{"id":"F2006B04731","name":"AD/BN-2/2 - Fuel Tank Sump - Modification","slug":"ad-bn-2-2-fuel-tank-sump-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44495,"registerId":"commonwealth-F2006B04731-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/2 - Fuel Tank Sump - 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)  Pilatus Britten-Norman BN-2 Series Aeroplanes\n\n \n\nAD/BN-2/2 Fuel Tank Sump - Modification NK\n\nApplicability: All models.\n\n \n\nDocument:  Britten-Norman Modification No. NB/M/350. Compliance: Before 16 May 1968.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":2136},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This remains a narrow, technical safety directive focused solely on the fuel tank sump modification for a specific aircraft type. The scope has not expanded beyond the original safety intent."},"complexity_factors":["Single operative requirement with no subsections or conditional logic","No defined terms or interpretation section","No cross-references to other legislative provisions","References only one external technical document","Total operative text is less than 30 words"],"plain_english_summary":"**What this does**\n\nThis Airworthiness Directive (AD) is a mandatory safety order requiring a specific modification to the fuel tank sump (the lowest part of the fuel tank where water and contaminants collect) on certain aircraft.\n\n**Who it affects**\n\nOwners and operators of **all models** of the Pilatus Britten-Norman BN-2 series aeroplanes (commonly known as the Islander).\n\n**What must be done**\n\nThe aircraft must be modified according to the manufacturer's instructions in **Britten-Norman Modification No. NB/M/350**.\n\n**Deadline**\n\nThe modification had to be completed **before 16 May 1968**.\n\n**Why this matters**\n\nThe directive addresses a design issue with the fuel tank sump to prevent potential fuel contamination or system failures that could affect flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-2-fuel-tank-sump-modification","history":"/api/acts/ad-bn-2-2-fuel-tank-sump-modification/history","analysis":"/api/acts/ad-bn-2-2-fuel-tank-sump-modification/analysis","conflicts":"/api/acts/ad-bn-2-2-fuel-tank-sump-modification/conflicts","importantCases":"/api/acts/ad-bn-2-2-fuel-tank-sump-modification/important-cases","documents":"/api/acts/ad-bn-2-2-fuel-tank-sump-modification/documents"}}