{"id":"F2006B11338","name":"AD/MU-2/10 Amdt 1 - Flap Control System Flexible Shafts - Inspection","slug":"ad-mu-2-10-amdt-1-flap-control-system-flexible-shafts-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57219,"registerId":"commonwealth-F2006B11338-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/10 Amdt 1 - Flap Control System Flexible Shafts - Inspection","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\nAD/MU-2/10\n\nAmdt 1\n\n\nFlap Control System Flexible Shafts - Inspection 12/84\n\n \n\nApplicability: All models MU-2B aircraft referred to in the requirement document. Document: Mitsubishi MU-2 S.B. No. 162 Rev. A.\n\nCompliance: At intervals not exceeding 100 hours time in service after 28 February 1975.\n\n \n\nBackground:  This directive is amended to clarify the aircraft applicability and amend the revision status of the requirement document.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment is purely technical and clarifying. It does not expand the scope beyond the original safety intent — it merely clarifies which aircraft models are covered and updates the document reference to the current revision. The core safety requirement (inspect flexible shafts every 100 hours) remains unchanged from the original 1984 directive."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced ('time in service')","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1988","Simple conditional logic: single compliance trigger (100 hours time in service) with fixed start date","No nested exceptions or conditional exemptions","Single amendment purpose clearly stated in one sentence background"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\n- Requires owners and operators of **Mitsubishi MU-2B series aeroplanes** to inspect the **flap control system flexible shafts** (the mechanical linkages that help control the aircraft's flaps — the movable surfaces on the wings that help with takeoff and landing).\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains **any model of the Mitsubishi MU-2B aircraft**.\n\n**What must be done:**\n- The inspection must be carried out **every 100 hours of flight time** (measured as \"time in service\" — actual flying hours, not just calendar time).\n- This requirement started from **28 February 1975** onwards.\n\n**Why it matters:**\n- Flap control systems are critical for safe takeoffs and landings. If the flexible shafts fail, the pilot might lose control of the flaps, potentially leading to an accident.\n- This particular directive was **updated (Amendment 1)** to fix two things: clarify exactly which aircraft models are covered, and update the reference to the manufacturer's service bulletin to the latest revision (Rev. A).\n\n**The technical details:**\n- The inspection procedure itself is found in **Mitsubishi Service Bulletin No. 162, Revision A** — the aircraft manufacturer’s official maintenance instructions."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment changed the directive’s scope by clarifying which MU-2B aircraft are covered (linking applicability to the requirement document) and by updating the referenced requirement document to Mitsubishi MU-2 Service Bulletin No. 162 Rev. A. (Background; Applicability; Document)"},"complexity_factors":["Clear, single technical requirement (inspection every ≤100 hours) reduces procedural complexity.","Applicability ties to an external document (Mitsubishi MU-2 Service Bulletin No. 162 Rev. A), requiring users to obtain and interpret that document.","The wording “referred to in the requirement document” creates potential ambiguity about which specific airframes are covered without consulting the service bulletin.","Historical reference date (28 February 1975) requires correct interpretation of retrospective counting for compliance timelines.","No additional conditional exceptions, repair instructions, or alternative compliance paths are included in the text, limiting branching complexity."],"plain_english_summary":"What this directive does (mechanically)\n\n- Requires regular inspections of the flap control system flexible shafts on specified Mitsubishi MU-2B aeroplanes. (Compliance)\n- The inspection interval is “at intervals not exceeding 100 hours time in service” counting from 28 February 1975. (Compliance)\n- The directive applies to the MU-2B models referred to in the requirement document and directs operators to follow Mitsubishi Service Bulletin No. 162, Revision A. (Applicability; Document)\n\nOfficial rationale (as stated)\n\n- The directive was amended to clarify which aircraft are covered and to update the revision status of the requirement document. (Background)\n\nWho this affects and who pays\n\n- Aircraft operators/owners of the MU-2B models identified in the requirement document bear the cost and responsibility for carrying out inspections. (Applicability; Compliance)\n- Maintenance organisations and licensed technicians perform the inspections and keep service records.