{"id":"F2006B11363","name":"AD/MU-2/33 - Rudder and Elevator Trim Idler Installation - Modification","slug":"ad-mu-2-33-rudder-and-elevator-trim-idler-installation-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57262,"registerId":"commonwealth-F2006B11363-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/33 - Rudder and Elevator Trim Idler Installation - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Mitsubishi MU-2 Series Aeroplanes\n\n \n\n# AD/MU-2/33 Rudder and Elevator Trim Idler Installation - Modification\n\nApplicability: All models MU-2B-40 with S/Nos. 420SA, 430SA to 435SA.\n\n \n\nMU-2B-60 with S/Nos. 748SA, 758SA, 779SA to 798SA, except 789SA.\n\n# 7/84\n\n \n\nDocument: Mitsubishi Aircraft International SBs No. SB022/22-002 or SB026/22-003 Rev. B.\n\n \n\nCompliance: Within 100 hours time in service after 31 July 1984 or at the next scheduled inspection for Maintenance Release issue after 30 June 1984 whichever is the later.\n\n \n\nBackground: Rudder and elevator trim systems pulley malfunctions and chain misalignment problems have been experienced. Failure to incorporate the intent of the requirement documents may result in binding of the trim chains leading to ineffective trim, yaw damper and autopilot operation.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2299},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains a precise, targeted scope limited to specific aircraft models with identified safety defects in their trim systems. It does not expand beyond the original safety purpose of addressing rudder and elevator trim pulley malfunctions and chain alignment issues."},"complexity_factors":["Applicability determined by specific aircraft serial number ranges rather than broad model categories","Compliance requires reference to external technical documents (manufacturer service bulletins) not reproduced in the directive","Dual compliance timeframe requiring calculation based on both flight hours ('time in service') and calendar dates","Technical aviation terminology ('Maintenance Release', 'yaw damper', 'idler') requires specialized domain knowledge to interpret fully"],"plain_english_summary":"A mandatory safety order requires owners/operators of certain Mitsubishi MU-2B-40 and MU-2B-60 aircraft (specific serial numbers) to modify rudder and elevator trim idler hardware per Mitsubishi service bulletins SB022/22-002 or SB026/22-003 Rev B. The change prevents idler-related trim chain binding that can disable trim, yaw damper, and autopilot, creating a loss-of-control risk. Compliance was required by the stated 1984 flight-hour/inspection deadlines."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-33-rudder-and-elevator-trim-idler-installation-modification","history":"/api/acts/ad-mu-2-33-rudder-and-elevator-trim-idler-installation-modification/history","analysis":"/api/acts/ad-mu-2-33-rudder-and-elevator-trim-idler-installation-modification/analysis","conflicts":"/api/acts/ad-mu-2-33-rudder-and-elevator-trim-idler-installation-modification/conflicts","importantCases":"/api/acts/ad-mu-2-33-rudder-and-elevator-trim-idler-installation-modification/important-cases","documents":"/api/acts/ad-mu-2-33-rudder-and-elevator-trim-idler-installation-modification/documents"}}