{"id":"F2006B11232","name":"AD/M20/25 - Dukes Electric Landing Gear Actuator - Inspection","slug":"ad-m20-25-dukes-electric-landing-gear-actuator-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56951,"registerId":"commonwealth-F2006B11232-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/M20/25 - Dukes Electric Landing Gear Actuator - 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)  Mooney M20 Series Aeroplanes\n\n \n\nAD/M20/25 Dukes Electric Landing Gear Actuator - Inspection 11/76\n\nApplicability: All model M20 series fitted with Dukes P/N 4196-00-1C electric landing gear actuator.\n\n \n\nDocument: Mooney SB No. 190, Part 1.\n\n \n\nCompliance: Within 100 hours time in service after 31 December 1976 and there- after at intervals not exceeding 200 hours time in service.\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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope is narrowly defined in the text: it applies only to Mooney M20 aeroplanes fitted with Dukes P/N 4196-00-1C and requires inspections as specified. The instrument does not expand or narrow that applicability beyond the stated wording (Applicability)."},"complexity_factors":["Narrow technical applicability — limited to Mooney M20 series fitted with Dukes P/N 4196-00-1C (Applicability).","Fixed, simple inspection schedule (initial within 100 hours after 31‑Dec‑1976; then every 200 hours) creates straightforward tracking requirement (Compliance).","Mandatory reliance on an external document (Mooney SB No. 190, Part 1) for procedural detail — requires operators to obtain and follow that bulletin (Document).","Operational scheduling and potential repair cost uncertainty — inspections may reveal work that varies in scope and cost (Compliance).","Reference to regulatory framework (Civil Aviation Regulations 1998, Part 39) but limited discretionary rules in the directive itself."],"plain_english_summary":"# What this instrument does (mechanical change)\n\nThis airworthiness directive requires owners/operators of Mooney M20 aeroplanes that are fitted with the Dukes electric landing gear actuator, part number 4196-00-1C, to carry out inspections according to the procedures in Mooney Service Bulletin No. 190, Part 1. The inspections must be done within 100 hours time in service after 31 December 1976 and then repeatedly at intervals not exceeding 200 hours time in service. (See: Applicability; Document; Compliance.)\n\n# Who this affects\n\n- Aircraft owners and operators of Mooney M20 series aeroplanes that have the Dukes P/N 4196-00-1C electric landing gear actuator. (Applicability)\n- Maintenance personnel who must follow Mooney SB No. 190, Part 1 when performing the inspections. (Document)\n\n# How it works, step by step\n\n1. Identify whether the aeroplane is an M20 fitted with Dukes P/N 4196-00-1C. If not, the directive does not apply. (Applicability)\n2. If the actuator is fitted, consult and follow Mooney Service Bulletin No. 190, Part 1 for the inspection procedures. (Document)\n3. Do the first inspection within 100 hours time in service after 31 December 1976. (Compliance)\n4. Repeat the inspection at intervals not exceeding 200 hours time in service thereafter. (Compliance)\n\n# Purpose statements and implications\n\n- The directive itself does not include an explicit statement of why the inspections are required beyond referencing the service bulletin. The text mandates inspections but does not set out the underlying failure modes or safety rationale in this instrument. (Document)\n\n- If the intended purpose is to identify and address actuator defects before they cause problems, then the concrete implications are: operators must schedule recurring inspections and bear the direct cost and time for inspections and any necessary repairs; maintenance providers must apply the service-bulletin procedures; and aircraft availability will be affected to the extent inspections or repairs are needed. (Applicability; Document; Compliance)\n\n# Who pays, who decides, and what changes in behaviour\n\n- Who pays: the aircraft owner/operator fitted with the specified actuator bears the inspection costs, and any repair or replacement costs discovered by those inspections. (Applicability; Compliance)\n- Who decides: the directive is issued under the Civil Aviation regulatory framework and refers operators to Mooney SB No. 190, Part 1 as the required procedure. Individual maintenance providers decide the