{"id":"F2006B09754","name":"AD/F28/17 - Main Landing Gear Wheel - Inspection","slug":"ad-f28-17-main-landing-gear-wheel-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54611,"registerId":"commonwealth-F2006B09754-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/17 - Main Landing Gear Wheel - 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)  Fokker F28 Series Aeroplanes\n\n \n\nAD/F28/17 Main Landing Gear Wheel - Inspection NK\n\nApplicability: All models.\n\n \n\nRequirement: Inspect Goodyear Main Landing Gear wheels in the area of the internal flange radius using either an approved eddy current or ultrasonic technique.\n\n \n\nCompliance: At each tyre removal after 3 August 1971.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on Fokker F28 main landing gear wheel inspections. It has not expanded beyond its original safety purpose. The 1971 date indicates this is a historical directive that has remained stable in scope."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 substantive content lines (Applicability, Requirement, Compliance, plus header)","No defined terms section","No cross-references to other legislation or regulations","Single, unambiguous compliance trigger (tyre removal after specified date)","No nested conditions or exceptions","Simple binary inspection method choice (eddy current OR ultrasonic)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to all models of **Fokker F28 series aircraft**.\n\n**What it requires:**\nOwners and operators must inspect the **Goodyear main landing gear wheels** on these planes. Specifically, they need to check the area around the **internal flange radius** (a curved part inside the wheel structure) using either:\n- An **eddy current** inspection (a non-destructive testing method using electromagnetic fields to detect cracks), or\n- An **ultrasonic** inspection (using high-frequency sound waves to find internal flaws)\n\n**When to do it:**\nEvery time a tyre is removed from the wheel, but only for tyre removals happening **after 3 August 1971**.\n\n**Why it matters:**\nThis directive was issued to prevent wheel failures that could lead to dangerous landing incidents. The date reference (1971) suggests this addresses a known structural weakness discovered in service. Airworthiness directives are legally binding — compliance is not optional, and failure to follow them can ground an aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text sets a specific inspection obligation and does not indicate any expansion or narrowing of scope from an earlier instrument within the text provided. It applies to all Fokker F28 models with Goodyear main wheels and prescribes method and frequency; there is no statement in the instrument that the scope has been changed."},"complexity_factors":["Clear, short prescription with three distinct elements: applicability, inspection method, and compliance frequency.","Technical requirement for non‑destructive testing (eddy‑current or ultrasonic) introduces some specialised equipment and training needs.","Unspecified approval process for the testing methods creates administrative ambiguity and potential variation in implementation.","Repetitive operational requirement (inspection at every tyre removal) increases ongoing compliance workload.","Limited cross‑references or procedural detail in the text (no corrective action, reporting, or approver specified) keeps the directive simple but leaves implementation choices to operators and regulators."],"plain_english_summary":"This directive requires operators and maintenance organisations of Fokker F28 aeroplanes with Goodyear main landing‑gear wheels to perform an approved eddy‑current or ultrasonic inspection of the wheel internal flange radius each time a tyre is removed (post‑3 August 1971). It matters because it creates recurring labour and equipment/contracting costs, can lengthen tyre‑change turnarounds, and relies on an unspecified approval process for acceptable NDT techniques."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-17-main-landing-gear-wheel-inspection","history":"/api/acts/ad-f28-17-main-landing-gear-wheel-inspection/history","analysis":"/api/acts/ad-f28-17-main-landing-gear-wheel-inspection/analysis","conflicts":"/api/acts/ad-f28-17-main-landing-gear-wheel-inspection/conflicts","importantCases":"/api/acts/ad-f28-17-main-landing-gear-wheel-inspection/important-cases","documents":"/api/acts/ad-f28-17-main-landing-gear-wheel-inspection/documents"}}