{"id":"F2006B11225","name":"AD/M20/18 - Nose Gear Steering Horn Assembly Steering Shaft - Replacement","slug":"ad-m20-18-nose-gear-steering-horn-assembly-steering-shaft-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56943,"registerId":"commonwealth-F2006B11225-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/M20/18 - Nose Gear Steering Horn Assembly Steering Shaft - Replacement","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/M20/18 Nose Gear Steering Horn Assembly Steering Shaft - Replacement\n\n\n10/72\n\n \n\nApplicability: Model M20C with S/Nos. 690002 to 690021. Model M20E with S/Nos. 690002 to 690027. Model M20F with S/Nos. 690002 to 690032. Model M20G with S/Nos. 690004 to 690008.\n\n \n\nDocument: Mooney SB M20-172.\n\n \n\nCompliance: Within 100 hours time in service after 31 October 1972.\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":1620},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original, narrow technical scope focused solely on the replacement of the nose gear steering shaft for safety purposes on the specified aircraft models. There is no evidence of scope expansion into unrelated systems or aircraft types."},"complexity_factors":["Single, specific mechanical action required (replacement of one named component)","Limited applicability covering only 4 aircraft models with explicitly defined serial number ranges","Simple compliance metric (100 hours time in service after a fixed date)","No exceptions, exemptions, or conditional clauses within the instrument","Only one external reference (manufacturer's Service Bulletin M20-172)"],"plain_english_summary":"Owners and operators of certain Mooney M20C/E/F/G aircraft must replace the steering-horn assembly’s steering shaft per Mooney Service Bulletin M20-172.  \n\nThis time-in-service action (to be done within 100 flight hours after 31 October 1972) prevents shaft failure that could cause loss of nose-wheel steering during taxi, takeoff, or landing, reducing risk of runway excursions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-18-nose-gear-steering-horn-assembly-steering-shaft-replacement","history":"/api/acts/ad-m20-18-nose-gear-steering-horn-assembly-steering-shaft-replacement/history","analysis":"/api/acts/ad-m20-18-nose-gear-steering-horn-assembly-steering-shaft-replacement/analysis","conflicts":"/api/acts/ad-m20-18-nose-gear-steering-horn-assembly-steering-shaft-replacement/conflicts","importantCases":"/api/acts/ad-m20-18-nose-gear-steering-horn-assembly-steering-shaft-replacement/important-cases","documents":"/api/acts/ad-m20-18-nose-gear-steering-horn-assembly-steering-shaft-replacement/documents"}}