{"id":"F2006B04761","name":"AD/BN-2/5 - Rudder Control System - Modification","slug":"ad-bn-2-5-rudder-control-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44525,"registerId":"commonwealth-F2006B04761-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/5 - Rudder Control System - 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-2/5 Rudder Control System - Modification NK\n\nApplicability: All models.\n\n \n\nDocument:  Britten-Norman Modification No. BN-2/NB/M/294. Compliance: Before 1 April 1969.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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 AD text contains a single, clear requirement: apply Britten-Norman Modification No. BN-2/NB/M/294 to the rudder control system on all BN-2 models by 1 April 1969. There is no indication in the supplied text that the applicability, technical scope, or deadline has been altered from the directive as presented. The scope is limited to that modification for all models and a fixed compliance date (see “Applicability: All models”, “Document: BN-2/NB/M/294”, “Compliance: Before 1 April 1969”)."},"complexity_factors":["Single, discrete requirement (modify rudder control system) reduces structural complexity.","Universal applicability to all BN-2 models simplifies application but increases operational scope.","Reference to an external technical document (BN-2/NB/M/294) shifts technical detail outside the AD, requiring users to obtain and interpret another document.","Fixed compliance deadline (before 1 April 1969) creates a binary compliance test rather than phased or conditional obligations.","No procedural detail, exemptions, or alternative compliance paths are included in the AD text, so implementation depends on the external document and existing maintenance/approval processes."],"plain_english_summary":"This airworthiness directive, issued under Australia’s Civil Aviation Regulations Part 39, requires all Pilatus Britten‑Norman BN‑2 series aeroplanes to receive the rudder‑control modification specified in Britten‑Norman Modification No. BN‑2/NB/M/294. Operators, owners and maintenance organisations must complete the work by 1 April 1969; the AD contains no technical detail, cost allocation, or alternative compliance routes, so parties must obtain the referenced modification and arrange and fund its implementation."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on rudder control system modification. It has not expanded beyond its original narrow technical scope. The document appears complete as issued, though it references an external technical modification document for implementation details."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — relies entirely on external technical document (Britten-Norman Modification No. BN-2/NB/M/294)","No conditional logic or exceptions — simple blanket applicability to 'All models'","Single compliance requirement with fixed date — no alternative methods of compliance (AMOCs) stated in this excerpt","No cross-references to other legislation beyond generic 'Civil Aviation Regulations 1998, PART 39' header"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for **Pilatus Britten-Norman BN-2 series aeroplanes** (commonly known as Islander aircraft).\n\n**What it does:**\n- Requires owners/operators to modify the **rudder control system** on these aircraft\n- The specific fix is detailed in **Britten-Norman Modification No. BN-2/NB/M/294**\n\n**Who it affects:**\n- All models of the BN-2 series aircraft\n- Aircraft owners, operators, and maintenance organisations\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety requirements. Non-compliance means an aircraft cannot legally fly.\n- This particular directive had a **hard deadline of 1 April 1969**, meaning all affected aircraft needed the modification completed by that date to remain airworthy.\n\n**Key point:** This is a historical directive from the late 1960s. The \"NK\" notation typically indicates the directive is no longer active (superseded or cancelled), though the exact status would require checking CASA's current AD register."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-5-rudder-control-system-modification","history":"/api/acts/ad-bn-2-5-rudder-control-system-modification/history","analysis":"/api/acts/ad-bn-2-5-rudder-control-system-modification/analysis","conflicts":"/api/acts/ad-bn-2-5-rudder-control-system-modification/conflicts","importantCases":"/api/acts/ad-bn-2-5-rudder-control-system-modification/important-cases","documents":"/api/acts/ad-bn-2-5-rudder-control-system-modification/documents"}}