{"id":"F2006B08334","name":"AD/CESSNA 400/48 - Main Landing Gear Down Lock Pin and Set Screw - Inspection","slug":"ad-cessna-400-48-main-landing-gear-down-lock-pin-and-set-screw-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115741,"registerId":"commonwealth-F2006B08334-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/48 - Main Landing Gear Down Lock Pin and Set Screw - Inspection","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 400 Series Aeroplanes\n\n \n\nAD/CESSNA 400/48 Main Landing Gear Down Lock Pin\n\nand Set Screw - Inspection\n\n\n8/76\n\n \n\nApplicability: Model 401 with S/N 401-0001 to 401B0221. Model 402 with S/N 402-0001 to 402B0630, 0632 to 0919, 0921, 0922, 0924 to 0929. Model 411 with S/N 411-0001 to\n\n411A0300. Model 414 with S/N 414-0001 to 414-0653. Model 421 with S/N 421-\n\n0001 to 421B0889, 0891 to 0939, 0942 to 0957, 0959, 0964.\n\n \n\nDocument: Cessna SL ME76-4.\n\n \n\nCompliance: Within 100 hours time in service after 31 August 1976.\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":3833},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope targeting specific landing gear components on defined Cessna aircraft models. It has not expanded beyond the original safety issue addressed in August 1976."},"complexity_factors":["Single discrete mandate with external technical reference (Cessna Service Letter SL ME76-4)","Highly technical subject matter (aircraft landing gear mechanics) requiring aviation engineering knowledge","Specific serial number applicability requiring precise cross-referencing against aircraft registration and manufacturing logs","Historical compliance date (1976) indicating this is legacy safety legislation still applicable to airworthy vintage aircraft"],"plain_english_summary":"This Airworthiness Directive requires owners of certain Cessna 400‑series aircraft (specific serial-numbered 401/402/411/414/421 models) to inspect the main landing‑gear down‑lock pin and set screw per Cessna Service Letter SL ME76‑4. The check must be done within 100 flight hours after 31 August 1976 to prevent possible gear collapse on landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-48-main-landing-gear-down-lock-pin-and-set-screw-inspection","history":"/api/acts/ad-cessna-400-48-main-landing-gear-down-lock-pin-and-set-screw-inspection/history","analysis":"/api/acts/ad-cessna-400-48-main-landing-gear-down-lock-pin-and-set-screw-inspection/analysis","conflicts":"/api/acts/ad-cessna-400-48-main-landing-gear-down-lock-pin-and-set-screw-inspection/conflicts","importantCases":"/api/acts/ad-cessna-400-48-main-landing-gear-down-lock-pin-and-set-screw-inspection/important-cases","documents":"/api/acts/ad-cessna-400-48-main-landing-gear-down-lock-pin-and-set-screw-inspection/documents"}}