{"id":"F2006B11381","name":"AD/MU-2/51 - Autopilot Engage Switch Guard","slug":"ad-mu-2-51-autopilot-engage-switch-guard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57282,"registerId":"commonwealth-F2006B11381-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/MU-2/51 - Autopilot Engage Switch Guard","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-2/51 Autopilot Engage Switch Guard 3/92\n\nApplicability: All Models MU-2 fitted with Bendix M4C or M4D autopilots. Requirement:  Action in accordance with MHI MU-2 Service Bulletin 076/22-008.\n\nNote: JCAB TCD-3464-91 also refers.\n\n \n\nCompliance: Within 100 hours time in service after 6 March 1992. Background: To preclude the unintentional engagement of the autopilot.\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 is a discrete, targeted safety directive addressing a specific technical defect in specific aircraft. It has not expanded beyond its original purpose of preventing inadvertent autopilot engagement."},"complexity_factors":["Single, specific applicability clause (one aircraft type, two autopilot models)","Single requirement referencing an external technical document (service bulletin)","Simple compliance deadline (100 hours time in service from fixed date)","No defined terms, no cross-references to other legislation, no conditional logic","Extremely short document (approximately 100 words of substantive content)","Straightforward safety purpose with no exceptions or exemptions stated"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) for a specific type of aircraft: the **Mitsubishi MU-2 series**.\n\n**What it does:**\n- Requires owners/operators to install a **guard** (a physical protective cover) around the autopilot engage switch\n- This prevents pilots from accidentally turning on the autopilot\n\n**Who it affects:**\n- Anyone operating MU-2 aircraft fitted with **Bendix M4C or M4D autopilots**\n\n**What must be done:**\n- Follow the instructions in **Mitsubishi Service Bulletin 076/22-008**\n- Complete the work **within 100 flight hours** after 6 March 1992\n\n**Why it matters:**\nUnintentional autopilot engagement can cause sudden, unexpected aircraft behaviour — potentially leading to loss of control. This simple hardware fix prevents that dangerous scenario."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope aligns with its stated purpose: it applies only to MU-2 aeroplanes fitted with Bendix M4C or M4D autopilots and mandates the specific corrective action identified in the manufacturer service bulletin, to be completed within a specified 100-hour window. The instrument does not expand obligations beyond that fleet subset or beyond compliance with the referenced service bulletin and related noted document (JCAB TCD-3464-91)."},"complexity_factors":["Narrow and specific applicability: only MU-2 models fitted with Bendix M4C or M4D autopilots (\"Applicability: All Models MU-2 fitted with Bendix M4C or M4D autopilots.\")","Delegation of technical detail to an external document (MHI MU-2 Service Bulletin 076/22-008) increases operational dependence on that bulletin for exact steps (\"Requirement: Action in accordance with MHI MU-2 Service Bulletin 076/22-008.\")","Short, fixed compliance window (100 hours time in service after 6 March 1992) creates scheduling constraint but is straightforward to calculate (\"Compliance: Within 100 hours time in service after 6 March 1992.\")","Reference to an additional technical document (JCAB TCD-3464-91) adds a secondary source to consult (\"Note: JCAB TCD-3464-91 also refers.\")","No detailed enforcement or acceptance criteria in the text; compliance assessment depends on airworthiness processes and the service bulletin content (implicit from the directive structure)."],"plain_english_summary":"Owners/operators of Mitsubishi MU-2 aircraft fitted with Bendix M4C or M4D autopilots must, within 100 hours’ time-in-service after 6 March 1992, have the aircraft modified or serviced in accordance with MHI MU-2 Service Bulletin 076/22-008 (JCAB TCD-3464-91 also referenced). The mandatory action—at the operator’s cost—is intended to prevent unintended autopilot engagement by making the manufacturer’s remedy an airworthiness requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-51-autopilot-engage-switch-guard","history":"/api/acts/ad-mu-2-51-autopilot-engage-switch-guard/history","analysis":"/api/acts/ad-mu-2-51-autopilot-engage-switch-guard/analysis","conflicts":"/api/acts/ad-mu-2-51-autopilot-engage-switch-guard/conflicts","importantCases":"/api/acts/ad-mu-2-51-autopilot-engage-switch-guard/important-cases","documents":"/api/acts/ad-mu-2-51-autopilot-engage-switch-guard/documents"}}