{"id":"F2006B03543","name":"AD/BAe 146/96 - Webs/Flanges of Frames 15, 18, 41, and 43","slug":"ad-bae-146-96-webs-flanges-of-frames-15-18-41-and-43","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43110,"registerId":"commonwealth-F2006B03543-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.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.\n\nBritish Aerospace BAe 146 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/BAe 146/96 Webs/Flanges of Frames 15,","sectionType":"part","heading":"AD/BAe 146/96 Webs/Flanges of Frames 15, 18, 41, and 43 3/2002","content":"# AD/BAe 146/96 Webs/Flanges of Frames 15, 18, 41, and 43 3/2002\n\nApplicability: All BAe 146 Series 100, 200, and 300 aircraft. All Avro 146-RJ70, -RJ85, and -RJ100 aircraft.\n\nThose aircraft without modifications HCM30514A or C, and B or D incorporated. Requirement: Inspect in accordance with BAE Systems Mandatory Service Bulletin ISB.53-165. Compliance: As specified in the Requirement document.\n\nThis Airworthiness Directive becomes effective on 21 March 2002.\n\nBackground: Possible ingress of moisture and subsequent corrosion leading to cracking has been discovered at the inner webs/flanges of frame 18.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 8 February 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 27 February 2002.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific corrosion/cracking issue in specific airframe locations on specific aircraft models. The 2002 revision (indicated by '3/2002') appears to be a routine amendment or reissue rather than a scope expansion."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined applicability criteria (aircraft series and modification status)","Single requirement referencing an external technical document (the Service Bulletin)","No nested exceptions or conditional logic — straightforward 'if applicable, then inspect' structure","No cross-references to other legislation beyond the enabling regulation (CAR 1998 subreg 39.1(1))"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection of the webs and flanges on frames 15, 18, 41 and 43 of BAe 146 Series 100/200/300 and Avro 146‑RJ70/85/100 aircraft that have not received mods HCM30514A/C or B/D. Per BAE Systems Mandatory Service Bulletin ISB.53‑165, operators must inspect for corrosion and cracking (frame‑18 moisture ingress risk). Effective 21 March 2002."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text sets a clear, limited scope: all BAe 146 Series 100/200/300 and Avro 146‑RJ variants, except aircraft with specified modifications. The AD specifies inspection and compliance via the named service bulletin. The document gives no indication the scope has been expanded or reduced from an earlier version."},"complexity_factors":["Narrow applicability: specific aircraft models and listed frame locations reduce scope (Applicability).","Exceptions for aircraft with modifications HCM30514A/C or B/D require operators to check modification status before action (Applicability).","Mandated method: compliance must follow an external technical document (BAE Systems Mandatory Service Bulletin ISB.53‑165), creating operational dependency on that document (Requirement; Compliance).","Regulatory authority: directive issued under CAR 1998 subreg 39.1(1), centralising decision with CASA’s delegate (opening paragraph; signature).","Implementation burden is operational: inspections, possible repairs and scheduling downtime fall on aircraft operators (Requirement; Compliance).","Identified defect is localized (ingress of moisture, corrosion and cracking at frame 18), which limits inspection targets but may require structural repair if found (Background)."],"plain_english_summary":"This Airworthiness Directive orders operators of BAe 146 Series and Avro 146‑RJ aircraft (except those fitted with modifications HCM30514A/C and B/D) to inspect the inner webs and flanges of frames 15, 18, 41 and 43 for corrosion or cracking, following BAE Systems Mandatory Service Bulletin ISB.53‑165, and to comply at the times specified in that document. (Applicability; Requirement; Compliance.) Operators pay for inspections and any repairs; the CASA delegate mandated the action under CAR 1998 subreg 39.1(1). (Background; opening paragraph.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-96-webs-flanges-of-frames-15-18-41-and-43","history":"/api/acts/ad-bae-146-96-webs-flanges-of-frames-15-18-41-and-43/history","analysis":"/api/acts/ad-bae-146-96-webs-flanges-of-frames-15-18-41-and-43/analysis","conflicts":"/api/acts/ad-bae-146-96-webs-flanges-of-frames-15-18-41-and-43/conflicts","importantCases":"/api/acts/ad-bae-146-96-webs-flanges-of-frames-15-18-41-and-43/important-cases","documents":"/api/acts/ad-bae-146-96-webs-flanges-of-frames-15-18-41-and-43/documents"}}