{"id":"F2006B03980","name":"AD/BEECH 55/31 - Fuel Vent System","slug":"ad-beech-55-31-fuel-vent-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43589,"registerId":"commonwealth-F2006B03980-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/31 - Fuel Vent System","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 55/31 Fuel Vent System 6/73\n\nApplicability: Model 58 with S/Nos. TH-1 to TH-340.\n\n \n\nRequirement: Action in accordance with Beechcraft SI No. 0568-281, Part II. Compliance:  Within 100 hours’ time in service after 31 July 1973.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":1763},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope as a specific airworthiness requirement addressing only the fuel vent system on defined Beechcraft Model 58 aircraft. It has not expanded to cover additional aircraft systems, models, or operational requirements."},"complexity_factors":["Single external reference to a technical service manual (Beechcraft SI No. 0568-281)","Narrow applicability limited to specific aircraft serial number range (TH-1 to TH-340)","Clear, unconditional compliance requirement with single metric (100 hours time in service)","Minimal defined terms and no nested exceptions"],"plain_english_summary":"This Airworthiness Directive (AD) is a mandatory safety order requiring specific maintenance on certain Beechcraft Baron aircraft to fix potential problems with the fuel vent system.\n\n**Who is affected**\nOwners and operators of Beechcraft Model 58 aircraft with serial numbers TH-1 through TH-340.\n\n**What you must do**\nCarry out the maintenance actions specified in Beechcraft Service Instruction No. 0568-281, Part II. These steps address the fuel vent system — the parts that let air into fuel tanks to prevent dangerous vacuum formation during flight.\n\n**Deadline**\nComplete the work within 100 hours of flight time (measured as \"time in service\") after 31 July 1973.\n\n**Why this matters**\nThe directive addresses defects that could cause fuel leaks, system blockages, or fire hazards. Compliance is legally required to keep these aircraft airworthy and safe to fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-31-fuel-vent-system","history":"/api/acts/ad-beech-55-31-fuel-vent-system/history","analysis":"/api/acts/ad-beech-55-31-fuel-vent-system/analysis","conflicts":"/api/acts/ad-beech-55-31-fuel-vent-system/conflicts","importantCases":"/api/acts/ad-beech-55-31-fuel-vent-system/important-cases","documents":"/api/acts/ad-beech-55-31-fuel-vent-system/documents"}}