{"id":"F2006B04526","name":"AD/BELL 206/73 Amdt 7 - Main Rotor Hub Pillow Block","slug":"ad-bell-206-73-amdt-7-main-rotor-hub-pillow-block","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114236,"registerId":"commonwealth-F2006B04526-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/73 Amdt 7 - Main Rotor Hub Pillow Block","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/BELL 206/73 Amdt 6 and issues the following 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.\n\nBell Helicopter Textron Canada (BHTC) and Agusta Bell 206 Series Helicopters\n\nAD/BELL 206/73\n\nAmdt 7\n\n  \nMain Rotor Hub Pillow Block 13/2002\n\nApplicability: Models 206A, 206BJRII, 206BJRIII, 206B-1, 206L, 206L-1 and 206L-3. All AB206A and AB206B up to S/N 8737.\n\nRequirement: Action in accordance with Bell Helicopter ASB 206-97-90 or ASB 206L-97-108 or Agusta Bolletino Technico 206-227, depending on model.\n\nNote: The requirement document specifies repetitive torque checks after installation of the pillow block hardware.\n\nCompliance: Unless already accomplished, as specified in the requirement document for Bell models. Initially, inspect Agusta Bell models before 25 hours time in service after 27 April 1995.\n\nThis Amendment becomes effective on 26 December 2002.\n\nBackground: The manufacturer introduced improved retention hardware in order to resolve the loss of pillow block clamp bolt/nut preload.\n\nAmendment 6 was issued to include Agusta Bell helicopter models in the applicability.\n\nThis amendment is issued to update the requirement section with the latest applicable service bulletins. The compliance date and times are unaffected by this amendment.\n\nAmendment 6 of this Airworthiness Directive became effective on 27 April 1995\\. Amendment 5 of this Airworthiness Directive became effective on 4 March 1993.\n\n![Signature of David Alan Villiers, Delegate of the Civil Aviation Safety Authority](image.001.jpeg)\n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 14 November 2002\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 4 December 2002.\n\n  \n\nPage 1 of 1","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope. It updates only the reference documents (service bulletins) in the requirement section while explicitly stating that compliance dates and times are unaffected. The applicability remains identical to Amendment 6."},"complexity_factors":["Single page document with straightforward structure","Only 7 defined model variants in applicability section","Simple conditional logic: 'unless already accomplished' and model-specific service bulletins","No nested exceptions or cross-references to other legislation","Clear, sequential sections (Applicability, Requirement, Compliance, Background)","Minimal regulatory jargon — most terms are aviation-specific rather than legally complex"],"plain_english_summary":"This safety order replaces Amendment 6 with Amendment 7 and requires owners/operators of specified Bell 206 series and Agusta Bell AB206 helicopters (serials up to 8737) to follow manufacturer service instructions to fit improved retention hardware in the main-rotor hub pillow block and perform repetitive torque checks. It addresses loss of bolt preload that could cause catastrophic rotor failure and updates the referenced technical documents without changing existing compliance deadlines."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 7 updates which manufacturer service bulletins are cited as the required instructions but does not alter the AD’s aircraft applicability, mandated actions, or compliance times; earlier Amendment 6 expanded applicability to include Agusta Bell models."},"complexity_factors":["Narrow technical scope limited to main rotor hub pillow-block retention hardware.","Cross-references to multiple external manufacturer service bulletins (BHTC ASB 206-97-90; ASB 206L-97-108; Agusta Bolletino 206-227) for the exact procedures.","Model- and serial-number specific applicability (including AB206A/AB206B up to S/N 8737) requiring operator record checks.","Repetitive inspection/torque-check regime and an initial inspection deadline for Agusta models (before 25 hours TIS after 27 April 1995) creates ongoing maintenance scheduling.","Regulatory enforcement under CAR 1998 subregulation 39.1(1) vests compliance discretion with CASA delegate and links instructions to manufacturer documents.","Amendment history: this amendment updates the cited requirement documents without changing compliance times, so implementers must track bulletin versions."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Bell and Agusta Bell 206 helicopters to install improved main-rotor hub pillow-block retention hardware and to perform the manufacturer’s inspections and repetitive torque checks set out in the applicable service bulletins. It applies to listed models and serial ranges (including AB206A/AB206B up to S/N 8737); operators bear the cost and scheduling, and CASA enforces compliance under CAR 1998 to address loss of pillow-block clamp bolt/nut preload."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-73-amdt-7-main-rotor-hub-pillow-block","history":"/api/acts/ad-bell-206-73-amdt-7-main-rotor-hub-pillow-block/history","analysis":"/api/acts/ad-bell-206-73-amdt-7-main-rotor-hub-pillow-block/analysis","conflicts":"/api/acts/ad-bell-206-73-amdt-7-main-rotor-hub-pillow-block/conflicts","importantCases":"/api/acts/ad-bell-206-73-amdt-7-main-rotor-hub-pillow-block/important-cases","documents":"/api/acts/ad-bell-206-73-amdt-7-main-rotor-hub-pillow-block/documents"}}