{"id":"F2006B04559","name":"AD/BELL 212/28 Amdt 2 - Vertical Fin Forward Spar","slug":"ad-bell-212-28-amdt-2-vertical-fin-forward-spar","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114289,"registerId":"commonwealth-F2006B04559-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 212/28 Amdt 2 - Vertical Fin Forward Spar","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBell Helicopter Textron 212 Series Helicopters\n\nAD/BELL 212/28\n\nAmdt 2\n\n  \nVertical Fin Forward Spar 2/88\n\nApplicability: All Bell 212 helicopters which have P/N 212-030-447-001, or \\-101 spar caps in the vertical fin forward spar.\n\nRequirement: Inspect all \\-001 spar caps, and those \\-101 caps which are less than 0.190 inches thick when measured as shown in Bell ASB 212-86-38 using the inspection method described in Bell Technical Bulletin 212-81-50 Part 1.\n\nCompliance: At intervals not exceeding 120 hours component time in service. Inspection is not necessary once either of the following modifications has been accomplished:\n\n    Installation of a doubler in accordance with Part III of Bell Technical Bulletin 212-81-50;\n\n    b. Installation, in accordance with Bell ASB 212-86-38, of a new spar cap P/N 212- 030-447-101, providing it has a cap thickness of not less than 0.190 inches when measured as shown in Part I of Bell ASB 212-86-38, or has been reinforced in accordance with Part II of this same ASB.\n\nBackground: There have been numerous cracked \\-001 spar caps. A batch of the replacement \\-101 spar caps was made undersize. The static strength of the undersize caps is satisfactory if they are thicker than 0.155 inches, however, the fatigue strength of the caps less than 0.190 inches thick has not been demonstrated.\n\nThe content of AD/BELL 212/34 is now incorporated into this Directive because the two Directives were closely inter-related. AD/BELL 212/34 is now cancelled.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1915},"content_quality":"ok","complexity_score":5,"scope_assessment":{"changed":true,"description":"The amendment expands the scope to incorporate the content of the previously separate AD/BELL 212/34, which addressed closely related safety issues. AD/BELL 212/34 has been cancelled and its requirements consolidated into this directive."},"complexity_factors":["Multiple cross-references to external technical documents (Bell ASB 212-86-38, Bell Technical Bulletin 212-81-50 Parts I, II, and III)","Dual measurement thresholds with different engineering implications (0.155 inches for static strength vs 0.190 inches for fatigue strength)","Conditional applicability based on specific part numbers and physical measurements","Alternative compliance pathways (recurring inspections vs one-time modifications)","Technical aviation terminology (spar caps, doublers, component time in service)"],"plain_english_summary":"This directive requires owners/operators of Bell 212 helicopters with vertical fin forward spar caps having part numbers ending in -001 or -101 to inspect those caps for cracks and measure metal thickness every 120 flight hours. It responds to cracking of original -001 caps and some undersized -101 replacements whose thickness below 0.190\" raises fatigue concerns.\n\nCompliance is by continuing recurrent inspections or by installing a reinforcing doubler or properly thick replacement cap, after which the recurring inspections may cease; it also supersedes AD/BELL 212/34."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-212-28-amdt-2-vertical-fin-forward-spar","history":"/api/acts/ad-bell-212-28-amdt-2-vertical-fin-forward-spar/history","analysis":"/api/acts/ad-bell-212-28-amdt-2-vertical-fin-forward-spar/analysis","conflicts":"/api/acts/ad-bell-212-28-amdt-2-vertical-fin-forward-spar/conflicts","importantCases":"/api/acts/ad-bell-212-28-amdt-2-vertical-fin-forward-spar/important-cases","documents":"/api/acts/ad-bell-212-28-amdt-2-vertical-fin-forward-spar/documents"}}