{"id":"F2006B04791","name":"AD/BN-2/78 - Control Rod to Elevator Trim Tab Lever Bolt Retainer","slug":"ad-bn-2-78-control-rod-to-elevator-trim-tab-lever-bolt-retainer","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44575,"registerId":"commonwealth-F2006B04791-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/78 - Control Rod to Elevator Trim Tab Lever Bolt Retainer","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n\nAIRWORTHINESS 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\n\nAD/BN-2/78 Control Rod to Elevator Trim Tab Lever B olt\n\nRetainer\n\n  \n7/2003\n\nDM\n\nApplicability: All BN2, BN2A, BN2B, and BN2T series Islander aircraft.\n\nRequirement: Action in accordance with B-N Group Mandatory Service Bulletin SB 292, dated 1 May 2003.\n\nCompliance: At the next daily check after 4 June 2003, and thereafter at any time the affected control rod is disconnected.\n\nThis Airworthiness Directive becomes effective on 4 June 2003.\n\nBackground: The manufacturer has determined that the retainer NB-03-5229, installed at the connection of the drive rod elevator trim tab lever may have been installed incorrectly, where the retainer is installed under the bolt head and not on the inner face of the drive lever. If the retainer is installed in this way it will not prevent the bolt from disconnecting.\n\n![](image.002.jpeg)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 29 May 2003\n\n![](image.001.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 4 June 2003.\n\n  \n\nPage 1 of 1","sortOrder":0}],"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 is a standard single-issue Airworthiness Directive addressing a specific mechanical defect in a specific aircraft type. The scope remains tightly focused on the elevator trim tab bolt retainer issue as originally identified. No scope creep is evident."},"complexity_factors":["Single, specific aircraft type (BN-2 series) with four sub-models listed","One clear requirement referencing an external technical document (Service Bulletin SB 292)","Simple two-part compliance trigger: next daily check after effective date, plus ongoing trigger for future disconnections","No defined terms section, no cross-references to other legislation beyond the enabling regulation (CASR 1998, subreg 39.1(1))","Background explanation is straightforward mechanical issue with clear safety rationale","Total length: approximately 250 words of substantive text"],"plain_english_summary":"This safety order requires owners and operators of Pilatus Britten-Norman BN-2 Islander aircraft to inspect and, if necessary, correct the installation of a small retainer in the elevator trim tab control per Mandatory Service Bulletin SB 292 (1 May 2003). The retainer may be fitted incorrectly, risking bolt separation and loss of elevator trim; inspections must be done at the next daily check after 4 June 2003 and whenever the control rod is disconnected."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains confined to correcting possible incorrect installation of retainer NB‑03‑5229 on BN‑2 series Islanders. The AD applies to all BN2 variants and requires the specific manufacturer service bulletin (SB 292) to be followed at the stated inspection times; there is no textual indication the AD broadens or departs from that original corrective purpose (Applicability, Requirement, Compliance, Background)."},"complexity_factors":["Narrow technical focus: single component (retainer NB-03-5229) at a specific connection point (Background).","Clear applicability: all BN2, BN2A, BN2B and BN2T series Islander aircraft (Applicability).","Delegated corrective action: requires compliance with manufacturer Mandatory Service Bulletin SB 292 rather than prescribing alternative procedures (Requirement).","Time-linked compliance: inspection timing tied to the next daily check after 4 June 2003 and whenever the affected control rod is disconnected, creating routine operational checkpoints (Compliance).","Operator burden limited to inspection and corrective installation where necessary; parts/fitment work implied but not quantified (Requirement/Background).","Regulatory basis: issued under subregulation 39.1(1) of CASR 1998, giving the CASA delegate authority to mandate the action (preamble)."],"plain_english_summary":"This Airworthiness Directive requires operators of Pilatus Britten‑Norman Islander aircraft (BN2, BN2A, BN2B, BN2T) to inspect and, if necessary, correct the installation of the control‑rod to elevator‑trim‑tab lever bolt retainer in accordance with B‑N Group Mandatory Service Bulletin SB 292 (1 May 2003). Checks must be made at the next daily inspection after 4 June 2003 and whenever the affected control rod is disconnected. The aim is to prevent bolt separation where retainer NB‑03‑5229 may have been fitted incorrectly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-78-control-rod-to-elevator-trim-tab-lever-bolt-retainer","history":"/api/acts/ad-bn-2-78-control-rod-to-elevator-trim-tab-lever-bolt-retainer/history","analysis":"/api/acts/ad-bn-2-78-control-rod-to-elevator-trim-tab-lever-bolt-retainer/analysis","conflicts":"/api/acts/ad-bn-2-78-control-rod-to-elevator-trim-tab-lever-bolt-retainer/conflicts","importantCases":"/api/acts/ad-bn-2-78-control-rod-to-elevator-trim-tab-lever-bolt-retainer/important-cases","documents":"/api/acts/ad-bn-2-78-control-rod-to-elevator-trim-tab-lever-bolt-retainer/documents"}}