{"id":"F2006B04409","name":"AD/BELL 205/71 - Main Rotor Tension-Torsion Strap","slug":"ad-bell-205-71-main-rotor-tension-torsion-strap","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44234,"registerId":"commonwealth-F2006B04409-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (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 205 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/BELL 205/71 Main Rotor Tension-Torsio","sectionType":"part","heading":"AD/BELL 205/71 Main Rotor Tension-Torsion Strap 1/2003","content":"# AD/BELL 205/71 Main Rotor Tension-Torsion Strap 1/2003\n\nDM\n\nApplicability: Model 205A, 205A-1, and 205B helicopters, with main rotor tension-torsion (TT) strap, part number 204-012-122-1, \\-5, or 214-010-179-1, installed.\n\nRequirement: Remove and replace any TT strap with 1,200 hours total time in service or 24 or more months since initial installation on any helicopter, whichever occurs first.\n\nThis Directive revises the Limitations section of the maintenance manual by establishing a life limit for TT straps, part number 204-012-122-1, \\-5, or 214-010- 179-1, of 1,200 hours total time in service or 24 months since initial installation on any helicopter, whichever occurs first.\n\nNote: FAA AD 2002-22-14 Amdt 39-12941 refers.\n\nCompliance: Before further flight after 27 November 2002, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 27 November 2002.\n\nBackground: The original FAA AD requirement (AD 80-17-09) was prompted by an offshore accident of a Model 212 helicopter in which a TT strap reportedly failed in- flight after 2,140 hours total time in service, with resulting loss of the main rotor blade. This Directive restates the requirements AD 80-17-09, establishes a life limit for TT straps by revising the Limitations section of the maintenance manual, and adds Models 205A and 205B helicopters to the applicability. The actions required by this\n\nDirective are intended to prevent failure of a TT strap, loss of a main rotor blade, and subsequent loss of control of the helicopter.\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 22 November 2002\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 27 November 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This Directive restates the earlier FAA AD (AD 80-17-09) and expands applicability by adding Models 205A and 205B to the affected types, while establishing a life limit of 1,200 hours or 24 months for the specified TT strap part numbers and revising the maintenance manual accordingly (Background; Requirement)."},"complexity_factors":["Narrow applicability to specific Bell 205 models and defined part numbers reduces breadth of affected parties (Applicability).","Single, clear required action—remove and replace at a fixed life limit—lowers procedural ambiguity (Requirement).","Immediate compliance timing ('before further flight after 27 November 2002') raises operational urgency and potential grounding costs (Compliance).","Mandated revision of the maintenance manual creates an administrative change for maintenance organisations (Requirement).","Safety-critical technical consequence (loss of main rotor blade) increases enforcement attention and recordkeeping demands (Background).","Cross-reference to an FAA AD adds an external regulatory source to consider (Note)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Bell 205A, 205A-1 and 205B helicopters with specified main rotor tension‑torsion (TT) straps to remove and replace any such strap that has reached 1,200 hours total time‑in‑service or 24 months since initial installation, whichever comes first, and to insert that life limit into the maintenance manual (Requirement; Compliance). The CASA delegate set the rule to prevent TT strap failure and loss of a main rotor blade; operators pay for replacements, must track strap time/age, and must comply before further flight (Background; Compliance)."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The legislation maintains its original narrow scope as a safety-critical maintenance directive for specific helicopter components. While it expands applicability from the original FAA directive (adding Models 205A and 205B to the original Model 212 coverage), this represents a logical extension of the same safety purpose rather than scope creep. The core intent — preventing TT strap failures through mandatory replacement intervals — remains unchanged from the original 1980 FAA directive."},"complexity_factors":["Single, clearly defined applicability section covering 3 specific helicopter models and 3 specific part numbers","Straightforward binary compliance trigger (1,200 hours OR 24 months, whichever first)","No nested exceptions or conditional logic — one universal requirement","Minimal cross-referencing (only a note referencing the related FAA AD for context)","Short document (approximately 250 words) with clear section headers","Only one defined term implied ('total time in service' — standard aviation term)"],"plain_english_summary":"This CASA Airworthiness Directive mandates that owners/operators of Bell 205 series helicopters replace specific main rotor tension‑torsion (TT) straps when they reach 1,200 flight hours or 24 months since first installation, whichever occurs first. It enforces a strict life limit to prevent TT strap failure—an event that has previously caused a fatal in‑flight rotor separation—and required compliance before any flight after 27 November 2002."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-205-71-main-rotor-tension-torsion-strap","history":"/api/acts/ad-bell-205-71-main-rotor-tension-torsion-strap/history","analysis":"/api/acts/ad-bell-205-71-main-rotor-tension-torsion-strap/analysis","conflicts":"/api/acts/ad-bell-205-71-main-rotor-tension-torsion-strap/conflicts","importantCases":"/api/acts/ad-bell-205-71-main-rotor-tension-torsion-strap/important-cases","documents":"/api/acts/ad-bell-205-71-main-rotor-tension-torsion-strap/documents"}}