{"id":"F2006B05015","name":"AD/CESSNA 177/21 - Nose Landing Gear Upper Support Locknut","slug":"ad-cessna-177-21-nose-landing-gear-upper-support-locknut","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44925,"registerId":"commonwealth-F2006B05015-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 177/21 - Nose Landing Gear Upper Support Locknut","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 177/21 Nose Landing Gear Upper Support Locknut 5/76\n\nApplicability: All model 177 with S/Nos. 17701974 to 17702200. Requirement:  Action in accordance with Cessna SL SE76-1.\n\nCompliance: Within 100 hours time in service after 31 May 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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":979},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope as a specific safety intervention for a identified mechanical defect in a defined production batch of aircraft. No evidence of scope creep or expansion beyond the original nose landing gear locknut issue."},"complexity_factors":["Single discrete maintenance action required","Narrow applicability limited to specific serial number range","External reference to manufacturer service letter (SL SE76-1) without reproducing technical details","Simple compliance trigger (flight hours after fixed date)","No nested exceptions or conditional logic"],"plain_english_summary":"**What this does:** This is a safety order (called an Airworthiness Directive) that requires owners or operators of specific Cessna 177 aeroplanes to inspect or replace a potentially faulty **nose landing gear upper support locknut** (a critical fastening component).\n\n**Who it affects:** Only Cessna 177 model aircraft with serial numbers between 17701974 and 17702200.\n\n**What must be done:** Follow the instructions in Cessna Service Letter SE76-1 (a technical bulletin from the manufacturer) to address the locknut issue.\n\n**When:** The work must be completed within 100 hours of flight time after 31 May 1976.\n\n**Why it matters:** Faulty nose landing gear components can cause landing gear collapse during takeoff or landing, posing serious safety risks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-177-21-nose-landing-gear-upper-support-locknut","history":"/api/acts/ad-cessna-177-21-nose-landing-gear-upper-support-locknut/history","analysis":"/api/acts/ad-cessna-177-21-nose-landing-gear-upper-support-locknut/analysis","conflicts":"/api/acts/ad-cessna-177-21-nose-landing-gear-upper-support-locknut/conflicts","importantCases":"/api/acts/ad-cessna-177-21-nose-landing-gear-upper-support-locknut/important-cases","documents":"/api/acts/ad-cessna-177-21-nose-landing-gear-upper-support-locknut/documents"}}