{"id":"F2006B05014","name":"AD/CESSNA 177/20 - Landing Gear Hydraulic Line","slug":"ad-cessna-177-20-landing-gear-hydraulic-line","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44924,"registerId":"commonwealth-F2006B05014-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 177/20 - Landing Gear Hydraulic Line","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 177 Series Aeroplanes\n\n \n\nAD/CESSNA 177/20 Landing Gear Hydraulic Line 11/75\n\nApplicability: All model 177RG with S/Nos. 177RG0283 to 177RG0732. Requirement:  Action in accordance with Cessna SL No. SE75-14.\n\nCompliance: Within 100 hours time in service after 28 November 1975.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2330},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow technical scope, addressing only the specific landing gear hydraulic line defect in the defined Cessna 177RG aircraft series as originally intended."},"complexity_factors":["Extremely brief instrument containing a single operative requirement","No definitions section or interpretive provisions","Simple applicability criteria limited to specific model and serial number range","Straightforward compliance trigger (100 hours time in service)","No exceptions, exemptions, or nested conditional logic"],"plain_english_summary":"**Who is affected:** Owners, operators, and maintenance engineers responsible for Cessna 177RG model aeroplanes with serial numbers ranging from 177RG0283 to 177RG0732.\n\n**What is required:** You must carry out specific maintenance actions on the landing gear hydraulic line exactly as described in **Cessna Service Letter No. SE75-14** (the manufacturer's official technical bulletin detailing the necessary inspections or replacements).\n\n**Compliance deadline:** The work must be completed within 100 hours of flight time (measured from when the aircraft is airborne) after 28 November 1975.\n\n**Why this matters:** This directive addresses a specific safety defect in the landing gear hydraulic system. Without correction, the defect could lead to landing gear failure, posing serious risks during takeoff and landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-177-20-landing-gear-hydraulic-line","history":"/api/acts/ad-cessna-177-20-landing-gear-hydraulic-line/history","analysis":"/api/acts/ad-cessna-177-20-landing-gear-hydraulic-line/analysis","conflicts":"/api/acts/ad-cessna-177-20-landing-gear-hydraulic-line/conflicts","importantCases":"/api/acts/ad-cessna-177-20-landing-gear-hydraulic-line/important-cases","documents":"/api/acts/ad-cessna-177-20-landing-gear-hydraulic-line/documents"}}