{"id":"F2006B02235","name":"AD/AL 250/12 Amdt 2 - Pc Filter Flanged Insert - Inspection","slug":"ad-al-250-12-amdt-2-pc-filter-flanged-insert-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41465,"registerId":"commonwealth-F2006B02235-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AL 250/12 Amdt 2 - Pc Filter Flanged Insert - Inspection","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 1/1971,Turbine engines,Allison Turbine Engines - 250 Series,Pc Filter Flanged Insert - Inspection,12 Amdt 2\ntitle: Airworthiness Directive - AD/AL 250/12 Amdt 2 - Pc Filter Flanged Insert - Inspection\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 250/12\n\nAmdt 2\n\n\nPc Filter Flanged Insert - Inspection 1/71\n\n \n\nApplicability: All “Blue Ribbon” Allison 250-C18 series. Document:  Allison 250 CEB-112, Rev. 1.\n\nCompliance: Within 25 hours’ time in service after 12 January 1971 and thereafter at intervals not exceeding 25 hours’ time in service until the insert is installed with EPOXYLITE 814.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing Airworthiness Directive (AD/AL 250/12), originally issued as Issue 1/1971. The scope remains tightly focused on the specific Pc filter flanged insert inspection requirement for the Allison 250-C18 engine series. As a safety directive, it has not expanded beyond its original purpose of addressing this specific airworthiness concern."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly used ('time in service' — standard aviation term for flight hours)","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Simple conditional logic: inspect at 25 hours, then every 25 hours, until condition met (EPOXYLITE 814 installation)","Single applicability criterion (Allison 250-C18 'Blue Ribbon' series)","Single technical reference document (Allison 250 CEB-112 Rev. 1)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). ADs are legally binding instructions that aircraft owners and operators must follow to fix unsafe conditions in aircraft, engines, or equipment.\n\n**What it does:** This specific AD requires inspection of a **Pc (pressure control) filter flanged insert** on certain **Allison 250-C18 series turbine engines** (the \"Blue Ribbon\" models). \n\n**Who it affects:** Anyone operating aircraft with these specific Allison 250-C18 engines — typically helicopter operators and some fixed-wing aircraft using these engines.\n\n**What must be done:**\n- **First inspection:** Within 25 hours of flying time after 12 January 1971\n- **Repeat inspections:** Every 25 hours of flying time thereafter\n- **When it stops:** Until the insert is replaced or treated with **EPOXYLITE 814** (a specific adhesive/sealing compound)\n\n**Why it matters:** The Pc filter flanged insert apparently has a defect that could cause engine failure or unsafe operation. The frequent 25-hour inspection interval suggests this was considered a serious, potentially catastrophic issue requiring close monitoring until a permanent fix (the EPOXYLITE treatment) is applied.\n\n**Key document reference:** Operators must follow **Allison Service Bulletin CEB-112, Revision 1** for the exact inspection procedure."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text is an amendment (Amdt 2) but does not include prior wording for comparison. Based solely on the text provided, the Directive specifies applicability to 'Blue Ribbon' Allison 250‑C18 series and prescribes a 25‑hour inspection interval until installation with EPOXYLITE 814. The supplied document does not show a change in scope from earlier versions, so there is no evidence here of a scope change."},"complexity_factors":["Narrow technical scope: applies only to 'Blue Ribbon' Allison 250‑C18 series (Applicability).","Simple, short recurring interval: inspections every 25 hours until modification (Compliance).","Clear terminating condition tied to a specific material/installation (EPOXYLITE 814) (Compliance).","Dependence on an external technical document for procedural detail (Allison 250 CEB‑112, Rev. 1) increases operational steps.","Regulatory formality: issued under Civil Aviation Regulations Part 39 (header), so enforcement and recordkeeping obligations apply.","Potential ambiguity in terminology (e.g. the exact meaning of 'Blue Ribbon' in this text) which could require interpretation or reference documents."],"plain_english_summary":"The directive (CASA, Part 39) requires operators of \"Blue Ribbon\" Allison 250‑C18 engines to inspect the Pc Filter flanged insert within 25 hours’ TIS after 12 Jan 1971 and at ≤25‑hour intervals thereafter, following Allison 250 CEB‑112 Rev.1. Recurring inspections cease only when the insert is installed using EPOXYLITE 814. Operators bear the recurring inspection costs or a one‑time modification cost to terminate the inspection cycle."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al-250-12-amdt-2-pc-filter-flanged-insert-inspection","history":"/api/acts/ad-al-250-12-amdt-2-pc-filter-flanged-insert-inspection/history","analysis":"/api/acts/ad-al-250-12-amdt-2-pc-filter-flanged-insert-inspection/analysis","conflicts":"/api/acts/ad-al-250-12-amdt-2-pc-filter-flanged-insert-inspection/conflicts","importantCases":"/api/acts/ad-al-250-12-amdt-2-pc-filter-flanged-insert-inspection/important-cases","documents":"/api/acts/ad-al-250-12-amdt-2-pc-filter-flanged-insert-inspection/documents"}}