{"id":"F2006B11354","name":"AD/MU-2/25 Amdt 2 - Flap Control System Torque Tube Assembly Joint","slug":"ad-mu-2-25-amdt-2-flap-control-system-torque-tube-assembly-joint","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57248,"registerId":"commonwealth-F2006B11354-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/25 Amdt 2 - Flap Control System Torque Tube Assembly Joint","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-2/25\n\nAmdt 2\n\n  \nFlap Control System Torque Tube Assembly Joint 10/90\n\nApplicability: All models.\n\nRequirement: Action in accordance with Mitsubishi SB No 189A or SB No 067/27-008 as applicable by serial number.\n\nNote: Japan Civil Aviation Bureau AD No TCD-2252-1-87 refers.\n\nCompliance: Initially inspect prior to exceeding 4000 hours component time in service or within 100 hours component time in service after 1 November 1990, whichever occurs later. Repeat the inspections at intervals not exceeding 100 hours component time in service.\n\nNote: Modification in accordance with the applicable Requirement document constitutes terminating action for this Directive.\n\nBackground: Amendment 1 extended the repeat inspection requirements, and introduced a new terminating action for the inspections.\n\nAmendment 2 introduces SB 067/27-008 which extends the inspection requirements to include all remaining serial numbers, and includes terminating action acceptable for those serial numbers.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original directive (Amendment 1) applied to specific serial numbers. Amendment 2 expands the scope to cover 'all remaining serial numbers' of the MU-2 series, effectively making this a fleet-wide mandate rather than a limited subset. The amendment also introduces new terminating action for the newly covered serial numbers."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined compliance pathways based on serial number","Single mechanical component addressed","Clear terminating action specified","Minimal cross-referencing (only to Mitsubishi service bulletins and one Japanese aviation authority document)","Simple temporal compliance structure (hours-based intervals with one fixed date threshold)"],"plain_english_summary":"This AD requires owners, operators and maintenance engineers of Mitsubishi MU-2 aeroplanes to inspect the flap-control torque-tube joint for wear or damage, initially before the part reaches 4,000 hours' service or within 100 hours' flight after 1 November 1990 (whichever is later), and every 100 hours thereafter, using the applicable Mitsubishi service bulletin. Modifying the aircraft per that bulletin terminates the inspections. This second amendment extends the requirement to all remaining serial numbers."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 2 expanded the directive's scope by introducing Service Bulletin 067/27-008 to cover all remaining serial numbers and by providing an acceptable terminating modification for those serial numbers (Background: 'Amendment 2 introduces SB 067/27-008 which extends the inspection requirements to include all remaining serial numbers, and includes terminating action acceptable for those serial numbers')."},"complexity_factors":["Universal applicability to 'All models' increases the population of affected aircraft (Applicability).","Requirement ties compliance to two different manufacturer Service Bulletins, selected by serial number (Requirement: Mitsubishi SB No 189A or SB No 067/27-008).","Time-in-service tracking is required (initial inspection before 4,000 component hours or within 100 hours after 1 Nov 1990; repeat every 100 component hours), creating ongoing maintenance scheduling and recordkeeping burden (Compliance).","A modification stated in the Service Bulletin constitutes terminating action, creating a binary compliance path: continual inspection or one-off modification (Note: 'Modification ... constitutes terminating action').","Amendment history changed the affected serial-number set and introduced new acceptable terminating action for those serial numbers, so operators must check serial-number applicability against the updated SB (Background: Amendment 2 introduces SB 067/27-008 and extends requirements).","Operational burden concentrates on aircraft owners/operators and maintenance providers who must fund and perform inspections or modifications (implicit in Requirement/Compliance provisions)."],"plain_english_summary":"This airworthiness directive requires operators of Mitsubishi MU-2 aeroplanes to inspect the flap control system torque tube assembly joint in line with Mitsubishi Service Bulletin No. 189A or No. 067/27-008 and to repeat inspections at 100‑hour component-time intervals until a qualifying modification is carried out. It applies to all MU-2 models and sets an initial inspection deadline (before exceeding 4,000 component hours or within 100 hours after 1 November 1990)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-25-amdt-2-flap-control-system-torque-tube-assembly-joint","history":"/api/acts/ad-mu-2-25-amdt-2-flap-control-system-torque-tube-assembly-joint/history","analysis":"/api/acts/ad-mu-2-25-amdt-2-flap-control-system-torque-tube-assembly-joint/analysis","conflicts":"/api/acts/ad-mu-2-25-amdt-2-flap-control-system-torque-tube-assembly-joint/conflicts","importantCases":"/api/acts/ad-mu-2-25-amdt-2-flap-control-system-torque-tube-assembly-joint/important-cases","documents":"/api/acts/ad-mu-2-25-amdt-2-flap-control-system-torque-tube-assembly-joint/documents"}}