{"id":"F2006B04440","name":"AD/BELL 206/125 Amdt 2 - Main Transmission Sungear","slug":"ad-bell-206-125-amdt-2-main-transmission-sungear","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44277,"registerId":"commonwealth-F2006B04440-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/125 Amdt 2 - Main Transmission Sungear","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\nAD/BELL 206/125\n\nAmdt 2\n\n  \nMain Transmission Sungear 5/93\n\nApplicability: All model 206A, 206BII, 206BIII, 206L, 206L-1 and 206L-3 Bell helicopters and all model AB206A and AB206B Agusta Bell helicopters fitted with main transmission sungear P/N 206-040-662-101.\n\nRequirement: Unless already carried out, action in accordance with Bell helicopter Alert SB 206- 90-56 Revision A, 206L-90-69 Revision A or Agusta ApA I.L. AB206-91-002, as applicable.\n\nNote: FAA AD 92-06-12 Amdt 39-8192 and Italian RAI AD 93-040 refers.\n\nCompliance: At the next inspection of the sungear, or by 30 June 1993, whichever occurs first.\n\nNote: Agusta helicopters inspected in accordance with the above Bell ASB may be certified as complying with this directive.\n\nBackground: Certain sungears are to be retired from service due to manufacturing discrepancies which may lead to premature wear of the mating surfaces. This amendment raised in sequence to add the Agusta Bell series helicopter to the directive.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This is Amendment 2 to the original directive. The background explicitly states this amendment was raised 'in sequence to add the Agusta Bell series helicopter to the directive.' The scope has expanded from the original Bell-only coverage to include Agusta Bell models (AB206A and AB206B), though the underlying safety issue (defective sungear) remains the same."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (P/N = Part Number)","Single conditional applicability clause ('fitted with...')","No nested exceptions or cross-references to other legislation","Clear compliance deadline with simple alternative trigger ('whichever occurs first')","References to external technical documents (service bulletins) rather than complex legislative cross-referencing"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection or retirement of main transmission sungear P/N 206-040-662-101 on specified Bell 206 and Agusta Bell AB206 helicopter models, following Bell/Agusta service instructions. Issued because some sungears may have manufacturing defects causing premature wear and possible in‑flight loss of rotor power, compliance by 30 June 1993 (or at next scheduled inspection) is compulsory and legally required."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expanded the directive to add Agusta Bell series helicopters to the applicability; the Background states the amendment was raised to include Agusta Bell aircraft equipped with the affected sungear."},"complexity_factors":["Applicability covers multiple helicopter models but a single specific part number (Applicability).","Mandated action is adherence to manufacturer service bulletins rather than prescribing detailed technical steps (Requirement).","Compliance timing is dual: tied to the next inspection or a fixed calendar date, creating scheduling implications for operators (Compliance).","Cross-references to FAA and Italian ADs add regulatory coordination considerations (Note).","Technical basis is manufacturing discrepancies that may cause premature wear, requiring parts retirement decisions (Background).","Provision allowing Agusta inspections certified under Bell ASB creates an alternate compliance path (Note)."],"plain_english_summary":"This airworthiness directive orders owners/operators of specified Bell and Agusta Bell 206-series helicopters fitted with main transmission sungear P/N 206-040-662-101 to inspect—and remove from service if necessary—those sungears by the next sungear inspection or by 30 June 1993. (Requirement; Compliance) The directive requires following the listed Bell or Agusta service bulletins and imposes inspection and replacement costs on operators; CASA is enforcing the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-125-amdt-2-main-transmission-sungear","history":"/api/acts/ad-bell-206-125-amdt-2-main-transmission-sungear/history","analysis":"/api/acts/ad-bell-206-125-amdt-2-main-transmission-sungear/analysis","conflicts":"/api/acts/ad-bell-206-125-amdt-2-main-transmission-sungear/conflicts","importantCases":"/api/acts/ad-bell-206-125-amdt-2-main-transmission-sungear/important-cases","documents":"/api/acts/ad-bell-206-125-amdt-2-main-transmission-sungear/documents"}}