{"id":"F2006B10623","name":"AD/HU 269/62 Amdt 1 - Tail Rotor Hub - Inspection and Modification","slug":"ad-hu-269-62-amdt-1-tail-rotor-hub-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116509,"registerId":"commonwealth-F2006B10623-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/62 Amdt 1 - Tail Rotor Hub - Inspection and Modification","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 269/62\n\nAmdt 1\n\n\nTail Rotor Hub - Inspection and Modification 3/82\n\n \n\nApplicability: All model 269C with S/Nos. 0004 to 0716.\n\n \n\nAll model 269A, TH-55A, 269A-1 and 269B with LTS tail rotor assembly P/N 269A6034 Series.\n\n \n\nAll P/N 369A1725and 369A1725-501 tail rotor hub assemblies. All P/N 369A1725-5 tail rotor assemblies with S/Nos. 001 to 862.\n\nDocument: Hughes SIN No. N-153.1.\n\n \n\nCompliance: Within 100 hours time in service after 31 March, 1982.\n\n \n\nBackground: Manufacturer’s SI Notice Revision 1 extends part number effectivity.\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 narrow, technical safety directive focused on a specific mechanical component (tail rotor hub) on specific helicopter models. The amendment slightly expands the part number coverage based on manufacturer data, but this is consistent with the original purpose of ensuring airworthiness of the tail rotor assembly. No scope creep detected."},"complexity_factors":["Very short document (approximately 200 words)","Only 4 defined applicability categories (specific model/serial number combinations)","Single compliance requirement (100 hours time in service after fixed date)","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","No conditional logic or exceptions","Simple structure: Applicability → Document reference → Compliance deadline → Background"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for certain Schweizer (formerly Hughes) 269 series helicopters.\n\n**What it does:**\n- Requires owners and operators of specific helicopter models to inspect and modify the **tail rotor hub** (the part that holds the tail rotor blades) within 100 hours of flying time after 31 March 1982.\n\n**Who it affects:**\n- Owners and operators of:\n  - Model 269C helicopters with serial numbers 0004 to 0716\n  - Models 269A, TH-55A, 269A-1, and 269B with specific tail rotor assemblies (part number 269A6034 series)\n  - Specific tail rotor hub assemblies (part numbers 369A1725, 369A1725-501, and 369A1725-5 with serial numbers 001 to 862)\n\n**Why it matters:**\n- This directive addresses a safety issue with the tail rotor hub. The manufacturer (Hughes, now Schweizer) issued a Service Information Notice (a technical bulletin) that expanded the list of affected parts. This Airworthiness Directive makes compliance mandatory to prevent potential tail rotor failures, which could cause loss of control of the helicopter.\n\n**Key point:** This is an **amendment** (Amendment 1) that expands the original directive to cover more part numbers than originally specified."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The directive extends scope relative to the original item by adopting the manufacturer’s Service Information Notice Revision 1 which 'extends part number effectivity' (Background). Concretely, the Applicability lists additional part numbers and serial-number ranges (Applicability; Background), meaning more tail rotor hub assemblies and tail rotor assemblies are now covered and their owners/operators must comply."},"complexity_factors":["Narrow, clearly stated applicability by model, serial number and part number (Applicability)","Single, short compliance window with a precise deadline (100 hours TIS after 31 March 1982) (Compliance)","Technical procedures not included in the directive and delegated to an external manufacturer Service Information Notice (Document), requiring operators to obtain and follow that document","Multiple part numbers and serial-number ranges require verification of individual aircraft/parts","Practical implementation depends on availability of approved maintenance resources and possible replacement parts (implicit from Inspection and Modification requirement)"],"plain_english_summary":"This AD requires owners/operators of certain Hughes/Schweizer 269-series helicopters and specified tail‑rotor hub/assembly part numbers to have the tail‑rotor hub inspected and modified per the manufacturer’s Service Information Notice (Hughes SIN No. N‑153.1). It applies to defined 269 models and serials and to listed hub/assembly P/Ns, must be done within 100 hours TIS after 31 March 1982, and places compliance costs and scheduling onto the affected operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-62-amdt-1-tail-rotor-hub-inspection-and-modification","history":"/api/acts/ad-hu-269-62-amdt-1-tail-rotor-hub-inspection-and-modification/history","analysis":"/api/acts/ad-hu-269-62-amdt-1-tail-rotor-hub-inspection-and-modification/analysis","conflicts":"/api/acts/ad-hu-269-62-amdt-1-tail-rotor-hub-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-hu-269-62-amdt-1-tail-rotor-hub-inspection-and-modification/important-cases","documents":"/api/acts/ad-hu-269-62-amdt-1-tail-rotor-hub-inspection-and-modification/documents"}}