["Narrow technical scope: applies to a single aircraft type (Airtourer 115) (Applicability).","Single, explicit compliance requirement: fixed inspection interval of 100 hours TIS (Compliance).","References an external service bulletin for technical detail (Document: Victa Alert SB No. A.35), which requires access to that bulletin but does not add internal procedural complexity.","No exceptions, alternative compliance pathways, or enforcement procedures specified in the supplied text.","Historical dating (requirement commencing after 1 September 1971) but no ongoing amendment or variant language in the supplied text."],"plain_english_summary":"### What this instrument does, in plain terms\n\nThis airworthiness directive (AD/VAT/19A) requires owners/operators of Victa/A.E.S.L. Airtourer 115 aeroplanes to inspect the exhaust muffler baffle on a fixed schedule. The directive names Victa Alert Service Bulletin No. A.35 as the related document and sets the inspection interval to no more than 100 hours of time in service, with that requirement starting after 1 September 1971. (See: \"Applicability\", \"Document\", \"Compliance\").\n\n### Who it affects\n\n- Aircraft owners and operators of the Airtourer 115 (Applicability).\n- Maintenance organisations and mechanics who perform the inspection and any follow-up work (Document reference: Victa Alert SB No. A.35).\n\n### How it works mechanically\n\n- The directive is prescriptive: it sets a maximum interval between inspections (100 hours time in service) and identifies the affected aeroplane type and the service bulletin that contains technical detail (Applicability; Document; Compliance).\n- Owners/operators must schedule and carry out inspections at or before each 100-hour threshold after 1 September 1971.\n\n### Purpose as stated or implied\n\n- The title and placement in the Schedule of Airworthiness Directives indicate the measure is intended to manage a safety or airworthiness risk related to the exhaust muffler baffle (AD title and placement). That is an express purpose-claim in the source text (the AD title: \"Exhaust Muffler Baffle - Inspection\").\n\n### Practical effects, costs and incentives\n\n- Who pays: the aircraft owner/operator bears the direct costs of inspections and any corrective work (Compliance requirement). These costs include labour, parts if needed, and potential aircraft downtime while the inspection or repairs are carried out.\n- Who decides: the Civil Aviation Safety Authority issued the AD as part of the Schedule of Airworthiness Directives; affected parties must follow the AD (AD heading and placement).\n- Compliance burden: adherence requires record-keeping of time in service and scheduling maintenance at 100-hour intervals. The requirement is rule-based rather than discretionary (Compliance).\n- Market effects: maintenance providers who service these aircraft may receive more work from required inspections and any resulting repairs; owners may choose between performing inspections themselves (if qualified) or contracting out.\n\n### Trade-offs, implementation risks and discretion\n\n- Trade-offs: the directive imposes recurring inspection costs and operational scheduling constraints in exchange for the intended mitigation of whatever risk prompted the AD (title and prescription). The directive does not disclose the specific incident or failure rate that triggered it; the source text provides only the inspection mandate (AD text).\n- Implementation risk: the AD requires only the inspection interval and references a service bulletin for technical detail (Document: Victa Alert SB No. A.35). If the bulletin is unavailable or unclear, operators may face practical difficulty complying exactly with the AD.\n- Bureaucratic discretion: the AD itself is prescriptive and leaves little discretion to operators about whether to inspect; it does not, in the supplied text, set out exemptions, alternative actions, or an approval pathway for different intervals or methods.\n\n### Concentrated vs diffuse impacts\n\n- Concentrated benefits: maintenance providers and suppliers of parts for the exhaust system are likely to see relatively concentrated increases in demand tied to compliance.\n- Diffuse costs: the cost of inspections is distributed across owners/operators of the affected model, who individually bear small-to-moderate recurring costs (Compliance).\n\n(Primary source lines: AD title and identifier AD/VAT/19A; Applicability: \"Airtourer 115\"; Document: \"Victa Alert SB No. A.35\"; Compliance: \"At intervals not exceeding 100 hours time in service, after 1 September 1971.\")"},"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 of a single aircraft type. It has not expanded beyond its original purpose of ensuring exhaust system integrity through periodic inspection."},"complexity_factors":["Extremely short document — approximately 100 words of substantive content","Only one operative requirement (inspection interval)","Single applicability criterion (one specific aircraft model)","No defined terms section, no cross-references to other legislation beyond the enabling regulations","No conditional logic, exceptions, or nested provisions","Simple temporal trigger (date-based commencement) and recurring interval (hours-based)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific light aircraft (the **Victa and A.E.S.L. Airtourer 115** series) to **inspect the exhaust muffler baffle** — a component that helps reduce engine noise and direct exhaust gases — at regular intervals.\n\n**Who it affects:** Anyone who owns, operates, or maintains an Airtourer 115 aircraft.\n\n**The requirement:** The exhaust muffler baffle must be inspected **every 100 hours of flight time** (\"time in service\"), starting from **1 September 1971**.\n\n**Why it matters:** Exhaust system failures can cause carbon monoxide leaks into the cabin (which can poison pilots and passengers) or engine damage. This directive ensures a potentially faulty part is checked regularly to prevent accidents.\n\n**Key details:**\n- **Document reference:** Victa Alert Service Bulletin No. A.35 (the manufacturer's official safety notice)\n- **Compliance deadline:** Ongoing — every 100 hours of operation after the 1971 date\n- **Legal force:** Non-compliance is an offence under aviation law and the aircraft cannot be legally flown"}},"importantCases":[],"_links":{"self":"/api/acts/ad-vat-19a-exhaust-muffler-baffle-inspection","history":"/api/acts/ad-vat-19a-exhaust-muffler-baffle-inspection/history","analysis":"/api/acts/ad-vat-19a-exhaust-muffler-baffle-inspection/analysis","conflicts":"/api/acts/ad-vat-19a-exhaust-muffler-baffle-inspection/conflicts","importantCases":"/api/acts/ad-vat-19a-exhaust-muffler-baffle-inspection/important-cases","documents":"/api/acts/ad-vat-19a-exhaust-muffler-baffle-inspection/documents"}}