{"id":"F2006B05118","name":"AD/CESSNA 185/27 - Self Locking Nuts","slug":"ad-cessna-185-27-self-locking-nuts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45129,"registerId":"commonwealth-F2006B05118-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 185/27 - Self Locking Nuts","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 185 Series Aeroplanes\n\n \n\nAD/CESSNA 185/27 Self Locking Nuts 4/78\n\nApplicability: Model 185 with S/Nos. 18502998 to 18503018. Requirement:  Action in accordance with Cessna SL No. SE77-44, Item 1. Compliance:               Within 100 hours time in service after 30 April 1978.\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":1713},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains tightly confined to its original narrow purpose: rectifying a specific hardware defect on a limited production run of 21 aircraft (serial numbers 18502998 through 18503018). It has not expanded in scope or application since issuance."},"complexity_factors":["Extremely brief document with only three operative provisions (applicability, requirement, compliance)","Single, unambiguous applicability criterion (specific serial number range)","No defined terms, cross-references to legislation, or interpretive sections","Simple compliance deadline with no exceptions or conditional extensions","Directive incorporates external technical standard by reference (Cessna Service Letter) rather than reproducing complex technical specifications in the legislative text"],"plain_english_summary":"This is a mandatory safety instruction (called an **Airworthiness Directive**) for owners of specific Cessna 185 aircraft.\n\n**Who it affects:**\n- Owners and operators of Cessna Model 185 aeroplanes with serial numbers between 18502998 and 18503018 (a specific production batch)\n\n**What it requires:**\n- These aircraft must undergo maintenance work regarding **self-locking nuts** (special nuts designed to stay tight under vibration without additional locking devices) following the exact instructions in Cessna Service Letter SE77-44, Item 1.\n\n**When it must be done:**\n- Within 100 hours of flight time after 30 April 1978.\n\n**Why it matters:**\n- Self-locking nuts prevent bolts from loosening due to engine vibration and movement. If they fail, critical components could detach during flight. This directive mandates a fix for a specific batch of aircraft that may have defective or improperly installed nuts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-27-self-locking-nuts","history":"/api/acts/ad-cessna-185-27-self-locking-nuts/history","analysis":"/api/acts/ad-cessna-185-27-self-locking-nuts/analysis","conflicts":"/api/acts/ad-cessna-185-27-self-locking-nuts/conflicts","importantCases":"/api/acts/ad-cessna-185-27-self-locking-nuts/important-cases","documents":"/api/acts/ad-cessna-185-27-self-locking-nuts/documents"}}