{"id":"F2006B04785","name":"AD/BN-2/72 - Wing Access Panel","slug":"ad-bn-2-72-wing-access-panel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44566,"registerId":"commonwealth-F2006B04785-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.002.png)\n\n![](image.002.png)  \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 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.","sortOrder":0},{"sectionNumber":"AD/BN-2/72 Wing Access Panel 1/2001","sectionType":"part","heading":"AD/BN-2/72 Wing Access Panel 1/2001","content":"# AD/BN-2/72 Wing Access Panel 1/2001\n\nApplicability: All BN2A, BN2B, and BN2T series Islander aircraft.\n\nRequirement: Action in accordance with B-N Group Ltd. Mandatory Service Bulletin No. 274.\n\nCompliance: At the next 1,000 hour inspection or Service Bulletin No. 190 inspection, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 25 January 2001.\n\nBackground: The manufacturer received reports of severe corrosion found in the wing box.\n\nInstallation of Modification NB-M-1594 allows easier access to the wing box for the two year inspection requirement, by creating bolted access panels at the existing riveted panel positions (because of enlargement of rivet holes through wear during rivet removal/refitment).\n\n![](image.003.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 5 December 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 20 December 2000.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD's scope remains aligned with its stated purpose: it applies to all BN2A/B/T Islanders and mandates installation of Modification NB‑M‑1594 per the manufacturer's Service Bulletin, to be completed at the next specified inspection. The Background explains the corrosion reports motivating the measure but does not expand applicability or requirements beyond the stated action."},"complexity_factors":["Narrow applicability: only BN2A, BN2B and BN2T Islander aircraft are affected (Applicability).","Single, specific mandated action: follow B‑N Group Mandatory Service Bulletin No. 274 (Requirement).","Simple, fixed compliance trigger: next 1,000‑hour or Service Bulletin No. 190 inspection, whichever is first (Compliance).","Technical installation work may require maintenance facilities and parts (Modification NB‑M‑1594; Background).","Costs and scheduling fall on aircraft owners/operators (implicit in Requirement and Compliance).","Low regulatory discretion: delegate issued AD under CAR subregulation 39.1(1); no staged options or exemptions in text."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of all BN2A, BN2B and BN2T Islander aircraft to install Modification NB‑M‑1594 by following B‑N Group Mandatory Service Bulletin No. 274 (Requirement). Compliance is at the next 1,000‑hour inspection or Service Bulletin No. 190 inspection, whichever occurs first (Compliance). The measure responds to reported severe wing‑box corrosion (Background). Operators pay and must schedule the work; the modification creates bolted access panels to ease two‑year inspections and reduce rivet wear."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","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 corrosion issue in a specific aircraft type (Britten-Norman Islander). The modification to allow easier access is directly related to the original inspection requirement and does not expand the AD's reach beyond the identified unsafe condition."},"complexity_factors":["Very short document (approximately 250 words)","Only 3 defined applicability categories (BN2A, BN2B, BN2T series)","Single requirement referencing an external document (Service Bulletin No. 274)","Simple compliance trigger (whichever occurs first of two inspection intervals)","No nested exceptions or conditional logic","No cross-references to other legislation beyond the enabling regulation (CAR 1998 subregulation 39.1(1))","Straightforward background explaining the safety rationale"],"plain_english_summary":"This Airworthiness Directive applies to all Islander (BN2A/BN2B/BN2T) aircraft and requires owners/operators to inspect the wing box for severe corrosion, comply with Manufacturer Service Bulletin 274, and install bolted access panels replacing riveted panels to ease future inspections. It addresses a safety risk—corrosion that could weaken the wing and cause structural failure—and must be done at the next 1,000‑hour inspection or the next Service Bulletin 190 inspection, whichever occurs first. Issued by a CASA delegate."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-72-wing-access-panel","history":"/api/acts/ad-bn-2-72-wing-access-panel/history","analysis":"/api/acts/ad-bn-2-72-wing-access-panel/analysis","conflicts":"/api/acts/ad-bn-2-72-wing-access-panel/conflicts","importantCases":"/api/acts/ad-bn-2-72-wing-access-panel/important-cases","documents":"/api/acts/ad-bn-2-72-wing-access-panel/documents"}}