{"id":"F2006B04568","name":"AD/BELL 212/37 Amdt 1 - Main Rotor Pillow Block","slug":"ad-bell-212-37-amdt-1-main-rotor-pillow-block","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114298,"registerId":"commonwealth-F2006B04568-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 212/37 Amdt 1 - Main Rotor Pillow Block","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 212 Series Helicopters\n\nAD/BELL 212/37\n\nAmdt 1\n\n  \nMain Rotor Pillow Block 10/87\n\nApplicability: All model 212 helicopters S/Nos 30501 to 31285, 32101 to 32142 and 32201 to\n\n32262.\n\nRequirement: Action in accordance with Bell Alert SB No 212-87-43 Rev “A”.\n\nCompliance: Part I of Requirement Document: Within 25 hours time in service after 15 May 1987 and thereafter at intervals not exceeding 25 hours time in service until modified in accordance with Part II of the Requirement document.\n\nPart II of Requirement Document: Within 300 hours time in service after 15 May 1987 or before 30 June 1987 whichever occurs first.\n\nBackground: The manufacturer has determined that a contributing factor in the recent failure of a pillow block was loss of torque on the retaining nut.\n\nAmendment 1 extends helicopter serial number applicability.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2261},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the applicability to include additional helicopter serial number ranges (32101–32142 and 32201–32262), broadening the directive beyond the original 30501–31285 range to capture more aircraft requiring the safety modification."},"complexity_factors":["Very short instrument (under 200 words) with single technical purpose","Clear, unambiguous compliance deadlines with minimal conditional logic","No interpretation section, definitions, or nested exceptions","External reference to manufacturer bulletin without complex statutory integration"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners/operators of Bell 212 helicopters in specified serial ranges to urgently inspect and permanently fix a defect in the main-rotor pillow block. \n\nThe rule—starting with interim inspections then a manufacturer's permanent modification—addresses a loose retaining nut that could cause pillow-block failure and possible main-rotor separation; the amendment expands coverage to additional serial numbers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-212-37-amdt-1-main-rotor-pillow-block","history":"/api/acts/ad-bell-212-37-amdt-1-main-rotor-pillow-block/history","analysis":"/api/acts/ad-bell-212-37-amdt-1-main-rotor-pillow-block/analysis","conflicts":"/api/acts/ad-bell-212-37-amdt-1-main-rotor-pillow-block/conflicts","importantCases":"/api/acts/ad-bell-212-37-amdt-1-main-rotor-pillow-block/important-cases","documents":"/api/acts/ad-bell-212-37-amdt-1-main-rotor-pillow-block/documents"}}