{"id":"F2006B04778","name":"AD/BN-2/66 Amdt 1 - Nose Wheel - Steering Drive-Ring","slug":"ad-bn-2-66-amdt-1-nose-wheel-steering-drive-ring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44554,"registerId":"commonwealth-F2006B04778-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/66 Amdt 1 - Nose Wheel - Steering Drive-Ring","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n![](image.002.png)  \nPilatus Britten-Norman BN-2 Series Aeroplanes\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/BN-2/66 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAD/BN-2/66\n\nAmdt 1\n\n  \nNose Wheel \\- Steering Drive-Ring 8/2000\n\nApplicability: Model BN2, BN2A, BN2B, and BN2T Islander aircraft.\n\nRequirement: Action in accordance with Britten-Norman Mandatory Service Bulletin BN2/SB.214 Issue 2.\n\nCompliance: Unless the initial inspection is already accomplished, within 100 hours time in service after 10 August 2000; thereafter at intervals not to exceed 100 hours time in service, until a steel drive-ring (part number NB-41-193) is installed.\n\nThis amendment becomes effective on 10 August 2000.\n\nBackground: The manufacturer received reports of cracks in nose wheel steering aluminium drive- rings.\n\nAmendment 1 is issued to correct the Requirement document issue status.\n\nThe original issue of this Airworthiness Directive became effective on 17 June 1999.\n\n![](image.003.png)  \n\nBernard Malcolm Hole\n\nDelegate of the Civil Aviation Safety Authority 29 June 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 12 July 2000.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific safety defect in a specific aircraft component. The amendment makes only a technical correction to the referenced document version, without expanding the applicability, requirements, or compliance obligations beyond the original intent."},"complexity_factors":["Single, specific mechanical issue addressed (cracked nose wheel steering component)","Clear applicability limited to four specific aircraft models","Straightforward compliance timeline (100 hours recurring)","Only one cross-reference (to manufacturer's Service Bulletin BN2/SB.214 Issue 2)","Minimal conditional logic (only exception is if initial inspection already completed)","No defined terms section — uses plain technical language","Short document (approximately 250 words of substantive text)"],"plain_english_summary":"This AD replaces a prior order for Britten‑Norman BN2/BN2A/BN2B/BN2T Islanders, requiring nose‑wheel steering inspections every 100 flight hours due to cracks found in aluminium steering drive‑rings. Operators must continue periodic checks until the aluminium part is replaced with the specified steel part to eliminate steering‑failure risk during ground operations.\n\nThe amendment merely corrects which issue of the manufacturer’s service bulletin to follow."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 corrects the Requirement document issue status; it does not alter applicability, the 100‑hour inspection interval, or the replacement condition (installation of steel drive‑ring P/N NB‑41‑193). The original AD took effect 17 June 1999; this amendment became effective 10 August 2000 and retains the same operational scope."},"complexity_factors":["Narrow technical scope: applies only to Pilatus Britten‑Norman BN‑2 series (BN2, BN2A, BN2B, BN2T).","Recurring operational burden: mandatory inspections at 100‑hour intervals until specified steel part is installed.","Dependence on an external document: Requirement references Britten‑Norman Mandatory Service Bulletin BN2/SB.214 Issue 2 for procedural detail.","Part‑replacement trigger: compliance ends only upon installation of steel drive‑ring (P/N NB‑41‑193), creating supply and cost considerations for operators.","Regulatory provenance: issued under CAR 1998 subreg 39.1(1) by CASA delegate, so enforcement and compliance records are required.","Amendment nature: Amdt 1 corrects the Requirement document issue status rather than changing substantive remedial action, which can create traceability questions between AD and service bulletin versions."],"plain_english_summary":"Requires BN‑2, BN2A, BN2B and BN2T Islander operators to inspect the nose‑wheel steering drive‑ring per Britten‑Norman Mandatory Service Bulletin BN2/SB.214 Issue 2 within 100 hours TIS after 10 August 2000 and then every 100 hours until a steel drive‑ring (P/N NB‑41‑193) is fitted. The directive was issued after reports of cracked aluminium drive‑rings; it prescribes an inspection cadence and replacement condition. Operators pay for inspections and any replacement; CASA enforces compliance under CAR 1998 subreg 39.1(1)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-66-amdt-1-nose-wheel-steering-drive-ring","history":"/api/acts/ad-bn-2-66-amdt-1-nose-wheel-steering-drive-ring/history","analysis":"/api/acts/ad-bn-2-66-amdt-1-nose-wheel-steering-drive-ring/analysis","conflicts":"/api/acts/ad-bn-2-66-amdt-1-nose-wheel-steering-drive-ring/conflicts","importantCases":"/api/acts/ad-bn-2-66-amdt-1-nose-wheel-steering-drive-ring/important-cases","documents":"/api/acts/ad-bn-2-66-amdt-1-nose-wheel-steering-drive-ring/documents"}}