{"id":"F2006B09956","name":"AD/FN-333/3 - Inlet Manifold Rear Drain - Modification","slug":"ad-fn-333-3-inlet-manifold-rear-drain-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55220,"registerId":"commonwealth-F2006B09956-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/FN-333/3 - Inlet Manifold Rear Drain - 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-333/3 Inlet Manifold Rear Drain - Modification NK\n\nApplicability: All models.\n\n \n\nRequirement: Fit an outside drain line to the inlet manifold rear drain valve similar to those fitted to the forward manifold drains. Ensure that this drain line will drain excess fuel clear of the exhaust system.\n\n \n\nCompliance: Forthwith.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1824},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive retains its original narrow scope — a specific safety modification for one aircraft series. There is no evidence of scope expansion beyond the original fire-prevention purpose."},"complexity_factors":["Single, unambiguous operative requirement","No defined terms or interpretation section","No cross-references to other legislative provisions","No exceptions or conditional logic"],"plain_english_summary":"**What this is:** A mandatory safety fix for the SIAI Marchetti FN-333 Riviera series aircraft. It is an Airworthiness Directive (AD) — a legally binding order issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\n**What it requires:** Owners or operators must immediately install an external drain line on the rear drain valve of the inlet manifold (the engine component mixing air and fuel). This pipe must carry any leaking fuel clear of the exhaust system.\n\n**Why it matters:** Without this modification, excess fuel could drip onto the hot exhaust, creating a serious fire hazard. The forward manifold already has this protection; this directive extends it to the rear.\n\n**Who must comply:** Anyone operating any model of the FN-333 Riviera must complete this modification immediately (the directive uses the term \"forthwith\")."}},"importantCases":[],"_links":{"self":"/api/acts/ad-fn-333-3-inlet-manifold-rear-drain-modification","history":"/api/acts/ad-fn-333-3-inlet-manifold-rear-drain-modification/history","analysis":"/api/acts/ad-fn-333-3-inlet-manifold-rear-drain-modification/analysis","conflicts":"/api/acts/ad-fn-333-3-inlet-manifold-rear-drain-modification/conflicts","importantCases":"/api/acts/ad-fn-333-3-inlet-manifold-rear-drain-modification/important-cases","documents":"/api/acts/ad-fn-333-3-inlet-manifold-rear-drain-modification/documents"}}