{"id":"F2006B04539","name":"AD/BELL 206/9 Amdt 1 - Tail Rotor Control Tube - Inspection","slug":"ad-bell-206-9-amdt-1-tail-rotor-control-tube-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114259,"registerId":"commonwealth-F2006B04539-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/9 Amdt 1 - Tail Rotor Control Tube - Inspection","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 206/9\n\nAmdt 1\n\n  \nTail Rotor Control Tube \\- Inspection 4/69\n\nApplicability: All model 206A and AB-206A.\n\nRequirement: 1. Remove the control tube P/N 206-001-021-9 from the aft end of the tail boom and inspect for wear at the five areas where the tube contacts the fair leads.\n\n    2. To determine the amount of wear at each location proceed as follows:\n\n    (a) Measure the diameter of the tube just forward and aft of the worn area. Make all measurements in the same plane.\n\n    (b) Measure the tube diameter in the worn area and compare with the measurements taken in (a) above.\n\n    (c) If the wear does not extend through the tube finish, reinstall the tube. If wear in any area extends through the dry film lube (black colour) and the anodize (brown colour) but is not in excess of 0.006 inch on one side, the tube may be rotated 180 degrees and reinstalled. If the wear extends completely around the tube and does not exceed 0.012 inch, reinstall the tube assembly end for end.\n\n    (d) If wear is found in any area in excess of 0.012 inch, remove the tube assembly from service.\n\nCompliance: At intervals not exceeding 300 hours time in service after 1 September 1971\\. Background: AD/Agusta 206/4A equivalent.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2521},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of ensuring airworthiness of tail rotor control tubes through periodic inspection. It updates the specific inspection procedures and wear tolerances without expanding beyond the original safety intent."},"complexity_factors":["Four distinct conditional scenarios based on wear measurements requiring different actions","Precise engineering tolerances (0.006 inch and 0.012 inch limits)","Specific part number and model applicability restrictions","Time-based compliance interval (300 hours time in service)"],"plain_english_summary":"Operators of Bell 206A and Agusta Bell AB‑206A helicopters must have mechanics inspect the tail rotor control tube every 300 flight hours for wear at five contact points, measuring worn diameters versus unworn areas. Depending on measured wear, the tube may be reinstalled, rotated, flipped, or removed from service if wear exceeds safety limits. This rule protects against tail‑rotor control failure, a serious flight‑safety hazard."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-9-amdt-1-tail-rotor-control-tube-inspection","history":"/api/acts/ad-bell-206-9-amdt-1-tail-rotor-control-tube-inspection/history","analysis":"/api/acts/ad-bell-206-9-amdt-1-tail-rotor-control-tube-inspection/analysis","conflicts":"/api/acts/ad-bell-206-9-amdt-1-tail-rotor-control-tube-inspection/conflicts","importantCases":"/api/acts/ad-bell-206-9-amdt-1-tail-rotor-control-tube-inspection/important-cases","documents":"/api/acts/ad-bell-206-9-amdt-1-tail-rotor-control-tube-inspection/documents"}}