specific labour scheduling and whether further maintenance is necessary based on the inspection findings and the SB instructions. (Part 39 heading; Document)\n- Behaviour change: affected operators must add this inspection schedule to their maintenance planning, track hours-in-service to meet the 100-hour initial and 200-hour recurring intervals, and follow the referenced SB when performing inspections. (Compliance; Document)\n\n# Costs, incentives, and trade-offs (mechanical mechanisms)\n\n- Direct costs: inspection labour and any parts/repairs found necessary during inspection are paid by the aircraft owner/operator. (Compliance)\n- Time cost and opportunity cost: aircraft may be unavailable while inspected or repaired; operators need to plan flights around inspection intervals. (Compliance)\n- Incentives: owners/operators have an incentive to comply to remain airworthy and to avoid regulatory noncompliance; maintenance providers have an incentive to follow the referenced SB to meet the directive. (Document)\n- Bureaucratic discretion: the directive sets fixed intervals and a specific SB reference, leaving limited room for discretionary deviation in scheduling or procedure within this instrument itself. (Document; Compliance)\n\n# Implementation and compliance burden\n\n- Compliance requires tracking hours-in-service for each affected aeroplane and integrating recurring inspections into maintenance schedules. (Compliance)\n- The directive refers to an external document (Mooney SB No. 190, Part 1) for the inspection procedures, so operators must obtain and follow that service bulletin. (Document)\n\n# Concentrated benefits and diffuse costs\n\n- The directive's obligations and any direct benefits from inspections are concentrated on owners/operators of M20 aircraft fitted with the specified Dukes actuator; other owners/operators are unaffected. (Applicability)\n\n# What the instrument does not do (based on its text)\n\n- The directive does not specify corrective actions, allowable tolerances, or criteria for grounding or replacement in its own text; it relies on the referenced service bulletin for procedural detail. (Document)\n- The directive does not state penalties, funding, or other enforcement mechanics in the text provided here. (Document; Compliance)\n\n(References: Applicability; Document; Compliance; header reference to Civil Aviation Regulations Part 39.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific aircraft component. It has not expanded beyond its original purpose of mandating inspections for the Dukes landing gear actuator in Mooney M20 aircraft."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 operative provisions: applicability, reference document, compliance deadline, and recurring interval","No defined terms section","No cross-references to other legislation beyond a single service bulletin citation","Simple conditional logic (if aircraft has this part, then inspect)","Single exceptionless requirement with clear time-based triggers"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Mooney M20 series aircraft to inspect a particular part: the **Dukes electric landing gear actuator** (part number 4196-00-1C).\n\n**What it requires:**\n- **Who must comply:** Anyone operating a Mooney M20 series aircraft fitted with this specific landing gear actuator.\n- **What to do:** Inspect the actuator following the procedures in Mooney Service Bulletin No. 190, Part 1.\n- **When:** First inspection must happen within 100 hours of flying time after 31 December 1976, then repeated every 200 hours of flying time thereafter.\n\n**Why it matters:** Landing gear failures can be catastrophic. This directive addresses a known safety issue with this specific component, ensuring potential defects are caught before they cause accidents. Non-compliance means the aircraft cannot legally fly in Australian airspace."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-25-dukes-electric-landing-gear-actuator-inspection","history":"/api/acts/ad-m20-25-dukes-electric-landing-gear-actuator-inspection/history","analysis":"/api/acts/ad-m20-25-dukes-electric-landing-gear-actuator-inspection/analysis","conflicts":"/api/acts/ad-m20-25-dukes-electric-landing-gear-actuator-inspection/conflicts","importantCases":"/api/acts/ad-m20-25-dukes-electric-landing-gear-actuator-inspection/important-cases","documents":"/api/acts/ad-m20-25-dukes-electric-landing-gear-actuator-inspection/documents"}}