{"id":"F2006B11219","name":"AD/M20/11 - Main Landing Gear Retraction Truss - Modification","slug":"ad-m20-11-main-landing-gear-retraction-truss-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56937,"registerId":"commonwealth-F2006B11219-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/M20/11 - Main Landing Gear Retraction Truss - Modification","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/M20/11 Main Landing Gear Retraction Truss - Modification 9/67\n\nApplicability: All model M20C with S/Nos. 2807 to 3466 and Model M20E with S/Nos. 470 to 1270.\n\n \n\nDocument: Mooney SB M20-143.\n\n \n\nCompliance: Within 100 hours time in service after 7 September 1967.\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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1406},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope: a specific structural modification for identified Mooney aircraft models. There is no expansion beyond the landing gear retraction truss modification."},"complexity_factors":["Single-sentence applicability clause with specific aircraft models and serial number ranges","No defined terms or interpretation section","One compliance action referenced to external manufacturer document (SB M20-143)","Simple time-based deadline with no conditional provisions or exceptions","No cross-references to other legislation or regulatory parts within the directive text"],"plain_english_summary":"This **Airworthiness Directive** (a mandatory safety order from the aviation regulator) requires specific Mooney aircraft owners to fix a structural problem with the main landing gear.\n\n**What it does:**\nForces owners to modify the *main landing gear retraction truss* (the metal framework that holds the wheels and folds them into the fuselage) according to the manufacturer's Service Bulletin M20-143.\n\n**Who must comply:**\n- Mooney M20C aircraft with serial numbers 2807 to 3466\n- Mooney M20E aircraft with serial numbers 470 to 1270\n\n**Deadline:**\nWithin 100 hours of flight time after 7 September 1967 *(note: this is a historical directive from 1967)*.\n\n**Why it exists:**\nTo prevent structural failure of the landing gear system during operation, which could cause a crash during landing or gear retraction."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-11-main-landing-gear-retraction-truss-modification","history":"/api/acts/ad-m20-11-main-landing-gear-retraction-truss-modification/history","analysis":"/api/acts/ad-m20-11-main-landing-gear-retraction-truss-modification/analysis","conflicts":"/api/acts/ad-m20-11-main-landing-gear-retraction-truss-modification/conflicts","importantCases":"/api/acts/ad-m20-11-main-landing-gear-retraction-truss-modification/important-cases","documents":"/api/acts/ad-m20-11-main-landing-gear-retraction-truss-modification/documents"}}