{"id":"F2006B04792","name":"AD/BN-2/79 - FHL Landing Gear Units","slug":"ad-bn-2-79-fhl-landing-gear-units","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44576,"registerId":"commonwealth-F2006B04792-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 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\n![](image.001.png)  \n\nPilatus Britten-Norman BN-2 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BN-2/79 FHL Landing Gear Units 10/200","sectionType":"part","heading":"AD/BN-2/79 FHL Landing Gear Units 10/2003 DM","content":"# AD/BN-2/79 FHL Landing Gear Units 10/2003 DM\n\nApplicability: All BN2, BN2A, BN2B, BN2T, BN2T-4R, and BN2T-4S series Islander aircraft fitted with FHL Landing Gear.\n\nRequirement: Action in accordance with B-N Group Limited Service Bulletin SB 298.\n\nCompliance: As specified in the Requirement document, with a Requirement document effective date of 20 August 2003.\n\nThis Airworthiness Directive becomes effective on 13 August 2003.\n\nBackground: The UK CAA and FHL have determined that there is no method or procedure for recording the fatigue lives on FHL landing gear. This Directive introduces fatigue lives to landing gear and landing gear components.\n\n![](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 7 August 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 13 August 2003.","sortOrder":1}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe condition in a specific landing gear type on specific aircraft models. It does not expand beyond the original safety purpose of introducing fatigue life tracking for FHL landing gear units."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (aircraft model + landing gear type)","Single requirement referencing an external document (Service Bulletin 298)","No nested exceptions or conditional logic","No cross-references to other legislation beyond basic CASR enabling power","Straightforward compliance structure (follow the service bulletin)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of certain Pilatus Britten‑Norman Islander models fitted with FHL landing gear to comply with Service Bulletin SB 298, introducing mandatory fatigue life limits (use‑by hours/cycles) for those gear and components. CASA issued it because no tracking system existed for accumulated stress, creating a metal‑fatigue safety risk; compliance by the effective dates is mandatory to keep aircraft airworthy (effective 13 Aug 2003)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD implements the stated intention to introduce fatigue lives for FHL landing gear and components. The text shows no alteration of that scope from the stated background rationale; it simply makes compliance with SB 298 mandatory (Background, Requirement)."},"complexity_factors":["Narrow applicability across multiple BN‑2 variants means the rule targets a limited fleet but different submodels (Applicability).","Mandates compliance with an external technical document (B‑N Group Service Bulletin SB 298), so the AD’s requirements depend on that bulletin’s content and clarity (Requirement).","Technical subject matter: establishing and recording fatigue lives requires engineering assessments, inspections and lifecycle tracking (Background).","Timing/implementation quirk: the AD becomes effective 13 Aug 2003 while the Requirement document has an effective date of 20 Aug 2003, creating an implementation sequencing risk (Compliance).","Compliance burden falls on operators: inspections, recordkeeping, possible part replacement and associated downtime and costs (Requirement, Compliance).","Regulatory discretion is limited to the CASA delegate’s issuance; enforcement and acceptable compliance are tied to the bulletin rather than new prescriptive rules (covering text and signature).","Cross‑jurisdictional source: the change follows UK CAA and FHL determinations, so technical rationale and parts data originate outside CASA (Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of Pilatus Britten‑Norman BN‑2 Islander aircraft fitted with FHL landing gear to follow B‑N Group Service Bulletin SB 298, which introduces and records fatigue lives for landing gear and components. CASA’s delegate made compliance mandatory as specified in the bulletin; the AD took effect 13 August 2003 (Requirement, Compliance, Applicability, Background). Operators must inspect, track and, where directed, replace gear parts, and will bear the inspection, recordkeeping and replacement costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-79-fhl-landing-gear-units","history":"/api/acts/ad-bn-2-79-fhl-landing-gear-units/history","analysis":"/api/acts/ad-bn-2-79-fhl-landing-gear-units/analysis","conflicts":"/api/acts/ad-bn-2-79-fhl-landing-gear-units/conflicts","importantCases":"/api/acts/ad-bn-2-79-fhl-landing-gear-units/important-cases","documents":"/api/acts/ad-bn-2-79-fhl-landing-gear-units/documents"}}