{"id":"F2006B10506","name":"AD/HS 125/66 - Main Landing Gear Wheels - Inspection","slug":"ad-hs-125-66-main-landing-gear-wheels-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116275,"registerId":"commonwealth-F2006B10506-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/66 - Main Landing Gear Wheels - 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)  British Aerospace BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/66 Main Landing Gear Wheels - Inspection 8/84\n\nApplicability: All models HS/DH/BH 125 Series aircraft up to and including Series 700. Requirement:               British Aerospace 125 SB No. 32-201.\n\nNote: The eddy current scan pattern shall be as shown in Fig. 1 of Appendix A and the probe shall be jigged to ensure that the scan index is accurately maintained.\n\n \n\nCompliance: Inspect prior to 31 August 1984, as detailed in the Requirement Document. Background:               Main wheel flange fracture has occurred with resultant structural damage.\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to all HS/DH/BH 125 series aircraft up to Series 700 and requires the inspection described in the manufacturer’s service bulletin to be completed by 31 August 1984 (Applicability; Requirement; Compliance). There is no text in the instrument indicating an expansion or narrowing of that original scope."},"complexity_factors":["Narrow applicability: single aircraft family and limited serial range (Applicability).","Single required action: one technical inspection method specified (Requirement; Note).","Technical specificity: mandatory eddy-current scan pattern and requirement to jig the probe increases technical execution complexity (Note).","Dependence on external document: procedural detail delegated to British Aerospace Service Bulletin No. 32-201 (Requirement).","Fixed compliance deadline creates scheduling constraint for operators (Compliance)."],"plain_english_summary":"This directive requires owners/operators of British Aerospace BAe 125 (HS/DH/BH up to Series 700) to carry out an eddy‑current inspection of main landing‑gear wheel flanges, following BA Service Bulletin 32‑201 and the mandated scan pattern/jig, completed by 31 August 1984. It’s designed to detect flange cracks after a reported fracture, shifts inspection and remediation costs to operators, and limits procedural discretion by mandating the manufacturer’s test method."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1984 for a specific mechanical defect. It has not grown beyond its original purpose of mandating a one-time wheel inspection."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined term implicitly referenced (the Service Bulletin)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single, unambiguous compliance deadline (31 August 1984)","No conditional logic or exceptions — applies to all listed aircraft models without exemptions","Technical content is procedural rather than legal in complexity"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners and operators of certain British Aerospace BAe 125 series business jets to inspect their main landing gear wheels for cracks before 31 August 1984.\n- The inspection must follow a specific technical procedure (British Aerospace Service Bulletin No. 32-201) using a specialised technique called **eddy current testing** — a way of detecting hidden cracks in metal without taking the wheel apart.\n- The directive includes precise technical requirements about how to move the scanning probe to ensure the inspection is thorough.\n\n**Who it affects:**\n- Owners and operators of HS/DH/BH 125 series aircraft built up to and including the Series 700 models.\n- Maintenance engineers who must carry out the inspection.\n\n**Why it matters:**\n- The directive was issued because main wheel flanges (the rim part of the wheel that holds the tyre) had actually fractured on these aircraft, causing structural damage. A wheel failure during takeoff or landing could be catastrophic. This order forces a one-time inspection to catch cracks before they cause accidents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-66-main-landing-gear-wheels-inspection","history":"/api/acts/ad-hs-125-66-main-landing-gear-wheels-inspection/history","analysis":"/api/acts/ad-hs-125-66-main-landing-gear-wheels-inspection/analysis","conflicts":"/api/acts/ad-hs-125-66-main-landing-gear-wheels-inspection/conflicts","importantCases":"/api/acts/ad-hs-125-66-main-landing-gear-wheels-inspection/important-cases","documents":"/api/acts/ad-hs-125-66-main-landing-gear-wheels-inspection/documents"}}