{"id":"F2006B10642","name":"AD/HU 269/83 - Tail Rotor Fork Bolt","slug":"ad-hu-269-83-tail-rotor-fork-bolt","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116548,"registerId":"commonwealth-F2006B10642-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/83 - Tail Rotor Fork Bolt","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 269/83 Tail Rotor Fork Bolt  5/87 DM\n\n \n\nApplicability: 1. All 269 Series Helicopters fitted with P/N 269A6034 tail rotor assembly.\n\n \n\n2. All P/N 269A6034 tail rotor assemblies and all P/N 369A1602 tail rotor fork bolts held as spares.\n\n \n\nRequirement: Action in accordance with Schweizer Service Information Notice No. N-208. Compliance:               1. Within 10 hours time in service after 16 March 1987.\n\n2. Before installation on an aircraft after 16 March 1987.\n\n \n\nBackground: The possibility exists that tail rotor fork bolts manufactured between 18 April 1986 and 28 August 1986 did not receive proper processing during manufacture.\n\nIncomplete processing may result in cracking and eventual bolt failure.\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, time-bound safety directive addressing a specific manufacturing defect in a specific aircraft component. It has not expanded beyond its original purpose of grounding/rectifying defective tail rotor bolts."},"complexity_factors":["Single, specific mechanical defect addressed (manufacturing defect in one bolt type)","Only two compliance pathways (in-service aircraft vs. spare parts)","No defined terms section — part numbers and dates are used literally","No cross-references to other legislation beyond generic 'Civil Aviation Regulations 1998, Part 39'","Single external reference to manufacturer service bulletin (Schweizer Service Information Notice N-208)","Straightforward temporal and operational triggers for compliance"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection or replacement of specific tail-rotor fork bolts (P/Ns 269A6034, 369A1602) on Schweizer (Hughes) 269 series helicopters and any spares, because bolts made Apr–Aug 1986 may crack. Operators must comply with Schweizer Service Information Notice N‑208 — for aircraft, within 10 flight hours after 16 Mar 1987; for spares, before installation. It’s legally mandatory because a failed bolt can cause loss of tail-rotor control and catastrophic accidents."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope mirrors the source text: it targets all 269-series helicopters fitted with P/N 269A6034 and spare parts P/N 269A6034/369A1602 (Applicability) and mandates actions per the manufacturer notice (Requirement). There is no expansion beyond those airframes or parts; the instrument adds time-limited and pre-installation compliance but does not broaden applicability beyond the original statement."},"complexity_factors":["Narrow technical scope: applies only to 269-series with P/N 269A6034 and listed spare parts (Applicability).","Mandatory short deadline: 10 hours time in service after the stated date creates operational urgency (Compliance).","Pre-installation prohibition: spares must comply before installation, raising logistics for maintenance providers (Compliance).","Dependency on external document: required action is ‘in accordance with’ Schweizer Service Information Notice No. N-208, creating reliance on manufacturer instructions.","Inspection/repair technicality: verifying processing and detecting cracking requires technical maintenance capability and possible part replacement (Background/Requirement).","Enforcement and recordkeeping burden on operators and maintainers to show compliance to regulator."],"plain_english_summary":"This airworthiness directive orders operators and maintainers of Schweizer (Hughes) 269-series helicopters fitted with tail rotor assembly P/N 269A6034 — and holders of spare assemblies or fork bolts P/N 269A6034/369A1602 — to carry out the corrective actions set out in Schweizer Service Information Notice No. N-208. Actions must be completed within 10 flight hours after 16 March 1987 or before installing affected spares. It responds to a manufacturing processing defect that could cause bolt cracking and eventual failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-83-tail-rotor-fork-bolt","history":"/api/acts/ad-hu-269-83-tail-rotor-fork-bolt/history","analysis":"/api/acts/ad-hu-269-83-tail-rotor-fork-bolt/analysis","conflicts":"/api/acts/ad-hu-269-83-tail-rotor-fork-bolt/conflicts","importantCases":"/api/acts/ad-hu-269-83-tail-rotor-fork-bolt/important-cases","documents":"/api/acts/ad-hu-269-83-tail-rotor-fork-bolt/documents"}}