{"id":"F2006B04684","name":"AD/BELL 47/100 - Stabiliser Bar Damper Link Assembly","slug":"ad-bell-47-100-stabiliser-bar-damper-link-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44436,"registerId":"commonwealth-F2006B04684-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 47/100 - Stabiliser Bar Damper Link Assembly","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 47 (All Variants) Series Helicopters\n\nAD/BELL 47/100 Stabiliser Bar Damper Link Assembly 8/98\n\nApplicability: Model 47B, 47B-3, 47D, 47D-1, 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A, 47H-1, 47J,\n\n47J-2, 47J-2A, and 47K helicopters.\n\nRequirement: Remove the stabiliser bar damper link assemblies from the helicopter, install a safety washer kit, part number CA-047-96-022-1, and reinstall the stabiliser bar damper link assemblies onto the helicopter in accordance with Accomplishment Instructions in Bell Helicopter Textron, Inc. Alert Service Bulletin 47-96-22, dated 16 August 1996.\n\nNote: FAA AD 98-07-09 Amdt 39-10429 refers.\n\nCompliance: Unless already accomplished, within 100 hours time in service after 16 July 1998 or before 16 November 1998, whichever occurs first.\n\nThis airworthiness directive becomes effective on 16 July 1998.\n\nBackground: The FAA received two reports of incidents in which the bushings loosened and exited the damper link rod ends, allowing the damper link to slide over the retention bolt and separate from the stabiliser bar (in the first incident), and from the hydraulic damper (in the second incident). Failure of the damper link assembly could result in degraded control response and subsequent loss of control of the helicopter.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft models. It has not expanded beyond its original purpose of mandating a particular hardware modification."},"complexity_factors":["Single, specific mechanical modification required","Clear applicability list (21 helicopter models)","Single compliance deadline with straightforward 'whichever occurs first' logic","No defined terms section","No cross-references to other legislation (only references a manufacturer service bulletin and related FAA directive)","Background section provides plain-language explanation of safety risk"],"plain_english_summary":"This mandatory safety order affects operators of Bell 47 series helicopters (47B–47K) and requires replacing the stabiliser bar damper link assembly with an improved unit including a safety washer kit to prevent in‑flight loosening and potential loss of control.\n\nCompliance is required within 100 flight hours after 16 July 1998 or by 16 November 1998, whichever comes first."},"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"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope matches its stated purpose: it targets a specific failure mode on the enumerated Bell 47 variants and mandates a one-off retrofit (Requirement + Compliance). It does not extend applicability beyond the listed models nor add ongoing inspection requirements; it prescribes a narrowly defined corrective modification per the Bell Alert Service Bulletin."},"complexity_factors":["Narrow applicability: specific list of Bell 47 models (Applicability).","Single, defined mechanical action: remove link, install safety-washer kit P/N CA-047-96-022-1, and reinstall (Requirement).","Requires following an external technical document (Bell Alert Service Bulletin 47-96-22) for detailed steps (Requirement).","Fixed compliance window and flight-hour threshold creates scheduling and tracking demands for operators (Compliance).","Safety-critical consequence motivates mandatory compliance but does not impose recurrent inspections (Background).","Cross-reference to FAA AD 98-07-09 may affect record-keeping or international operators (Note).","Direct cost and downtime borne by aircraft owners/operators to obtain parts and perform the modification."],"plain_english_summary":"This directive requires owners/operators of the listed Bell 47 helicopter variants to remove each stabiliser-bar damper link, fit a specified safety-washer kit (P/N CA-047-96-022-1) and reinstall the link per Bell Alert Service Bulletin 47-96-22. Compliance is mandatory within 100 flight hours after 16 July 1998 or by 16 November 1998. The measure responds to reports that damper-link bushings can loosen and fall out, which can allow link separation and reduce control effectiveness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-47-100-stabiliser-bar-damper-link-assembly","history":"/api/acts/ad-bell-47-100-stabiliser-bar-damper-link-assembly/history","analysis":"/api/acts/ad-bell-47-100-stabiliser-bar-damper-link-assembly/analysis","conflicts":"/api/acts/ad-bell-47-100-stabiliser-bar-damper-link-assembly/conflicts","importantCases":"/api/acts/ad-bell-47-100-stabiliser-bar-damper-link-assembly/important-cases","documents":"/api/acts/ad-bell-47-100-stabiliser-bar-damper-link-assembly/documents"}}