{"id":"F2006B04364","name":"AD/BELL 205/23 Amdt 4 - Main Rotor Blades","slug":"ad-bell-205-23-amdt-4-main-rotor-blades","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44188,"registerId":"commonwealth-F2006B04364-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 205/23 Amdt 4 - Main Rotor Blades","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBell Helicopter Textron 205 Series Helicopters\n\nAD/BELL 205/23\n\nAmdt 4\n\n  \nMain Rotor Blades 3/88\n\nApplicability: All model 205A-1 helicopters fitted with main rotor blades P/No 204-011-250 (all dash numbers).\n\nRequirement: Inspect in accordance with Parts I and III of Bell SB 205-75-5 Revision C.\n\nNote: It is recommended that the root end of each blade be painted white to enhance crack detectability. Wash and apply WD-40 in accordance with Part II of that SB.\n\nCompliance: As detailed in the Requirement Document.\n\nBackground: There have been several instances, including one recently in Australia, where an adhesive bond failure and/or corrosion has led to serious fatigue cracking of the main rotor blade, at the main retention pin hole. This Directive requires regular inspections for edge voids, corrosion and cracking, as well as “WD-40\" treatment for corrosion prevention. To improve crack visibility one operator has painted the root end of each main rotor blade white. This Amendment adds a recommendation to that effect, and deletes the ambiguous clause, “unless already accomplished\".","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2230},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This version expands the safety guidance by adding an explicit recommendation to paint blade roots white for improved crack detection. It also removes the ambiguous clause 'unless already accomplished' that created confusion in previous versions about whether the requirements applied retroactively."},"complexity_factors":["Single, unambiguous applicability criterion (specific helicopter model and part number)","Straightforward compliance requirement referencing external technical standard (Service Bulletin)","No nested exceptions or conditional logic","Brief document with minimal defined terms"],"plain_english_summary":"Owners and operators of Bell 205A-1 helicopters with main rotor blades P/N 204-011-250 must perform regular inspections and corrosion-prevention per Bell Service Bulletin 205-75-5 Revision C to detect cracking, corrosion, and edge voids in the blade root and prevent catastrophic blade failure. The rule also requires cleaning and WD-40 treatment and recommends painting blade roots white to aid visual detection of cracks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-205-23-amdt-4-main-rotor-blades","history":"/api/acts/ad-bell-205-23-amdt-4-main-rotor-blades/history","analysis":"/api/acts/ad-bell-205-23-amdt-4-main-rotor-blades/analysis","conflicts":"/api/acts/ad-bell-205-23-amdt-4-main-rotor-blades/conflicts","importantCases":"/api/acts/ad-bell-205-23-amdt-4-main-rotor-blades/important-cases","documents":"/api/acts/ad-bell-205-23-amdt-4-main-rotor-blades/documents"}}