{"id":"F2006B04403","name":"AD/BELL 205/66 - Main Rotor - Pillow Block Attachment Bolts","slug":"ad-bell-205-66-main-rotor-pillow-block-attachment-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44228,"registerId":"commonwealth-F2006B04403-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/BELL 205/66 Main Rotor - Pillow Block","sectionType":"part","heading":"AD/BELL 205/66 Main Rotor - Pillow Block Attachment Bolts 8/2000","content":"# AD/BELL 205/66 Main Rotor \\- Pillow Block Attachment Bolts 8/2000\n\nApplicability: All models with main rotor yokes P/N 204-011-102-(all dash numbers) installed. Requirement: Action in accordance with Bell Helicopter Textron Alert Service Bulletin 205-90-38\n\nRevision A.\n\nNote 1: FAA AD 92-23-01 refers.\n\nAircraft incorporating stainless steel main rotor yokes are excluded from this directive.\n\nNote 2: BHT Alert SB 205-92-51 refers.\n\nCompliance: As detailed in the Requirement document.\n\nThis Airworthiness Directive becomes effective on 10 August 2000.\n\nBackground: A review of the bolt replacement requirement for Bell 212 helicopters has revealed that it is also applicable to the Model 205. There have been five cases of main rotor pillow block attachment bolt fatigue cracks reported. The requirement is intended to prevent failure of the pillow block attachment bolts and consequent separation of the main rotor assembly. The requirements of the Bell Alert SB are not applicable to the stainless steel main rotor yoke assembly.\n\n![Signature of Bernard Malcom Hole, Delegate of the Civil Aviation Safety Authority](image.002.png)\n\nBernard Malcom Hole\n\nDelegate of the Civil Aviation Safety Authority 27 June 2000\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 12 July 2000.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive expands an existing bolt replacement requirement that applied to the Bell 212 to also cover the Bell 205 after a review (Background). Applicability is to all models with main rotor yokes P/N 204-011-102-(all dash numbers) while explicitly excluding aircraft with stainless-steel main rotor yokes (Applicability; Note)."},"complexity_factors":["Reference to external documents (Bell Alert SB 205-90-38 Rev A) creates dependency on non‑statutory technical material for required actions","Applicability limited by specific part number (P/N 204-011-102-(all dash numbers)), requiring parts-level identification","Explicit exclusion for stainless steel yoke assemblies adds a material-based exception","Cross-references to FAA AD 92-23-01 and BHT Alert SB 205-92-51 increase traceability obligations for maintainers","Compliance timing set 'as detailed in the Requirement document' rather than stated in the AD increases operational planning burden","Safety-critical nature of main rotor attachment bolts raises high consequence for incorrect compliance, increasing scrutiny on maintenance quality"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Bell Model 205 helicopters fitted with main rotor yokes P/N 204-011-102-(all dash numbers) to carry out the inspection/bolt replacement actions set out in Bell Helicopter Textron Alert Service Bulletin 205-90-38 Revision A. Aircraft with stainless-steel main rotor yokes are excluded.\n\nIt affects operators, maintenance organisations and parts suppliers by imposing specified inspection and replacement work to address five reported fatigue cracks and the risk of main rotor separation; compliance is required as specified and became effective 10 August 2000."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It was issued specifically to address the bolt fatigue cracking issue in Bell 205 helicopters with aluminum main rotor yokes, and it does exactly that. The background notes reference related FAA directives and service bulletins for context, but do not expand the binding requirements beyond the original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly used (P/N = part number)","Single, clear applicability test (part number check)","One explicit exclusion (stainless steel yokes)","No nested conditional logic — compliance is straightforward: follow the referenced service bulletin","Minimal cross-referencing (only references to FAA AD and another service bulletin as background notes, not as binding requirements)"],"plain_english_summary":"This AD mandates inspection and replacement of specific main-rotor pillow-block bolts on Bell 205 helicopters with aluminum main-rotor yokes to address reported fatigue cracks. It affects owners/operators of those helicopters and requires compliance with Bell Helicopter Alert Service Bulletin 205-90-38 Revision A to prevent bolt failure and potential rotor separation. Effective 10 August 2000."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-205-66-main-rotor-pillow-block-attachment-bolts","history":"/api/acts/ad-bell-205-66-main-rotor-pillow-block-attachment-bolts/history","analysis":"/api/acts/ad-bell-205-66-main-rotor-pillow-block-attachment-bolts/analysis","conflicts":"/api/acts/ad-bell-205-66-main-rotor-pillow-block-attachment-bolts/conflicts","importantCases":"/api/acts/ad-bell-205-66-main-rotor-pillow-block-attachment-bolts/important-cases","documents":"/api/acts/ad-bell-205-66-main-rotor-pillow-block-attachment-bolts/documents"}}