{"id":"F2006B11349","name":"AD/MU-2/20 - Engine Nacelle Upper Door Latch Link - Replacement","slug":"ad-mu-2-20-engine-nacelle-upper-door-latch-link-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57238,"registerId":"commonwealth-F2006B11349-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/20 - Engine Nacelle Upper Door Latch Link - Replacement","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-2/20 Engine Nacelle Upper Door Latch Link - Replacement\n\nApplicability: All models with S/Nos. prior to 697. Document:  Mitsubishi SB No. 180.\n\nCompliance: Before 1 August 1978.\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\n \n\n \n\n \n\n\n3/78\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused on one specific mechanical component on one aircraft type. It has not expanded beyond its original purpose of mandating a parts replacement for safety reasons."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory content","No defined terms section — all terms are plain English or standard aviation terminology","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Regulations 1998, Part 39)","Single, unambiguous compliance requirement with a fixed deadline","No conditional logic, exceptions, or nested provisions","References only one external technical document (Mitsubishi SB No. 180) for implementation details"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\n**What it does:**\nOrders owners and operators of specific Mitsubishi MU-2 aircraft to replace a part called the \"Engine Nacelle Upper Door Latch Link\" — a component that helps secure the engine cover (nacelle) on the plane.\n\n**Who it affects:**\n- Owners and operators of **Mitsubishi MU-2 series aeroplanes**\n- Specifically, **all models with serial numbers prior to 697** (older aircraft in this series)\n\n**What must be done:**\n- Follow **Mitsubishi Service Bulletin No. 180** (the manufacturer's official repair instructions)\n- Complete the replacement **before 1 August 1978**\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. If you don't comply, you cannot legally fly the aircraft. This particular directive addresses a potential mechanical defect that could affect engine cover security — a serious flight safety issue. The deadline has long passed, so this is now historical, but it remains part of the regulatory record for these aircraft."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope is explicit and limited: it applies only to MU-2 aeroplanes with serial numbers prior to 697 and mandates replacement of the engine nacelle upper door latch link per Mitsubishi SB No. 180, to be completed by 1 August 1978. Nothing in the text indicates an expansion or narrowing of that scope from the directive’s stated requirement."},"complexity_factors":["Narrow, specific applicability (all MU-2 with S/Nos prior to 697) reduces legal and operational complexity (Applicability).","Single, time-bound action (replace latch link) with a fixed compliance date simplifies obligations (Compliance: before 1 August 1978).","Reliance on an external technical document (Mitsubishi SB No. 180) introduces operational dependence on that bulletin’s technical detail and parts availability (Document).","No alternative compliance routes, exemptions or procedural detail in the directive text increases clarity but shifts procedural detail to the Service Bulletin and regulator practice.","Historic compliance date (3/78 and 1 Aug 1978) means the directive is time-limited in effect and administrative complexity is low for contemporaneous operators."],"plain_english_summary":"This directive requires owners/operators of Mitsubishi MU-2 aeroplanes with serial numbers earlier than 697 to replace the engine nacelle upper door latch link per Mitsubishi Service Bulletin No. 180. \n\nThe work was mandated to be completed by 1 August 1978, at the owner/operator’s cost, to ensure continued airworthiness and compliance with the Civil Aviation Safety Authority’s schedule of airworthiness directives."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-20-engine-nacelle-upper-door-latch-link-replacement","history":"/api/acts/ad-mu-2-20-engine-nacelle-upper-door-latch-link-replacement/history","analysis":"/api/acts/ad-mu-2-20-engine-nacelle-upper-door-latch-link-replacement/analysis","conflicts":"/api/acts/ad-mu-2-20-engine-nacelle-upper-door-latch-link-replacement/conflicts","importantCases":"/api/acts/ad-mu-2-20-engine-nacelle-upper-door-latch-link-replacement/important-cases","documents":"/api/acts/ad-mu-2-20-engine-nacelle-upper-door-latch-link-replacement/documents"}}