{"id":"F2006B03511","name":"AD/BAe 146/61 Amdt 2 - Top Skin Stress Corrosion Cracking","slug":"ad-bae-146-61-amdt-2-top-skin-stress-corrosion-cracking","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43071,"registerId":"commonwealth-F2006B03511-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/61 Amdt 2 - Top Skin Stress Corrosion Cracking","content":"![](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 revokes Airworthiness Directive (AD) AD/BAe 146/61 Amdt 1 and issues the following 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\nBritish Aerospace BAe 146 Series Aeroplanes\n\nAD/BAe 146/61\n\nAmdt 2\n\n  \nTop Skin Stress Corrosion Cracking 10/2003\n\nApplicability: All BAe 146 Series 100 aircraft No. E1144 and subsequent. All BAe 146 Series 200 aircraft No. E2148 and subsequent. All BAe 146 Series 300 aircraft No. E3141 and subsequent.\n\nAll Avro 146-RJ70 Series aircraft No. E1223 through to E1267.\n\nAll Avro 146-RJ85 Series aircraft No. E2208 through to E2277, and E2288.\n\nAll Avro 146-RJ100 Series aircraft No. E3221 through to E3276, and E3282, E3283, E3284, and E3286.\n\nRequirement: Inspect in accordance with BAE Systems Mandatory Service Bulletin 57-49 Revision 2.\n\nNote: UK CAA AD 005-06-96 refers.\n\nCompliance: As specified in the Requirement document.\n\nThis Amendment becomes effective on 2 October 2003.\n\nBackground: The manufacturer received reports of stress corrosion cracking on the top wing skin of several aircraft, which was found during routine inspections.\n\nAmendment 1 clarified aircraft applicability.\n\nAmendment 2 is issued in response to a revision of the Requirement document, which incorporates Service Bulletin 57-56 and changes compliance text, with no change in compliance times.\n\nBritish Aerospace BAe 146 Series Aeroplanes\n\nAD/BAe 146/61 Amdt 2 (continued)\n\nThe original issue of this airworthiness directive became effective on 12 September 1996.\n\nAmendment 1 of this Airworthiness Directive became effective on 9 October 1997.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 19 August 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 10 September 2003.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The legislation maintains its original scope of addressing stress corrosion cracking in BAe 146 wing skins. Amendment 2 updates the technical reference documents but does not expand the types of aircraft covered or introduce new safety issues beyond the original corrosion cracking concern."},"complexity_factors":["Multiple aircraft type and serial number ranges in applicability section (6 distinct categories with specific cut-offs)","Cross-reference to external technical document (BAE Systems Mandatory Service Bulletin 57-49 Revision 2) which is not reproduced in the directive itself","Reference to UK CAA AD 005-06-96 creating international regulatory interdependency","Amendment history tracking (original 1996, Amendment 1 1997, Amendment 2 2003) requires understanding cumulative changes","Nested document structure: AD references Service Bulletin, which incorporates Service Bulletin 57-56"],"plain_english_summary":"Australia’s aviation safety regulator (CASA) mandates inspections of the top wing skin on certain BAe 146 and Avro 146‑RJ aircraft to detect stress corrosion cracking that could weaken wing structure. Affected owners/operators must follow BAE Systems Mandatory Service Bulletin 57‑49 Revision 2 and the timing it specifies. This second update replaces a prior amendment to incorporate revised manufacturer instructions without changing inspection timing."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 2 updates the mandated Requirement document (incorporating Service Bulletin 57-56 and changing the compliance text) but, per the background, does not change compliance times or broaden applicability; therefore the regulated population and deadlines remain as previously defined."},"complexity_factors":["Requirement delegates full technical detail and compliance timing to an external document: 'Inspect in accordance with BAE Systems Mandatory Service Bulletin 57-49 Revision 2.'","Applicability is defined by multiple serial‑number ranges across BAe 146 and Avro 146‑RJ variants, creating administrative matching tasks.","Amendment history: revokes AD/BAe 146/61 Amdt 1 and replaces Requirement text, so implementers must track versions ('Amendment 2' and previous effective dates).","Incorporation of an additional service bulletin (57-56) into the Requirement document increases cross‑reference reading.","Enforcement basis cited to CASA subreg 39.1(1), giving regulatory delegate authority to require corrective action.","Compliance text in the AD refers generically to 'Requirement document' and 'as specified', which requires practitioners to obtain and follow that external document for procedural specifics."],"plain_english_summary":"This Airworthiness Directive revokes the prior AD and requires operators of specified BAe 146 and Avro 146‑RJ aircraft to inspect the top wing skin for stress‑corrosion cracking in accordance with BAE Systems Mandatory Service Bulletin 57‑49 Revision 2 (which incorporates Service Bulletin 57‑56). It applies to listed aircraft by serial number and sets compliance timing as stated in the Requirement document. Operators bear the inspection and repair costs; CASA (the delegate) enforces the requirement under CASR subreg 39.1(1)."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-61-amdt-2-top-skin-stress-corrosion-cracking","history":"/api/acts/ad-bae-146-61-amdt-2-top-skin-stress-corrosion-cracking/history","analysis":"/api/acts/ad-bae-146-61-amdt-2-top-skin-stress-corrosion-cracking/analysis","conflicts":"/api/acts/ad-bae-146-61-amdt-2-top-skin-stress-corrosion-cracking/conflicts","importantCases":"/api/acts/ad-bae-146-61-amdt-2-top-skin-stress-corrosion-cracking/important-cases","documents":"/api/acts/ad-bae-146-61-amdt-2-top-skin-stress-corrosion-cracking/documents"}}