\n\nWhat decisions have been made and who decides\n\n- The Civil Aviation Safety Authority (CASA) issued this Airworthiness Directive making the inspection requirement mandatory for the specified aircraft. The technical procedures to be followed are those in Mitsubishi MU-2 Service Bulletin No. 162 Rev. A. (Document)\n\nHow behaviour changes mechanically\n\n- Operators must schedule and perform an inspection of the flap control flexible shafts every 100 hours of time in service or sooner, ensuring compliance from the reference date given (28 February 1975). Records must be kept to demonstrate compliance. (Compliance)\n\nCosts, incentives, and trade-offs\n\n- Direct costs: labour and any parts or repairs discovered during inspection. These are paid by individual operators or their insurers. (Compliance)\n- Incentive effects: frequent inspections increase maintenance workload and operating costs, which may incentivise operators to budget for more frequent maintenance or to prioritise inspections during existing maintenance visits to reduce downtime. (Compliance)\n- Trade-offs: the directive increases recurring maintenance cost and possible aircraft downtime in exchange for the expected reduction of risk from failure of the flap control flexible shafts. The document states the inspection requirement but does not quantify costs or risk reduction. (Compliance; Background)\n\nCompliance burden and implementation risks\n\n- Burden: operators must track flight hours against the 100‑hour interval and retain records showing inspections were completed per Mitsubishi SB No. 162 Rev. A. (Compliance; Document)\n- Implementation risks: the directive refers to aircraft “referred to in the requirement document,” which requires operators to obtain and interpret the service bulletin (SB No. 162 Rev. A) to confirm applicability. If the service bulletin is hard to obtain or ambiguous about model coverage, that could create uncertainty about who must comply. (Applicability; Document)\n- Availability of qualified maintenance personnel and spare parts could affect how quickly discovered defects are rectified and how long an aircraft is out of service. (Compliance)\n\nBureaucratic discretion\n\n- The AD fixes the mandatory inspection interval and the required service document; it leaves decisions about who performs the inspection, where it is done, and how inspections are scheduled to operators and maintenance organisations subject to regulatory oversight. (Compliance; Document)\n\nEffects on private choice and markets\n\n- The directive increases demand for maintenance services for the affected MU-2B fleet and may increase parts demand if inspections identify wear or damage. Operators may change scheduling or operational practices to accommodate the inspection interval. (Compliance)\n\nConcrete implementation pointers (from the text)\n\n- Verify whether a specific MU-2B airframe is listed in Mitsubishi MU-2 Service Bulletin No. 162 Rev. A to confirm applicability. (Applicability; Document)\n- Schedule inspections so no inspection interval exceeds 100 hours time in service after the reference date. (Compliance)\n\nSource citations\n\n- Applicability: “All models MU-2B aircraft referred to in the requirement document.” (Applicability)\n- Document: “Mitsubishi MU-2 S.B. No. 162 Rev. A.” (Document)\n- Compliance: “At intervals not exceeding 100 hours time in service after 28 February 1975.” (Compliance)\n- Background: “This directive is amended to clarify the aircraft applicability and amend the revision status of the requirement document.” (Background)\n"}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-10-amdt-1-flap-control-system-flexible-shafts-inspection","history":"/api/acts/ad-mu-2-10-amdt-1-flap-control-system-flexible-shafts-inspection/history","analysis":"/api/acts/ad-mu-2-10-amdt-1-flap-control-system-flexible-shafts-inspection/analysis","conflicts":"/api/acts/ad-mu-2-10-amdt-1-flap-control-system-flexible-shafts-inspection/conflicts","importantCases":"/api/acts/ad-mu-2-10-amdt-1-flap-control-system-flexible-shafts-inspection/important-cases","documents":"/api/acts/ad-mu-2-10-amdt-1-flap-control-system-flexible-shafts-inspection/documents"}}