{"id":"F2006B08407","name":"AD/CESSNA 500/7 - Landing Gear Unlock Actuator and Control System","slug":"ad-cessna-500-7-landing-gear-unlock-actuator-and-control-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115863,"registerId":"commonwealth-F2006B08407-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 500/7 - Landing Gear Unlock Actuator and Control System","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)  Cessna 500 (Citation) Series Aeroplanes\n\n \n\nAD/CESSNA 500/7 Landing Gear Unlock Actuator\n\nand Control System\n\n\n7/74\n\n \n\nApplicability: All models with S/Nos. 500-0001 to 500-0142 and 500-0144 to 500-0156 and\n\n500-0158.\n\n \n\nDocument: Cessna citation SB 32-17.\n\n \n\nCompliance: Within 50 hours time in service after 14 June 1974 or before 31 July 1974 whichever occurs first.\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":1585},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope—mandating a specific landing gear safety modification for defined aircraft serial numbers. There is no evidence of scope expansion beyond the original safety intent."},"complexity_factors":["Requires cross-referencing aircraft serial numbers against three specific non-contiguous ranges","Compliance contingent on external technical document (Cessna Service Bulletin SB 32-17) not reproduced in the directive","Time-based compliance calculation using 'whichever occurs first' logic"],"plain_english_summary":"This Airworthiness Directive mandates a **mandatory safety fix** for specific **Cessna 500 (Citation) series jet aircraft**.\n\n**Who is affected:**\nOwners and operators of Cessna 500 models with these serial numbers:\n- 500-0001 through 500-0142\n- 500-0144 through 500-0156  \n- 500-0158\n\n**What must be done:**\nYou must follow the instructions in **Cessna Service Bulletin SB 32-17**, which deals with the **landing gear unlock actuator and control system**. This typically means inspecting, repairing, or replacing parts of the landing gear mechanism to prevent malfunction.\n\n**Deadline:**\nComplete the work within **50 hours of flight time** after 14 June 1974 **or** before 31 July 1974 — whichever comes first.\n\n**Why it matters:**\nLanding gear failures can be catastrophic. This directive ensures potentially defective actuators are fixed before they can cause the gear to collapse or fail to deploy during landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-500-7-landing-gear-unlock-actuator-and-control-system","history":"/api/acts/ad-cessna-500-7-landing-gear-unlock-actuator-and-control-system/history","analysis":"/api/acts/ad-cessna-500-7-landing-gear-unlock-actuator-and-control-system/analysis","conflicts":"/api/acts/ad-cessna-500-7-landing-gear-unlock-actuator-and-control-system/conflicts","importantCases":"/api/acts/ad-cessna-500-7-landing-gear-unlock-actuator-and-control-system/important-cases","documents":"/api/acts/ad-cessna-500-7-landing-gear-unlock-actuator-and-control-system/documents"}}