{"id":"F2006B11254","name":"AD/M20/49 - Fuel Selector Valve","slug":"ad-m20-49-fuel-selector-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57024,"registerId":"commonwealth-F2006B11254-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/M20/49 - Fuel Selector Valve","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/M20/49 Fuel Selector Valve 13/95 DM\n\nApplicability: All M20K series aircraft fitted with Gerdes P/N A-2580 fuel selector valve. Requirement:               Unless previously carried out action in accordance with Mooney Aircraft Corporation\n\nService Bulletin M20-256.\n\n \n\nNote: FAA AD 95-18-12 Amdt 39-9359 refers.\n\n \n\nCompliance: Within 50 hours times in service from 1 November 1995.\n\n \n\nBackground: The manufacturer has advised of a Gerdes selector valve malfunction which could result in an unscheduled landing of the aircraft.\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 mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating the fuel selector valve fix."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined applicability criterion (M20K series + specific part number)","Single compliance action (follow Service Bulletin M20-256)","Simple time-based compliance trigger (50 hours time-in-service from fixed date)","No nested exceptions, conditional logic, or cross-references to other legislation beyond a reference to related FAA directive","No interpretation section or defined terms"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific Mooney M20K aeroplanes to inspect or replace a faulty fuel selector valve made by Gerdes (part number A-2580). The valve can malfunction, potentially causing engine fuel starvation and forcing an emergency landing.\n\n**Who it affects:** Anyone who owns or operates a Mooney M20K series aircraft fitted with the specific Gerdes fuel selector valve mentioned.\n\n**What must be done:** Follow the instructions in Mooney Aircraft Corporation Service Bulletin M20-256 (a technical repair notice from the manufacturer). This typically involves inspecting, repairing, or replacing the valve.\n\n**When it must be done:** Within 50 hours of flight time after 1 November 1995.\n\n**Why it matters:** A faulty fuel selector valve could cut off fuel to the engine unexpectedly. This creates a serious safety risk — the engine could stop working mid-flight, forcing the pilot to land somewhere unplanned (an \"unscheduled landing\"). The directive prevents accidents by ensuring the defective part is fixed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD's scope is as stated in the instrument: it applies to all Mooney M20K series aircraft fitted with Gerdes P/N A-2580 fuel selector valves and requires action in accordance with Mooney Service Bulletin M20-256 within the specified 50-hour window (Applicability; Requirement; Compliance). The text does not expand or narrow that applicability or alter the original corrective action mandated by the manufacturer (Requirement; Background)."},"complexity_factors":["Narrow applicability: applies only to Mooney M20K series aircraft fitted with Gerdes P/N A-2580 fuel selector valve (Applicability).","Single, clear compliance action: mandates compliance with a single manufacturer service bulletin rather than multiple procedures (Requirement).","Short, specified compliance window: 50 hours time-in-service from a fixed date (Compliance).","Dependence on external document: technical details are in Service Bulletin M20-256, which must be obtained to implement the directive (Requirement).","Cross-reference to FAA AD: presence of related foreign AD noted but does not add procedural complexity within this AD (Note)."],"plain_english_summary":"This AD requires owners/operators of Mooney M20K aeroplanes fitted with Gerdes fuel selector valve P/N A‑2580 to comply with Mooney Service Bulletin M20‑256 (the manufacturer’s corrective action) within 50 hours TIS from 1 November 1995, to address a valve malfunction that could cause unscheduled landings. Compliance is mandatory under CASA, costs and downtime fall on affected owners/operators, and the AD aligns with the related FAA directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-49-fuel-selector-valve","history":"/api/acts/ad-m20-49-fuel-selector-valve/history","analysis":"/api/acts/ad-m20-49-fuel-selector-valve/analysis","conflicts":"/api/acts/ad-m20-49-fuel-selector-valve/conflicts","importantCases":"/api/acts/ad-m20-49-fuel-selector-valve/important-cases","documents":"/api/acts/ad-m20-49-fuel-selector-valve/documents"}}