{"id":"F2012L01164","name":"CASA 12/3224 - Approval - Alternative Means of Compliance (AMOC) against paragraph (l)(4) of Federal Aviation Administration Airworthiness Directive (FAA AD) 2009-26-11 for Thrush Aircraft Inc. S2R Series Aircraft","slug":"casa-12-3224-approval-alternative-means-of-compliance-amoc-against-paragraph-l-4-of-federal-aviation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":163146,"registerId":"commonwealth-F2012L01164-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"CASA 12/3224 - Approval - Alternative Means of Compliance (AMOC) against paragraph (l)(4) of Federal Aviation Administration Airworthiness Directive (FAA AD) 2009-26-11 for Thrush Aircraft Inc. S2R Series Aircraft","content":"Instrument Number: 12/3224\n\nI, Mike Higgins, Manager Continuing Airworthiness, a delegate of CASA, make this instrument under paragraph 39.004(3)(a) of the Civil Aviation Safety Regulations 1998.\n\n![](image.001.png)\n\nMike Higgins\n\nManager Continuing Airworthiness\n\nAirworthiness and Engineering Branch\n\nDate 4 June 2012\n\nApproval – Alternative Means of Compliance (AMOC) against paragraph (l)(4) of Federal Aviation Administration Airworthiness Directive (FAA AD) 2009-26-11 for Thrush Aircraft Inc. S2R Series Aircraft.\n\n1 Duration\n\nThis instrument:\n\n(a) commences on 8 June 2012; and\n\n(b) ceases to have effect if FAA AD 2009-26-11 is amended or cancelled.\n\n2 Application\n\nThis instrument applies to a registered operator who operates a Thrush Aircraft Inc. S2R series aircraft mentioned in AD 2009-26-11 issued by the FAA that have had the wing front lower spar cap P/N 20207-XX replaced using a CASA approved procedure.\n\n3 AMOC\n\nI approve, as a means of compliance with the AD, other than that set out in the AD, the following:\n\n(a) for a Thrush Aircraft Inc. S2R series aircraft the use of CASA approved wing front lower spar cap replacement procedure as an alternative to an FAA approved replacement procedure or that provided by the manufacturer at delivery of the airplane stated at paragraph (l)(4) of FAA AD 2009-26-11.\n\nAll other requirements stated in the AD are applicable.","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 instrument maintains its original narrow scope. It was clearly intended from the outset as a specific, limited approval for one aircraft type and one maintenance procedure, and remains precisely that."},"complexity_factors":["Single, narrow scope: applies only to one specific aircraft series (Thrush S2R) and one specific part replacement","Only 3 short operative sections (Duration, Application, AMOC)","Zero defined terms in an interpretation section","Minimal conditional logic: only one substantive condition (aircraft must have had part replaced using CASA-approved procedure)","Single cross-reference: to FAA AD 2009-26-11, paragraph (l)(4)","Self-terminating mechanism (ceases if FAA AD amended/cancelled) is straightforward","Total length: approximately 200 words of operative text"],"plain_english_summary":"This instrument lets Australian operators of Thrush Aircraft S2R crop-dusters use a CASA‑approved wing front lower spar cap replacement procedure as an Alternative Means of Compliance to one specific paragraph of the US FAA Airworthiness Directive. It applies to Australian‑registered S2R aircraft where the CASA procedure was used, leaves all other AD requirements intact, and automatically ceases if the FAA AD is amended or cancelled."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument does not expand or reduce the substantive obligations of FAA AD 2009-26-11; it authorises a CASA-approved alternative procedure for a specific part replacement only and preserves all other AD requirements. The approval is conditional (applies where the replacement used a CASA-approved procedure) and terminates if the FAA AD changes (ss.1–3)."},"complexity_factors":["Very narrow technical scope: applies only to Thrush S2R series and a specific part (wing front lower spar cap P/N 20207-XX).","Dependence on external instrument: ceases if FAA AD 2009-26-11 is amended or cancelled (s.1(b)).","Regulatory delegation: approval made by CASA delegate under paragraph 39.004(3)(a) — single-decision authority noted in instrument header.","Compliance burden on operators to use and document a CASA-approved replacement procedure (s.2–3).","No alteration of other AD requirements; interplay limited to substituting the approved replacement procedure (s.3)."],"plain_english_summary":"This instrument allows registered operators of Thrush S2R aircraft to meet FAA AD 2009-26-11 paragraph (l)(4) by using a CASA-approved procedure to replace the wing front lower spar cap (P/N 20207-XX) instead of the FAA- or manufacturer-approved method. It starts 8 June 2012 and ends if the FAA AD is amended or cancelled. CASA (delegate Mike Higgins) approved the alternative means of compliance; operators bear the cost and must document compliance (ss.1–3)."}},"importantCases":[],"_links":{"self":"/api/acts/casa-12-3224-approval-alternative-means-of-compliance-amoc-against-paragraph-l-4-of-federal-aviation","history":"/api/acts/casa-12-3224-approval-alternative-means-of-compliance-amoc-against-paragraph-l-4-of-federal-aviation/history","analysis":"/api/acts/casa-12-3224-approval-alternative-means-of-compliance-amoc-against-paragraph-l-4-of-federal-aviation/analysis","conflicts":"/api/acts/casa-12-3224-approval-alternative-means-of-compliance-amoc-against-paragraph-l-4-of-federal-aviation/conflicts","importantCases":"/api/acts/casa-12-3224-approval-alternative-means-of-compliance-amoc-against-paragraph-l-4-of-federal-aviation/important-cases","documents":"/api/acts/casa-12-3224-approval-alternative-means-of-compliance-amoc-against-paragraph-l-4-of-federal-aviation/documents"}}