{"id":"F2006B02023","name":"AD/AA-1/12 - Fuel Tank Vent Lines and Fuel Contents Gauge Lines - Modification","slug":"ad-aa-1-12-fuel-tank-vent-lines-and-fuel-contents-gauge-lines-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41245,"registerId":"commonwealth-F2006B02023-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AA-1/12 - Fuel Tank Vent Lines and Fuel Contents Gauge Lines - Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nGulfstream (Grumman American/ American Aviation) AA-1 Series Aeroplanes\n\nAD/AA-1/12 Fuel Tank Vent Lines and Fuel Contents\n\nGauge Lines \\- Modification\n\n  \n7/73\n\nApplicability: All models.\n\nRequirement: 1. Replace all PVC plastic hose connectors on the fuel tank venting system, and the fuel contents gauge system with fuel resistant rubber hose connectors.\n\n    2. Where practicable, bead the ends of the aluminium alloy vent lines where joined by the nose connectors.\n\n    3. Where hose connectors are used between adjoining aluminium alloy vent lines ensure that the end distance between the lines is no greater than 1/2\".\n\n    4. Replace all spring wire type hose clips on the fuel tank venting system and the fuel contents gauge system with screw type hose clips.\n\nCompliance: Within 100 hours time in service after 31 August 1973.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2889},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow focus on hardware replacement for specific fuel line systems in the AA-1 aircraft series. No expansion beyond the original safety-critical maintenance requirement is evident."},"complexity_factors":["Short, discrete list of four specific mechanical tasks","Single conditional qualifier ('where practicable')","Limited technical aviation terminology (beading, hose clips, time in service)","No cross-references to other legislation or interpretation section"],"plain_english_summary":"This AD requires Gulfstream AA-1 (formerly Grumman American/American Aviation) operators to modify fuel tank vent and fuel contents gauge lines: replace PVC hose connectors with fuel‑resistant rubber, swap spring wire clips for screw‑type clips, bead aluminum vent line ends where practicable, and limit metal‑end gaps to ≤½\" where rubber hoses join aluminum lines.\n\nIt targets preventing connector/clip failure that can cause fuel leaks, vapor loss, or erroneous fuel indications."}},"importantCases":[],"_links":{"self":"/api/acts/ad-aa-1-12-fuel-tank-vent-lines-and-fuel-contents-gauge-lines-modification","history":"/api/acts/ad-aa-1-12-fuel-tank-vent-lines-and-fuel-contents-gauge-lines-modification/history","analysis":"/api/acts/ad-aa-1-12-fuel-tank-vent-lines-and-fuel-contents-gauge-lines-modification/analysis","conflicts":"/api/acts/ad-aa-1-12-fuel-tank-vent-lines-and-fuel-contents-gauge-lines-modification/conflicts","importantCases":"/api/acts/ad-aa-1-12-fuel-tank-vent-lines-and-fuel-contents-gauge-lines-modification/important-cases","documents":"/api/acts/ad-aa-1-12-fuel-tank-vent-lines-and-fuel-contents-gauge-lines-modification/documents"}}