{"id":"F2006B02061","name":"AD/AA-5/3 - Fuel Tank Vent Lines - Modification","slug":"ad-aa-5-3-fuel-tank-vent-lines-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41283,"registerId":"commonwealth-F2006B02061-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AA-5/3 - Fuel Tank Vent Lines -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,3\ntitle: Airworthiness Directive - AD/AA-5/3 - 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-5/3 Fuel Tank Vent Lines - Modification NK\n\nApplicability: All models with S/Nos. 0002 to 0045. Document:  American Aviation SB No. 128.\n\nCompliance: Before issue of a Certificate of Airworthiness.\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":2155},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains its original limited scope, targeting only the specific fuel tank vent line modification for early AA-5 series aircraft as originally intended. There is no evidence of scope creep or expansion beyond the initial safety issue addressed."},"complexity_factors":["Extremely short text (under 100 words of substantive content)","Single, unconditional compliance requirement","Narrow applicability limited to specific serial number range (0002-0045)","No defined terms, exceptions, or nested conditions within the directive text","Only one external reference (to American Aviation Service Bulletin No. 128)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for aircraft.\n\n**Who it affects:**\nOwners and operators of Gulfstream AA-5 series aeroplanes (also sold as Grumman American or American Aviation AA-5) with serial numbers 0002 through 0045.\n\n**What it requires:**\nThese aircraft must have their **fuel tank vent lines modified** according to the technical instructions in American Aviation Service Bulletin No. 128. This modification prevents fuel system problems such as dangerous pressure build-ups or leaks.\n\n**When it must be done:**\nBefore the aircraft can be issued a **Certificate of Airworthiness** (the official safety certificate required to fly legally).\n\n**Why it matters:**\nFuel tank vents are essential for safe fuel flow. This directive ensures these specific early-production aircraft meet critical safety standards before returning to or entering service."}},"importantCases":[],"_links":{"self":"/api/acts/ad-aa-5-3-fuel-tank-vent-lines-modification","history":"/api/acts/ad-aa-5-3-fuel-tank-vent-lines-modification/history","analysis":"/api/acts/ad-aa-5-3-fuel-tank-vent-lines-modification/analysis","conflicts":"/api/acts/ad-aa-5-3-fuel-tank-vent-lines-modification/conflicts","importantCases":"/api/acts/ad-aa-5-3-fuel-tank-vent-lines-modification/important-cases","documents":"/api/acts/ad-aa-5-3-fuel-tank-vent-lines-modification/documents"}}