{"id":"F2006B08987","name":"AD/DHA-3/4 - Fuel Tank Vent - Modification","slug":"ad-dha-3-4-fuel-tank-vent-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52613,"registerId":"commonwealth-F2006B08987-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHA-3/4 - Fuel Tank Vent - Modification","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)  DHA-3 (Drover) Series Aeroplanes\n\n \n\nAD/DHA-3/4 Fuel Tank Vent - Modification 11/52\n\nApplicability: All models.\n\n \n\nDocument: 1. DH Mod. DRO 37; or\n\n \n\n2. DH TNS CT(A3) No. 48; or 3. ANO 105.1.14.14.5.5\n\nCompliance: Forthwith.\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":2665},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope—mandating a specific safety modification to the fuel tank vent system of DHA-3 Drover aircraft. There is no evidence of expansion beyond the original airworthiness safety purpose."},"complexity_factors":["Single, unambiguous compliance action (modify fuel tank vent)","Only three alternative technical reference documents provided","No exceptions, exemptions, or conditional logic","Immediate compliance deadline ('forthwith') with no transitional arrangements","Very short document length (less than one page)"],"plain_english_summary":"This Airworthiness Directive requires all owners/operators of DHA‑3 Drover aeroplanes to modify the fuel‑tank vent system forthwith — before the next flight — to eliminate risk of pressure build‑up, fuel flow interruption, or leakage. Compliance must follow one of the three specified de Havilland technical documents or the Air Navigation Order. It addresses an immediate safety hazard to flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dha-3-4-fuel-tank-vent-modification","history":"/api/acts/ad-dha-3-4-fuel-tank-vent-modification/history","analysis":"/api/acts/ad-dha-3-4-fuel-tank-vent-modification/analysis","conflicts":"/api/acts/ad-dha-3-4-fuel-tank-vent-modification/conflicts","importantCases":"/api/acts/ad-dha-3-4-fuel-tank-vent-modification/important-cases","documents":"/api/acts/ad-dha-3-4-fuel-tank-vent-modification/documents"}}