{"id":"F2006B09668","name":"AD/F24/1 Amdt 1 - Undercarriage Strut - Inspection","slug":"ad-f24-1-amdt-1-undercarriage-strut-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115800,"registerId":"commonwealth-F2006B09668-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F24/1 Amdt 1 - Undercarriage Strut - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Fairchild F24 Series Aeroplanes\n\n \n\nAD/F24/1\n\nAmdt 1\n\n\nUndercarriage Strut - Inspection NK\n\n \n\nApplicability: All models R9, R40 and W. Document:  1. Fairchild SB No. 41-8; or\n\n2. FAA AD 47-50-9; or\n\n \n\n3. ANO 105.1.17.1.6.1.\n\n \n\nCompliance: At intervals not exceeding 100 hours time in service.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text contains the current applicability (models R9, R40 and W), the documents to be followed, and the compliance interval (≤100 hours). The extract does not include any comparison to prior wording or indicate a change in scope. On that basis there is no evidence in the provided instrument that the scope has changed from any earlier version."},"complexity_factors":["Brief, single-subject directive focused on one component (undercarriage strut).","Clear applicability limited to specific aircraft models (R9, R40, W).","Prescriptive compliance interval (≤100 hours time in service) simplifies enforcement.","Procedural details are not included and are delegated to three external documents, requiring operators to consult those sources.","Amendment label present (Amdt 1) but no text in this extract showing what, if anything, changed from prior versions.","Use of the shorthand “NK” in the title is not explained in the supplied text, creating minor ambiguity."],"plain_english_summary":"This airworthiness directive requires owners/operators of Fairchild F24 R9, R40 and W aircraft to inspect the undercarriage strut at intervals no greater than 100 hours TIS, using procedures in Fairchild SB 41‑8, FAA AD 47‑50‑9 or ANO 105.1.17.1.6.1. \n\nIssued by CASA, it assigns recurring inspection costs, scheduling and maintenance responsibility to operators to ensure continued undercarriage airworthiness."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific mechanical inspection for specific aircraft models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 3 defined applicability criteria (specific aircraft models)","Single compliance requirement with clear time interval (100 hours)","No nested conditions, exceptions, or cross-references to other legislation sections","References external technical documents rather than embedding complex procedures","No penalty provisions, appeal mechanisms, or administrative procedures included"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **Fairchild F24 series aeroplanes** (models R9, R40, and W).\n\n**What it requires:**\n- Owners and operators must **inspect the undercarriage strut** (the landing gear support structure) on these aircraft.\n- The inspection must be done **every 100 hours of flight time** (\"time in service\" means actual flying hours, not time parked).\n\n**Why it matters:**\n- Undercarriage struts can develop cracks or fatigue over time. If they fail, the landing gear could collapse during takeoff or landing — a serious safety risk.\n- This directive ensures potential problems are caught before they cause accidents.\n\n**Where the rules come from:**\nThe directive references three technical documents that contain the detailed inspection procedures:\n- Fairchild Service Bulletin No. 41-8\n- FAA Airworthiness Directive 47-50-9 (American equivalent)\n- Australian National Order 105.1.17.1.6.1\n\n**Who must comply:**\nAnyone operating these specific Fairchild aircraft in Australia — private owners, flying schools, or commercial operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f24-1-amdt-1-undercarriage-strut-inspection","history":"/api/acts/ad-f24-1-amdt-1-undercarriage-strut-inspection/history","analysis":"/api/acts/ad-f24-1-amdt-1-undercarriage-strut-inspection/analysis","conflicts":"/api/acts/ad-f24-1-amdt-1-undercarriage-strut-inspection/conflicts","importantCases":"/api/acts/ad-f24-1-amdt-1-undercarriage-strut-inspection/important-cases","documents":"/api/acts/ad-f24-1-amdt-1-undercarriage-strut-inspection/documents"}}