{"id":"F2006B10600","name":"AD/HU 269/29 - Tail Rotor Blade Assembly - Inspection","slug":"ad-hu-269-29-tail-rotor-blade-assembly-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116463,"registerId":"commonwealth-F2006B10600-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/29 - Tail Rotor Blade Assembly - 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)  Schweizer (Hughes) 269 Series Helicopters\n\n \n\nAD/HU 269/29 Tail Rotor Blade Assembly - Inspection 12/68\n\nApplicability: All models with tail rotor blade assemblies S/Nos up to and including 126-3312. Document:              Hughes SIN N-58.\n\nCompliance: Within 25 hours time in service after 9 December 1968 and thereafter at intervals not exceeding 25 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\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 from 1968 addressing a specific mechanical inspection requirement. It has not expanded beyond its original narrow purpose of ensuring tail rotor blade integrity on affected Hughes/Schweizer helicopters."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 defined elements: applicability (specific serial numbers), document reference, compliance deadline, and recurring interval","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Simple conditional logic: if serial number ≤ 126-3312, then inspect every 25 hours","Single compliance pathway with no exceptions or alternative methods of compliance stated","No nested definitions or interpretive provisions"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) requiring specific maintenance actions on certain helicopters.\n\n**What it does:** Requires owners and operators of Schweizer (formerly Hughes) 269 series helicopters to inspect their tail rotor blade assemblies. This applies to helicopters with tail rotor blades bearing serial numbers up to and including 126-3312.\n\n**What must be done:**\n- **First inspection:** Must be completed within 25 hours of flight time after 9 December 1968\n- **Ongoing inspections:** Must be repeated every 25 hours of flight time thereafter\n\n**Who it affects:** Anyone operating these specific helicopter models — including flight schools, private owners, and commercial operators.\n\n**Why it matters:** Tail rotor failures can cause catastrophic loss of control. This directive addresses a known safety issue identified in Hughes Service Information Notice N-58, ensuring potential defects are caught before they cause accidents.\n\n**Key point:** This is not optional. \"Compliance\" means mandatory adherence — failure to follow an AD can ground an aircraft and expose operators to serious legal penalties."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD text sets a clear, limited scope: it applies to tail rotor blade assemblies with S/Ns up to and including 126-3312 and prescribes an initial and repeating 25-hour inspection schedule. The document contains no language indicating an expansion or narrowing of that scope compared with the directive as written here; no modifications to applicability or compliance windows are evident in the provided text."},"complexity_factors":["Narrow applicability limited to tail rotor assemblies with serial numbers up to 126-3312 (Applicability)","Single, frequent compliance requirement (initial within 25 hours after 9 Dec 1968; then every 25 hours) that is easy to state but operationally demanding (Compliance)","Dependence on an external technical document for inspection procedure (Hughes SIN N-58) introduces a layer of external technical detail not contained in the AD (Document: Hughes SIN N-58)","No alternative compliance methods or exemptions stated in the text, so regulatory discretion or approval would be handled outside the AD (AD text: no alternatives mentioned)","Record-keeping and operational scheduling burdens implicit in the prescribed inspection interval (Compliance)"],"plain_english_summary":"This Airworthiness Directive mandates recurring inspections of tail-rotor blade assemblies on Schweizer (Hughes) 269 helicopters with serial numbers up to 126‑3312, to be done within 25 hours TIS after 9 Dec 1968 and every 25 hours thereafter, per Hughes Service Information Notice N‑58. Owners/operators must arrange and pay for inspections and any repairs; maintenance organisations perform and sign off the work. Compliance is regulatory and imposes recurring operational and cost burdens."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-29-tail-rotor-blade-assembly-inspection","history":"/api/acts/ad-hu-269-29-tail-rotor-blade-assembly-inspection/history","analysis":"/api/acts/ad-hu-269-29-tail-rotor-blade-assembly-inspection/analysis","conflicts":"/api/acts/ad-hu-269-29-tail-rotor-blade-assembly-inspection/conflicts","importantCases":"/api/acts/ad-hu-269-29-tail-rotor-blade-assembly-inspection/important-cases","documents":"/api/acts/ad-hu-269-29-tail-rotor-blade-assembly-inspection/documents"}}