{"id":"F2006B04598","name":"AD/BELL 212/65 - Main Rotor Tension-Torsion Straps - 2","slug":"ad-bell-212-65-main-rotor-tension-torsion-straps-2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44345,"registerId":"commonwealth-F2006B04598-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\n![](image.001.png)\n\n![](image.001.png)  \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 212 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/BELL 212/65 Main Rotor Tension-Torsio","sectionType":"part","heading":"AD/BELL 212/65 Main Rotor Tension-Torsion Straps - 2 1/2003","content":"# AD/BELL 212/65 Main Rotor Tension-Torsion Straps \\- 2 1/2003\n\nDM\n\nApplicability: Model 212 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 and establishes a life limit for TT straps by revising the Limitations section of the maintenance manual. The actions required by this Directive 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![](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 21 November 2002\n\n![](image.001.png)  \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":"The Directive restates the earlier AD 80-17-09 but adds a definitive life limit for the specified TT straps (1,200 hours or 24 months) and requires the maintenance manual Limitations section to reflect that limit. In effect the scope moves from restating previous requirements to mandating a fixed replacement interval for the listed part numbers (Requirement; Background)."},"complexity_factors":["Narrow applicability: only Model 212 helicopters with TT straps PN 204-012-122-1, -5, or 214-010-179-1 are affected (Applicability).","Clear dual metric life limit: replacement required at 1,200 hours total time-in-service or 24 months since initial installation, whichever occurs first (Requirement).","Immediate compliance deadline: must be complied with before further flight after 27 November 2002, creating an urgent operational requirement (Compliance).","Amendment to maintenance documentation: revises the Limitations section of the maintenance manual to establish the life limit, requiring manual update and ongoing adherence (Requirement/Background).","Enforcement basis: issued by CASA under subregulation 39.1(1) of CAR 1998, reflecting regulatory discretion to mandate corrective action (opening paragraph).","Operational burdens on operators: requires removal and replacement (cost of parts and labour) and accurate tracking of total time-in-service and installation dates to demonstrate compliance (Requirement).","Link to prior FAA action: references FAA AD 2002-22-14 and restates AD 80-17-09, indicating regulatory harmonisation and reliance on prior incident history (Note/Background)."],"plain_english_summary":"This directive requires Bell 212 helicopters with specific main rotor tension-torsion (TT) straps (PN 204-012-122-1, -5, or 214-010-179-1) to have any strap removed and replaced once it reaches 1,200 flight hours or 24 months since installation, whichever comes first. It adds that life limit to the maintenance manual and must be complied with before further flight after 27 November 2002. Operators/owners bear the cost of replacement, downtime and record-keeping."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: establishing a life limit for specific helicopter components to prevent mechanical failure. It has not expanded beyond this safety-critical maintenance requirement."},"complexity_factors":["Very short document (approximately 250 words)","Only 3 defined part numbers in the applicability section","Single, clear requirement with no nested conditions or exceptions","No cross-references to other legislation (only a non-binding note referencing related FAA directive)","Simple compliance trigger: 'before further flight after [date]'","Straightforward 'whichever occurs first' temporal logic"],"plain_english_summary":"This CASA safety order requires owners/operators of Bell 212 helicopters fitted with specified main-rotor tension‑torsion straps to treat those straps as life‑limited parts and replace them at 1,200 flight hours or 24 months from installation, whichever comes first. Prompted by a fatal offshore accident where a strap failed after 2,140 hours, the rule is a preventive safety measure and had to be complied with before any flight after 27 November 2002."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-212-65-main-rotor-tension-torsion-straps-2","history":"/api/acts/ad-bell-212-65-main-rotor-tension-torsion-straps-2/history","analysis":"/api/acts/ad-bell-212-65-main-rotor-tension-torsion-straps-2/analysis","conflicts":"/api/acts/ad-bell-212-65-main-rotor-tension-torsion-straps-2/conflicts","importantCases":"/api/acts/ad-bell-212-65-main-rotor-tension-torsion-straps-2/important-cases","documents":"/api/acts/ad-bell-212-65-main-rotor-tension-torsion-straps-2/documents"}}