{"id":"F2006B04732","name":"AD/BN-2/21 Amdt 1 - Elevator Trim Lever Box Cracking and Loose Rivets","slug":"ad-bn-2-21-amdt-1-elevator-trim-lever-box-cracking-and-loose-rivets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44496,"registerId":"commonwealth-F2006B04732-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/21 Amdt 1 - Elevator Trim Lever Box Cracking and Loose Rivets","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-2/21\n\nAmdt 1\n\n\nElevator Trim Lever Box Cracking and Loose Rivets 9/86\n\n \n\nApplicability: All models.\n\n \n\nRequirement: Inspect the elevator trim lever box in accordance with Chart 1, Chapter 3.2 of Islander Maintenance Manual MM/1 Rev. 27.\n\n \n\nCompliance: Prior to the issue of the next Maintenance Release after 30 September 1986 and thereafter at each issue of a new Maintenance Release.\n\n \n\nBackground: This amendment reflects the change in the Requirement Document caused by Service Bulletin BN-2/S.B. 155 Issue 3. The S.B. cancelled BN-2/S.B. 46 and incorporated the inspection into the referenced 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1483},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The amendment updates the reference documentation (switching from Service Bulletin BN-2/S.B. 46 to the Islander Maintenance Manual following the issuance of Service Bulletin BN-2/S.B. 155 Issue 3), but does not expand or alter the substantive inspection requirement or the affected aircraft population."},"complexity_factors":["Single, discrete mechanical inspection required","Only one external document reference (specific chart in maintenance manual)","Clear applicability (all models of one aircraft series)","Simple compliance trigger (at each Maintenance Release)"],"plain_english_summary":"This rule mandates inspections of the Pilatus Britten‑Norman BN‑2 Islander elevator trim lever box to detect cracks and loose rivets that could cause loss of control. It applies to all owners, operators, and maintenance providers: inspect per Chart 1, Chapter 3.2 of the Islander Maintenance Manual (MM/1 Rev.27) before the next Maintenance Release after 30 Sep 1986 and at every subsequent Maintenance Release. The update simply replaces the Service Bulletin reference with the Maintenance Manual."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-21-amdt-1-elevator-trim-lever-box-cracking-and-loose-rivets","history":"/api/acts/ad-bn-2-21-amdt-1-elevator-trim-lever-box-cracking-and-loose-rivets/history","analysis":"/api/acts/ad-bn-2-21-amdt-1-elevator-trim-lever-box-cracking-and-loose-rivets/analysis","conflicts":"/api/acts/ad-bn-2-21-amdt-1-elevator-trim-lever-box-cracking-and-loose-rivets/conflicts","importantCases":"/api/acts/ad-bn-2-21-amdt-1-elevator-trim-lever-box-cracking-and-loose-rivets/important-cases","documents":"/api/acts/ad-bn-2-21-amdt-1-elevator-trim-lever-box-cracking-and-loose-rivets/documents"}}