{"id":"F2006B04417","name":"AD/BELL 206/103 - Tension/Torsion Strap Fitting","slug":"ad-bell-206-103-tension-torsion-strap-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44242,"registerId":"commonwealth-F2006B04417-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/103 - Tension/Torsion Strap Fitting","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\nAD/BELL 206/103 Tension/Torsion Strap Fitting 8/86\n\nApplicability: All Bell 206B III Series Helicopters fitted with tension/torsion strap sleeve fitting P/No. 206-011-150-101.\n\nRequirement: For aircraft which have had the tension/torsion strap assembly disassembled since new, inspect the strap fitting (P/No 206-011- 150-101) to static stop (P/N. 206-011- 121-103) alignment. The strap fitting (P/No. 206-011-150-101) has 3 flats adjacent to each other: the centre and smallest is the correct flat for mating with the static stop.\n\nNote: With the blade grip in the zero pitch position, the wrong flat aligns with the stop, thus positioning the T/T strap so that it increases twist with pitch increase instead of vice versa.\n\nCompliance: Inspect within 100 hours time in service after 31 August 1986 and thereafter anytime the tension/torsion strap assembly is disassembled until P/No. 206-011-150-101 fitting is replaced with P/No. 206-011-150-105 fitting.\n\nBackground: If the strap fitting P/NO. 206-011-150-101 is refitted incorrectly and should the aircraft suffer an engine failure, full collective pitch cannot be achieved.\n\nThe strap fitting P/No. 206-011-150-101 is fitted by the manufacturer and is not available as a replacement part: P/No. 206-011-150-105 is supplied. The problem does not occur when the latter Part Number is fitted.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2162},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope addressing a specific mechanical defect in the rotor assembly of Bell 206B III helicopters. There is no expansion beyond the original safety-critical hardware alignment issue."},"complexity_factors":["Technical aviation terminology without definitions (e.g., 'static stop', 'collective pitch', 'time in service')","Precise part number identification required for compliance (distinguishing P/No. 206-011-150-101 from 206-011-150-105)","Dual compliance triggers combining calendar date and accumulated flight hours","Conditional applicability limited to aircraft that have been disassembled since manufacture"],"plain_english_summary":"A mandatory safety inspection for Bell 206B III helicopters fitted with tension/torsion strap fitting P/N 206-011-150-101 requires checking that the fitting’s center (smallest) flat is aligned with the static stop. If assembled on the wrong flat the rotor blade twists the wrong way, preventing full collective in an engine-out emergency and risking a crash. Inspect within 100 flight hours after Aug 31, 1986 and each time the assembly is disassembled; continue until replaced by P/N 206-011-150-105."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-103-tension-torsion-strap-fitting","history":"/api/acts/ad-bell-206-103-tension-torsion-strap-fitting/history","analysis":"/api/acts/ad-bell-206-103-tension-torsion-strap-fitting/analysis","conflicts":"/api/acts/ad-bell-206-103-tension-torsion-strap-fitting/conflicts","importantCases":"/api/acts/ad-bell-206-103-tension-torsion-strap-fitting/important-cases","documents":"/api/acts/ad-bell-206-103-tension-torsion-strap-fitting/documents"}}