{"id":"F2006B02236","name":"AD/AL 250/13 - Improved Indicating Magnetic Drain Plugs - Introduction","slug":"ad-al-250-13-improved-indicating-magnetic-drain-plugs-introduction","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41466,"registerId":"commonwealth-F2006B02236-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AL 250/13 - Improved Indicating Magnetic Drain Plugs - Introduction","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 10/1970,Turbine engines,Allison Turbine Engines - 250 Series,Improved Indicating Magnetic Drain Plugs - Introduction,13\ntitle: Airworthiness Directive - AD/AL 250/13 - Improved Indicating Magnetic Drain Plugs - Introduction\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Allison Turbine Engines - 250 Series\n\n \n\nAD/AL 250/13 Improved Indicating Magnetic Drain Plugs - Introduction\n\n\n10/70\n\n \n\nApplicability: All 250-C18 engines with S/Nos. 800001 to 800165 and CAE 800266 to 801575 (Approx.) and All 250-C18A series with S/Nos. CAE 800166 to 800265, 801600 to 801799, and 801900 to 801950 (Approx.).\n\n \n\nDocument: Allison 250 CEB No. 109.\n\n \n\nCompliance: Within 100 hours’ time in service after 30 October 1970.\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":1806},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is the original directive establishing the magnetic drain plug requirement for specific Allison engines. The scope remains precisely limited to the identified engine models and serial numbers, with no indication of expansion beyond the original safety intent."},"complexity_factors":["Narrow applicability restricted to specific engine models and discrete serial number ranges","Single compliance action with reference to external technical standard (Allison 250 CEB No. 109)","No nested exceptions, conditional provisions, or intricate cross-referencing"],"plain_english_summary":"**What this does:**\nThis airworthiness directive mandates the installation of improved magnetic drain plugs on specific Allison turbine engines used in aircraft.\n\n**Who it affects:**\nAircraft operators and owners with Allison 250-C18 or 250-C18A engines bearing these specific serial numbers:\n- **250-C18:** S/Nos. 800001 to 800165 and CAE 800266 to 801575 (Approx.)\n- **250-C18A:** S/Nos. CAE 800166 to 800265, 801600 to 801799, and 801900 to 801950 (Approx.)\n\n**Why it matters:**\nMagnetic drain plugs trap metal particles in engine oil, acting as an early warning system for internal engine damage. The improved design provides better detection of metal debris, helping prevent catastrophic engine failure and maintaining airworthiness.\n\n**Requirements:**\nYou must install the improved drain plugs within 100 hours of engine operation after 30 October 1970, following the technical instructions in **Allison 250 CEB No. 109** (the manufacturer's service bulletin)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al-250-13-improved-indicating-magnetic-drain-plugs-introduction","history":"/api/acts/ad-al-250-13-improved-indicating-magnetic-drain-plugs-introduction/history","analysis":"/api/acts/ad-al-250-13-improved-indicating-magnetic-drain-plugs-introduction/analysis","conflicts":"/api/acts/ad-al-250-13-improved-indicating-magnetic-drain-plugs-introduction/conflicts","importantCases":"/api/acts/ad-al-250-13-improved-indicating-magnetic-drain-plugs-introduction/important-cases","documents":"/api/acts/ad-al-250-13-improved-indicating-magnetic-drain-plugs-introduction/documents"}}