{"id":"F2006B11356","name":"AD/MU-2/27 - Engine Control System Cable Pulleys - Replacement","slug":"ad-mu-2-27-engine-control-system-cable-pulleys-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57252,"registerId":"commonwealth-F2006B11356-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/27 - Engine Control System Cable Pulleys - Replacement","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nMitsubishi MU-2 Series Aeroplanes\n\nAD/MU-2/27 Engine Control System Cable Pulleys \\- Replacement 12/83\n\nApplicability: MU-2B-25/-26A If any MS20219-3 pulleys on the engine control system have been replaced. S/N 313SA & 32ISA MU-2B-26/-26A/-40. S/N 348SA thru 448SA. MU-\n\n2B-35/-36A/-60 If any MS20219-3 pulleys on the engine control system have been replaced. S/N 652SA, 661SA, 697SA thru 710SA MU-2B-36A/-60 S/N 711SA thru 799SA and 1501SA thru 1529SA.\n\nDocument: Mitsubishi SB No. 035/27-006\n\nCompliance: Unless already accomplished within 100 hrs time in service after 30 November 1983.\n\nBackground: The manufacturer advises that cracks have occurred in a batch of engine control pulleys’ manufactured in 1975 by the Tansey Co., or Arvan Inc. Regardless of condition, these pulleys must be replaced.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2668},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope addressing the specific safety defect identified in 1975-manufactured pulleys. No evidence of expansion into broader aircraft systems or unrelated components."},"complexity_factors":["Conditional applicability requiring verification of specific aircraft serial numbers and maintenance history","Reference to external technical document (Mitsubishi Service Bulletin No. 035/27-006)","Specific identification requirements for defective parts (part number MS20219-3, manufacturers Tansey Co. or Arvan Inc., 1975 production batch)"],"plain_english_summary":"This directive requires owners/operators of certain Mitsubishi MU-2 aircraft to replace engine control pulleys (part MS20219-3) manufactured in 1975 by Tansey Co. or Arvan Inc. on specified MU-2 variants. Replacement must be done within 100 flight hours after 30 November 1983. It matters because the pulleys can crack, risking cable failure and loss of engine control, creating a serious safety hazard."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-27-engine-control-system-cable-pulleys-replacement","history":"/api/acts/ad-mu-2-27-engine-control-system-cable-pulleys-replacement/history","analysis":"/api/acts/ad-mu-2-27-engine-control-system-cable-pulleys-replacement/analysis","conflicts":"/api/acts/ad-mu-2-27-engine-control-system-cable-pulleys-replacement/conflicts","importantCases":"/api/acts/ad-mu-2-27-engine-control-system-cable-pulleys-replacement/important-cases","documents":"/api/acts/ad-mu-2-27-engine-control-system-cable-pulleys-replacement/documents"}}