{"id":"F2006B03971","name":"AD/BEECH 55/21 - Fuel Line Chafing","slug":"ad-beech-55-21-fuel-line-chafing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43580,"registerId":"commonwealth-F2006B03971-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/21 - Fuel Line Chafing","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)  Beechcraft 55, 58 and 95-55 (Baron) Series Aeroplanes\n\n \n\nAD/BEECH 55/21 Fuel Line Chafing 3/71\n\nApplicability: Model 58 with S/Nos. TH-1 to TH-92, TH-110 and TH-114. Requirement:  Action in accordance with Beechcraft SI No. 0419-281.\n\nCompliance: Not later than the next 100 hourly inspection after 15 April 1971.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":1421},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted, original safety directive addressing a specific mechanical defect (fuel line chafing) in narrowly defined aircraft models. The scope remains strictly limited to the original airworthiness issue without expansion into unrelated operational or maintenance areas."},"complexity_factors":["Requires cross-referencing to external technical document (Beechcraft Service Instruction No. 0419-281) for actual procedural steps","Specific serial number applicability (TH-1 to TH-92, TH-110, TH-114)","Compliance deadline tied to aircraft maintenance schedule ('100 hourly inspection') rather than calendar date"],"plain_english_summary":"This is a mandatory safety notice (called an **Airworthiness Directive**) for owners of specific Beechcraft Baron aeroplanes.\n\n**Who it affects:**\nOwners of Beechcraft Model 58 Baron aircraft with serial numbers TH-1 through TH-92, plus TH-110 and TH-114.\n\n**What you must do:**\nInspect and repair the fuel lines to prevent them from rubbing against other parts (this is called \"chafing\"). You must follow the technical instructions in **Beechcraft Service Instruction No. 0419-281**.\n\n**When you must do it:**\nBefore or during your next \"100-hourly inspection\" (a regular maintenance check) after 15 April 1971.\n\n**Why it matters:**\nFuel lines that rub against nearby parts can wear through and leak fuel, creating a serious fire or explosion risk. This directive forces operators to fix the problem before it causes an accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-21-fuel-line-chafing","history":"/api/acts/ad-beech-55-21-fuel-line-chafing/history","analysis":"/api/acts/ad-beech-55-21-fuel-line-chafing/analysis","conflicts":"/api/acts/ad-beech-55-21-fuel-line-chafing/conflicts","importantCases":"/api/acts/ad-beech-55-21-fuel-line-chafing/important-cases","documents":"/api/acts/ad-beech-55-21-fuel-line-chafing/documents"}}