{"id":"F2006B11392","name":"AD/MU-2/62 - Landing Gear Actuating Mechanism","slug":"ad-mu-2-62-landing-gear-actuating-mechanism","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57293,"registerId":"commonwealth-F2006B11392-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/62 - Landing Gear Actuating Mechanism","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-2/62 Landing Gear Actuating Mechanism 2/98\n\nApplicability: Models MU-2B, MU-2B-10, \\-15, \\-20, \\-25, and \\-26 aircraft with serial numbers 008\n\nthrough 347, except serial numbers 313 and 321; and Models MU-2B-30, \\-35, and \\-36\n\naircraft with serial numbers 501 through 696, except serial numbers 652 and 661.\n\nRequirement: Modify the bearing box(es) in the landing gear actuating mechanism in accordance with Mitsubishi MU-2 Service Bulletin 230.\n\nNote: JCAB AD TCD-4684-97 refers.\n\nCompliance: Unless already accomplished, within 100 hours time in service after 29 January 1998.\n\nThis airworthiness directive becomes effective on 29 January 1998.\n\nBackground: The JCAB requires modification action in order to prevent the possible inability to completely extend the landing gear.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard single-issue airworthiness directive addressing a specific mechanical defect in a specific aircraft type. The scope remains tightly focused on the landing gear bearing box modification as originally intended."},"complexity_factors":["Very short document (under 200 words)","Only 1 substantive requirement (modify bearing boxes per Service Bulletin 230)","Simple applicability clause using serial number ranges with 4 explicit exceptions","Single compliance deadline (100 hours time in service)","No defined terms section, no cross-references to other legislation beyond a note about a Japanese authority document","No conditional logic or nested exceptions"],"plain_english_summary":"This is a **safety order for specific Mitsubishi aeroplanes** that fixes a dangerous problem with the landing gear.\n\n**What it does:**\n- Requires owners/operators of certain Mitsubishi MU-2 aircraft to modify the **bearing boxes** (mechanical components that help the landing gear move) in the landing gear system.\n- The fix must follow **Mitsubishi Service Bulletin 230** — essentially the manufacturer's official repair instructions.\n\n**Who it affects:**\n- Owners and operators of specific Mitsubishi MU-2B series aircraft (models -10 through -36) with particular serial numbers.\n- **Not all MU-2s** — specific serial numbers are excluded (313, 321, 652, and 661).\n\n**Why it matters:**\n- **Safety critical:** Without this fix, the landing gear might not fully extend when the pilot tries to lower it. This could cause a crash during landing.\n- **Deadline:** The work must be done within **100 hours of flying time** after 29 January 1998 (unless already fixed).\n\n**What is this document?**\nThis is an **Airworthiness Directive (AD)** — a legally binding safety order issued by the Civil Aviation Safety Authority (CASA). ADs are like \"recall notices\" for aircraft. They force operators to fix known dangerous defects."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s scope is consistent with the stated original intent. The Background explains the safety concern (preventing possible inability to extend landing gear) and the Requirement limits action to modifying bearing box(es) per Mitsubishi Service Bulletin 230 on the specified MU-2 models and serial numbers. The Applicability, Requirement and Compliance provisions together define a narrow, targeted scope aligned with that intent. (Applicability; Requirement; Compliance; Background)"},"complexity_factors":["Technical specificity: mandates a specific mechanical change (bearing box modification) and references an external manufacturer service bulletin (Requirement).","Targeted applicability: applies only to particular MU-2 models and a defined set of serial numbers with explicit exclusions (Applicability).","Compliance timing: a short, fixed compliance window (100 hours time in service after 29 January 1998) creates scheduling pressure (Compliance).","Cross-jurisdiction reference: references a foreign regulator’s AD (JCAB), adding a coordination aspect (Note).","Operational implementation: modification requires technical work by maintenance providers and record-keeping to show compliance (Requirement; Compliance)."],"plain_english_summary":"The directive requires owners/operators of specified Mitsubishi MU-2 serial-numbered models to have the landing-gear bearing box(es) modified in accordance with Mitsubishi Service Bulletin 230, with compliance within 100 hours TIS after 29 January 1998 (effective that date).  \n\nIt responds to a JCAB finding that the change prevents possible inability to fully extend the landing gear; the cost, downtime and arrangement of the work fall to aircraft owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-62-landing-gear-actuating-mechanism","history":"/api/acts/ad-mu-2-62-landing-gear-actuating-mechanism/history","analysis":"/api/acts/ad-mu-2-62-landing-gear-actuating-mechanism/analysis","conflicts":"/api/acts/ad-mu-2-62-landing-gear-actuating-mechanism/conflicts","importantCases":"/api/acts/ad-mu-2-62-landing-gear-actuating-mechanism/important-cases","documents":"/api/acts/ad-mu-2-62-landing-gear-actuating-mechanism/documents"}}