{"id":"F2017L00368","name":"AEB 17/1583 - Approval – Means of Compliance with Transport Canada Airworthiness Directive (AD) CF-2011-24 - Wing to Fuselage Attachment Joints - Barrel Nut Cracking","slug":"aeb-17-1583-approval-means-of-compliance-with-transport-canada-airworthiness-directive-ad-cf-2011-24","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":96091,"registerId":"commonwealth-F2017L00368-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Instrument Number AEB 17/1583","sectionType":"part","heading":"Instrument Number AEB 17/1583","content":"# Instrument Number AEB 17/1583\n\nI, Pieter van Dijk, a delegate of the Civil Aviation Safety Authority, make this instrument under paragraph 39.004(3)(a) of the Civil Aviation Safety Regulations 1998.\n\n![\\\\casa.local\\dfs\\home\\vandijk_p\\Desktop\\pvd signature.jpg](image.001.jpeg)\n\nPieter van Dijk\n\nContinuing Airworthiness Section Manager\n\n30 March 2017\n\nApproval – Means of Compliance with Transport Canada Airworthiness Directive (AD) CF-2011-24 - Wing to Fuselage Attachment Joints - Barrel Nut Cracking\n\n1.  Duration\n\nThis instrument:\n\n(a) commences on the date of registration; and\n\n(b) ceases to have effect if Transport Canada AD CF-2011-24 (the AD) is amended.\n\n2. Application\n\nThis instrument applies to a registered operator who operates a type of aircraft mentioned in the AD, as in force at the date of this instrument, issued by Transport Canada.\n\n3. Approval\n\nI approve, as a means of compliance with the AD, the replacement of alloy steel barrel nuts with INCONEL barrel nuts in accordance with either:  \n\n(a) Bombardier modification summary package 4-123841, 4-113769 or 4-113768, as in force at the date of this instrument, or\n\n(b) Bombardier service bulletin 84-57-26, as in force at the date of this instrument.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument does not expand or narrow the set of aircraft affected by the underlying AD; it simply approves particular means of compliance (INCONEL barrel-nut replacement per specified Bombardier documents). Applicability remains limited to registered operators of the aircraft types named in the Transport Canada AD and the approval automatically lapses if that AD is amended."},"complexity_factors":["Cross-reference to an external instrument (Transport Canada AD CF-2011-24) — dependence on the AD's scope and text","Reference to external technical documents (Bombardier modification packages and service bulletin) and version-locking to 'as in force at the date of this instrument'","Temporal condition: approval commences on registration and ceases if the AD is amended","Delegated decision-making basis (made under paragraph 39.004(3)(a) of the CASR)","Narrow, technical subject-matter (single hardware replacement) reduces legal complexity","Compliance burden lies with operators (cost and operational work to implement replacement)"],"plain_english_summary":"This instrument approves a specific way to comply with Transport Canada AD CF-2011-24: replace alloy-steel wing-to-fuselage barrel nuts with INCONEL nuts using the listed Bombardier modification packages or service bulletin. It applies to registered Australian operators of the aircraft types named in that AD. It begins on registration and ends if the AD is amended. Operators pay to carry out the approved replacements; the CASA delegate authorises the permitted procedures and limits compliance to the listed documents."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument remains tightly scoped to its original purpose: providing a specific means of compliance for one particular Canadian airworthiness directive affecting specific Bombardier aircraft. It has not expanded beyond this narrow technical approval function."},"complexity_factors":["Very short instrument (only 3 operative sections plus metadata)","Only 1 defined term implicitly referenced ('the AD')","No cross-references to other legislation beyond the enabling regulation (CASR 39.004(3)(a))","Simple conditional structure: single approval with two alternative compliance paths (paragraphs 3(a) and 3(b))","No nested exceptions or complex temporal provisions","Technical complexity exists in the subject matter (aircraft engineering) but the legal instrument itself is straightforward"],"plain_english_summary":"This instrument lets Australian operators of the Bombardier types subject to Transport Canada AD CF-2011-24 use a specific approved repair: replacing cracked steel wing-to-fuselage barrel nuts with stronger INCONEL barrel nuts. It applies only to operators who elect this repair and requires following Bombardier modification/service documents as they existed on 30 March 2017.\n\nIt matters because wing attachment integrity is critical; the approval removes uncertainty about whether the Canadian fix meets Australian safety requirements and remains valid until the Canadian AD is amended."}},"importantCases":[],"_links":{"self":"/api/acts/aeb-17-1583-approval-means-of-compliance-with-transport-canada-airworthiness-directive-ad-cf-2011-24","history":"/api/acts/aeb-17-1583-approval-means-of-compliance-with-transport-canada-airworthiness-directive-ad-cf-2011-24/history","analysis":"/api/acts/aeb-17-1583-approval-means-of-compliance-with-transport-canada-airworthiness-directive-ad-cf-2011-24/analysis","conflicts":"/api/acts/aeb-17-1583-approval-means-of-compliance-with-transport-canada-airworthiness-directive-ad-cf-2011-24/conflicts","importantCases":"/api/acts/aeb-17-1583-approval-means-of-compliance-with-transport-canada-airworthiness-directive-ad-cf-2011-24/important-cases","documents":"/api/acts/aeb-17-1583-approval-means-of-compliance-with-transport-canada-airworthiness-directive-ad-cf-2011-24/documents"}}