{"id":"F2006B04745","name":"AD/BN-2/33 Amdt 1 - Rudder Hinge Mounting - Inspection and Modification","slug":"ad-bn-2-33-amdt-1-rudder-hinge-mounting-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44509,"registerId":"commonwealth-F2006B04745-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/33 Amdt 1 - Rudder Hinge Mounting - Inspection and 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-2/33\n\nAmdt 1\n\nApplicability: All models.\n\n\nRudder Hinge Mounting - Inspection and Modification\n\n\n1/75\n\n \n\nDocument: Britten Norman SB No. BN-2/SB.76 Issue 3. Compliance:  As per requirement document.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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 standard Airworthiness Directive format consistent with CASA's long-standing regulatory framework for aviation safety. It maintains the traditional scope of ADs: mandating specific safety actions for particular aircraft types based on manufacturer service bulletins. The amendment (Amdt 1) appears to be a routine update to reference the current issue of the service bulletin (Issue 3) rather than an expansion of scope."},"complexity_factors":["Extremely short document (approximately 150 words)","Only one substantive requirement: comply with referenced service bulletin","No defined terms section","No conditional logic or nested exceptions","Single cross-reference to external technical document (manufacturer's service bulletin)","No procedural steps detailed within the legislation itself — all technical detail outsourced to manufacturer document"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all models of **Pilatus Britten-Norman BN-2 series aeroplanes** (commonly known as Islander aircraft).\n\n**What it does:**\n- Requires owners and operators of these aircraft to inspect and potentially modify the **rudder hinge mounting** — the hardware that attaches the rudder (the vertical moving part on the tail that steers the plane left and right) to the aircraft structure.\n\n**Why it matters:**\n- Rudder hinge mountings are critical for flight safety. If they fail, the pilot could lose directional control of the aircraft. This AD ensures any defects are found and fixed before they become dangerous.\n\n**How to comply:**\n- Operators must follow the instructions in **Britten-Norman Service Bulletin No. BN-2/SB.76 Issue 3** — a technical document from the aircraft manufacturer detailing exactly what inspections to perform and what modifications are needed.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains a Pilatus Britten-Norman BN-2 aircraft in Australia."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This entry is labelled as Amendment 1 to AD/BN-2/33 (Amdt 1), indicating it modifies an earlier AD. The amended text, as presented, applies the AD to all BN-2 models and makes compliance mandatory by reference to Britten Norman Service Bulletin No. BN-2/SB.76 Issue 3 (source: AD title 'Amdt 1', 'Applicability: All models', and 'Document: Britten Norman SB No. BN-2/SB.76 Issue 3. Compliance: As per requirement document.')."},"complexity_factors":["Delegation of technical detail to an external service bulletin (Britten Norman SB No. BN-2/SB.76 Issue 3) rather than inclusion in the AD itself (source: \"Document: ... BN-2/SB.76 Issue 3. Compliance: As per requirement document.\")","Mandatory legal effect under Civil Aviation Regulations 1998, Part 39, creating an enforceable compliance obligation (source: header referencing Part 39 and schedule of ADs)","Technical nature of required work (inspection and modification of rudder hinge mounting) which typically requires certified maintenance organisations and parts","Applicability to all BN-2 models increases scope of compliance planning across fleet operators (source: \"Applicability: All models\")","Potential operational impacts (aircraft downtime, maintenance scheduling, parts procurement) though the AD does not quantify timing or cost","Possible need for CASA approval of alternative compliance methods if operators cannot follow the bulletin precisely (implied by AD structure referencing an external requirement document)"],"plain_english_summary":"This AD requires all Pilatus Britten‑Norman BN‑2 aircraft to have the rudder hinge mounting inspected and modified as mandated by Britten Norman Service Bulletin BN‑2/SB.76 Issue 3. Compliance is mandatory under CASA’s Part 39 authority; owners/operators must obtain the SB, carry out and pay for the work, and follow CASA’s AD processes for any alternatives."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-33-amdt-1-rudder-hinge-mounting-inspection-and-modification","history":"/api/acts/ad-bn-2-33-amdt-1-rudder-hinge-mounting-inspection-and-modification/history","analysis":"/api/acts/ad-bn-2-33-amdt-1-rudder-hinge-mounting-inspection-and-modification/analysis","conflicts":"/api/acts/ad-bn-2-33-amdt-1-rudder-hinge-mounting-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-bn-2-33-amdt-1-rudder-hinge-mounting-inspection-and-modification/important-cases","documents":"/api/acts/ad-bn-2-33-amdt-1-rudder-hinge-mounting-inspection-and-modification/documents"}}