{"id":"F2006B09574","name":"AD/ENST 28/19 - Fuel Strainer Drain Valve - Modification","slug":"ad-enst-28-19-fuel-strainer-drain-valve-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54257,"registerId":"commonwealth-F2006B09574-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ENST 28/19 - Fuel Strainer Drain Valve - 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)  Enstrom F-28 Series Helicopters\n\n \n\nAD/ENST 28/19 Fuel Strainer Drain Valve - Modification 3/78\n\nApplicability: All models.\n\n \n\nRequirement: Modify the fuel strainer drain valve P/N K9000S-1A to return automatically to the closed position.\n\n \n\nNote: Incorporation of Forrestair Drawing No. FSA 78.1 is an acceptable means of compliance.\n\n \n\nCompliance: Within 100 hours time in service after 30 April 1978.\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":1403},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains tightly focused on its original purpose: correcting a specific safety defect in the fuel system of Enstrom F-28 helicopters. There is no evidence of scope creep or expansion into unrelated operational areas."},"complexity_factors":["Single, specific mechanical modification required","No cross-references to other legislation or sections","Simple compliance timeframe with no conditional exceptions","Only one defined part number and one optional means of compliance cited"],"plain_english_summary":"This directive mandates a safety fix for Enstrom F-28 helicopters. **Who it affects:** Owners and operators of these helicopters. **What it requires:** You must modify the fuel strainer drain valve (part number K9000S-1A) so that it automatically springs back to the closed position after being opened. This prevents the valve from being accidentally left open, which could cause fuel leaks or fire hazards. **When to comply:** Within 100 hours of flight time after 30 April 1978. **How to comply:** You can follow Forrestair Drawing No. FSA 78.1 as an approved method, or use another acceptable method that achieves the same safety outcome."}},"importantCases":[],"_links":{"self":"/api/acts/ad-enst-28-19-fuel-strainer-drain-valve-modification","history":"/api/acts/ad-enst-28-19-fuel-strainer-drain-valve-modification/history","analysis":"/api/acts/ad-enst-28-19-fuel-strainer-drain-valve-modification/analysis","conflicts":"/api/acts/ad-enst-28-19-fuel-strainer-drain-valve-modification/conflicts","importantCases":"/api/acts/ad-enst-28-19-fuel-strainer-drain-valve-modification/important-cases","documents":"/api/acts/ad-enst-28-19-fuel-strainer-drain-valve-modification/documents"}}