{"id":"F2006B11235","name":"AD/M20/30 Amdt 2 - Control Wheel Shaft - Inspection","slug":"ad-m20-30-amdt-2-control-wheel-shaft-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56955,"registerId":"commonwealth-F2006B11235-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/M20/30 Amdt 2 - Control Wheel Shaft - 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/M20/30\n\nAmdt 2\n\n\nControl Wheel Shaft - Inspection 9/78\n\n \n\nApplicability: All models M20, M20A, M20B, M20C with S/Nos. prior to 20-1238, M20D, M20E, M20F with S/Nos. prior to 22-1440, and M20G.\n\n \n\nDocument: Mooney SB M20-205B.\n\n \n\nCompliance: Unless already accomplished, within 25 hours time in service after achieving 1000 hours time in service and thereafter at intervals not exceeding 500 hours time in service until modified in accordance with SB M20-205B.\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":3,"scope_assessment":{"changed":true,"description":"The instrument is labelled \"Amdt 2\" (AD/M20/30 Amdt 2), indicating it is an amendment to a prior directive. The text provided is only the amended AD; the prior version and details of what was changed are not included here, so specific changes in scope or content from the original cannot be determined from this source alone."},"complexity_factors":["Narrow applicability by model and serial-number cutoffs creates a need for precise fleet record checks (Applicability).","Time-in-service milestone tracking: obligation triggers at 1,000 hours TIS, with a 25-hour window and recurring 500-hour intervals (Compliance).","Requirement refers to an external document (Mooney SB M20-205B) for modification details rather than providing procedural detail in the AD itself (Document).","Recurring inspection obligation continues until modified per the SB, creating an ongoing compliance and cost stream unless the one-off modification is completed (Compliance; Document).","The AD does not include the inspection procedure or parts lists, so operators must obtain and follow the service bulletin for technical steps, which adds coordination burden (Document)."],"plain_english_summary":"This airworthiness directive (AD) requires owners/operators of certain Mooney M20 series aeroplanes to inspect the control wheel shaft on a recurring basis and to follow a specific Mooney service bulletin if they choose to modify the aircraft so inspections are no longer required.\n\nWhat the instrument does, mechanically\n\n- It applies to specified Mooney M20 models and serial-number ranges (see \"Applicability\"). The listed models are M20, M20A, M20B, M20C with serial numbers prior to 20-1238; M20D, M20E, M20F with serial numbers prior to 22-1440; and M20G (Applicability).\n- The directive refers to Mooney Service Bulletin M20-205B as the document that describes the required modification or the method to comply (Document: Mooney SB M20-205B).\n- It requires an inspection to be done within 25 hours time in service after the aeroplane reaches 1,000 hours time in service, and then to be repeated at intervals not exceeding 500 hours time in service, until the aircraft is modified in accordance with SB M20-205B (Compliance).\n\nWho it affects and who decides\n\n- Aircraft owners and operators of the specified Mooney models (Applicability) are the parties that must pay for and arrange the inspections and any subsequent modification. They are responsible for tracking the aircraft's hours to meet the timing requirements (Compliance).\n- The Civil Aviation Safety Authority (as issuer of this AD) sets the compulsory requirement and enforces compliance (header identifying the AD and issuing authority).\n\nCosts, incentives and compliance burden\n\n- Direct costs fall on owners/operators: labour and parts for inspections, possible repair or replacement if defects are found, and costs to perform the SB M20-205B modification if chosen. The AD does not list labour rates or parts costs; it only prescribes timing and the reference document (Compliance; Document).\n- Maintenance organisations will typically carry out the inspections and any modification, so they are likely to gain business from compliance work. Owners/operators bear aircraft downtime while inspections/modifications are performed.\n- Compliance requires accurate tracking of time-in-service (TIS) milestones — reaching 1,000 hours, then the 25-hour follow-up window, and recurring 500-hour intervals — and recordkeeping of inspections and any modification performed (Compliance).\n\nDiscretion, implementation risk and operational effect\n\n- The AD prescribes inspection intervals and a specific service bulletin for modification; there is little regulatory discretion for owners/operators other than timing and choice to perform the modification described in the SB to end recurring inspections (Compliance; Document).\n- Implementation risks include availability of parts or approved modification resources described in SB M20-205B, scheduling of maintenance slots, and the operational impact of aircraft downtime while complying. The AD text does not describe the inspection procedure or expected findings; those are in the referenced service bulletin (Document).\n\nPurpose claims and trade-offs\n\n- The AD title and content direct attention to the control wheel shaft and require inspection; the document therefore operates to detect and address whatever unsafe condition the AD and the referenced service bulletin are intended to remedy. That stated purpose is reflected in the mandated inspections and the option to modify per SB M20-205B (Document; Compliance).\n- The trade-offs are concrete: recurring inspection costs and aircraft downtime for owners/operators versus the alternative of performing the SB M20-205B modification (which itself incurs a one-off cost) to remove the recurring inspection requirement (Compliance; Document).\n\nPractical effect in a single sentence\n\n- Owners/operators of the specified Mooney M20 aeroplanes must inspect the control wheel shaft soon after the aeroplane reaches 1,000 hours TIS and then every 500 hours until they perform the modification described in Mooney SB M20-205B; they bear the inspection and modification costs and must keep records to demonstrate compliance (Applicability; Document; Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing Airworthiness Directive. The scope remains tightly focused on the original safety issue (control wheel shaft inspection in specific Mooney aircraft). Amendment 2 likely updated reference documents or compliance times without expanding the substantive scope beyond the original safety intent."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly used ('time in service' — standard aviation term meaning flight hours)","Single compliance pathway with clear time triggers (25 hours after 1000 hours, then 500-hour intervals)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple conditional structure: 'Unless already accomplished' is the only qualifier","Narrow applicability — specific aircraft models and serial number ranges listed explicitly"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific models of **Mooney M20 series aeroplanes** (light aircraft).\n\n**What it requires:**\n- Owners and operators must **inspect the control wheel shaft** (the steering column that connects the pilot's yoke to the aircraft's control systems) for cracks or damage.\n- **When:** First inspection must happen within 25 flight hours after the aircraft reaches 1,000 total flight hours, then **every 500 flight hours** after that.\n- **Until when:** These repeat inspections continue until the aircraft is permanently modified according to Mooney Service Bulletin M20-205B.\n\n**Who it affects:**\n- Owners and operators of older Mooney M20 aircraft (specific serial numbers before certain cut-offs, plus the M20D and M20G models regardless of serial number).\n\n**Why it matters:**\nControl wheel shaft failure could cause **loss of control of the aircraft**. This AD prevents accidents by catching fatigue cracks before they become catastrophic. It's a classic aviation safety regulation — prescriptive, time-based, and tied to manufacturer service bulletins."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-30-amdt-2-control-wheel-shaft-inspection","history":"/api/acts/ad-m20-30-amdt-2-control-wheel-shaft-inspection/history","analysis":"/api/acts/ad-m20-30-amdt-2-control-wheel-shaft-inspection/analysis","conflicts":"/api/acts/ad-m20-30-amdt-2-control-wheel-shaft-inspection/conflicts","importantCases":"/api/acts/ad-m20-30-amdt-2-control-wheel-shaft-inspection/important-cases","documents":"/api/acts/ad-m20-30-amdt-2-control-wheel-shaft-inspection/documents"}}