{"id":"F2006B09957","name":"AD/FN-333/4 - Front Seat Restraint Installations - Modification","slug":"ad-fn-333-4-front-seat-restraint-installations-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55221,"registerId":"commonwealth-F2006B09957-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/FN-333/4 - Front Seat Restraint Installations - 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)  SIAI Marchetti FN-333 (Riviera) Series Aeroplanes\n\n \n\nAD/FN-333/4 Front Seat Restraint Installations - Modification NK\n\nApplicability: All models.\n\n \n\nRequirement: Modify each front seat restraint installation by fitting a safety harness in accordance with a sche me approved by the Secretary.\n\n \n\nNote: Guidelines for installation schemes are outlined in Airworthiness Advisory circular No. 62 dated March 1972.\n\nCompliance: Before 1 January 1974.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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 focused specifically on front seat restraints for one aircraft type. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 1 substantive requirement with clear action (fit safety harness)","Single defined term implicitly ('Secretary' — standard government reference)","No cross-references to other legislation sections","No conditional logic or exceptions","Simple, direct command structure: Applicability → Requirement → Compliance date"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:** It requires owners or operators of **SIAI Marchetti FN-333 (Riviera) series aeroplanes** to modify the front seat restraints (seatbelts/harnesses) by installing an approved safety harness.\n\n**Who it affects:** Anyone who owns, operates, or maintains these specific Italian-made light aircraft.\n\n**What must be done:** The front seat restraint system must be upgraded to include a safety harness, following a scheme (plan) that has been approved by the Secretary (of the Department responsible for aviation at the time).\n\n**When it had to be done:** Before **1 January 1974** — meaning this directive is long past its compliance date and is now of historical interest only.\n\n**Why it matters:** This was a safety measure to better protect pilots and front-seat passengers during accidents. The reference to a 1972 advisory circular suggests this was part of broader improvements to aviation safety standards for occupant protection."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided text does not include information indicating a change in scope from an earlier or original instrument. The directive as given applies to all models of the SIAI Marchetti FN-333 (Riviera) series and requires fitting a safety harness per a scheme approved by the Secretary, with guidance referenced to Airworthiness Advisory Circular No. 62 and a compliance date of 1 January 1974."},"complexity_factors":["Mandatory physical retrofit for each front seat restraint (explicit technical work required).","Requirement that installations conform to a scheme approved by the Secretary (administrative approval step increases complexity).","Reference to an external guidance document (Airworthiness Advisory Circular No. 62) rather than embedding technical standards in the directive.","Fixed compliance deadline (operational scheduling and potential grounding of aircraft until work is completed).","Applicability to all models of the type (broad coverage increases the number of affected operators and variation in individual aircraft conditions)."],"plain_english_summary":"The instrument mandates that every front-seat restraint on all SIAI Marchetti FN-333 (Riviera) aeroplanes be modified by fitting a safety harness according to an installation scheme approved by the Secretary. Compliance (owners/operators pay) is required before 1 January 1974, with Airworthiness Advisory Circular No. 62 (March 1972) cited for guidance.\n\nIt matters because operators must ground aircraft for retrofit, absorb costs and seek Secretary approval, concentrating technical conformity through that approval process."}},"importantCases":[],"_links":{"self":"/api/acts/ad-fn-333-4-front-seat-restraint-installations-modification","history":"/api/acts/ad-fn-333-4-front-seat-restraint-installations-modification/history","analysis":"/api/acts/ad-fn-333-4-front-seat-restraint-installations-modification/analysis","conflicts":"/api/acts/ad-fn-333-4-front-seat-restraint-installations-modification/conflicts","importantCases":"/api/acts/ad-fn-333-4-front-seat-restraint-installations-modification/important-cases","documents":"/api/acts/ad-fn-333-4-front-seat-restraint-installations-modification/documents"}}