{"id":"F2006B02064","name":"AD/AA-5/6 - Fuel Tank Vent Lines - Modification","slug":"ad-aa-5-6-fuel-tank-vent-lines-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41293,"registerId":"commonwealth-F2006B02064-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AA-5/6 - Fuel Tank Vent Lines - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue NK,Aircraft below 5700 kg,Gulfstream (Grumman American/ American Aviation) AA-5 Series Aeroplanes,Fuel Tank Vent Lines - Modification,6\ntitle: Airworthiness Directive - AD/AA-5/6 - Fuel Tank Vent Lines - Modification\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)  Gulfstream (Grumman American/ American Aviation) AA-5 Series Aeroplanes\n\n \n\nAD/AA-5/6 Fuel Tank Vent Lines - Modification NK\n\nApplicability: All models.\n\n \n\nRequirement: 1. Replace all PVC plastic hose connectors on the fuel tank venting system with fuel resistant rubber hose connectors.\n\n \n\n2.    Where practicable, bead the ends of the aluminium alloy vent lines where joined by hose connectors.\n\n \n\n3.    Ensure that the end distance between adjoining aluminium alloy vent lines in hose connectors is no greater than 1/2\".\n\n \n\n4.    Replace all spring wire type hose clips on the fuel tank venting system with screw type hose clips.\n\n \n\nCompliance: Within 100 hours’ time in service after 31 August 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1401},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains tightly focused on its original purpose: rectifying specific safety defects in the fuel venting system of a particular light aircraft series. No expansion beyond the original mechanical safety intent is evident."},"complexity_factors":["Only 4 specific mechanical requirements with no sub-paragraphs","Single applicability criterion (aircraft model series)","No cross-references to other legislation or regulations","Simple compliance trigger (hours of flight time after fixed date)","Minimal conditional language (only 'where practicable')"],"plain_english_summary":"This AD requires all owners/operators of Gulfstream AA-5 series aircraft to modify the fuel tank venting system to prevent fuel leaks and fire hazards. Actions include replacing PVC connectors with fuel‑resistant rubber, securing tube ends (beading where possible), limiting gaps between tube ends to 1/2\", and swapping spring clips for screw‑type hose clamps.\n\nCompliance is mandatory within 100 flight hours after August 31, 1973."}},"importantCases":[],"_links":{"self":"/api/acts/ad-aa-5-6-fuel-tank-vent-lines-modification","history":"/api/acts/ad-aa-5-6-fuel-tank-vent-lines-modification/history","analysis":"/api/acts/ad-aa-5-6-fuel-tank-vent-lines-modification/analysis","conflicts":"/api/acts/ad-aa-5-6-fuel-tank-vent-lines-modification/conflicts","importantCases":"/api/acts/ad-aa-5-6-fuel-tank-vent-lines-modification/important-cases","documents":"/api/acts/ad-aa-5-6-fuel-tank-vent-lines-modification/documents"}}