{"id":"F2006B08670","name":"AD/CT58/12 - Lube and Scavenge Pump","slug":"ad-ct58-12-lube-and-scavenge-pump","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51768,"registerId":"commonwealth-F2006B08670-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CT58/12 - Lube and Scavenge Pump","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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  General Electric Turbine Engines - CT58 Series\n\n \n\nAD/CT58/12 Lube and Scavenge Pump 9/85\n\nApplicability: CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1 and CT58-140-2.\n\n \n\nDocument: General Electric Alert SB (CT58) A72-157; or AD/GE-T/34\n\nCompliance: As detailed in the requirement document.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1985 (as indicated by '9/85' in the identifier). It addresses a specific technical issue with specific engine models. There is no evidence of scope creep; it remains tightly focused on its original safety purpose regarding lube and scavenge pump maintenance."},"complexity_factors":["Very short document (approximately 150 words)","No defined terms section — relies entirely on external technical references","Single operational requirement: comply with referenced service bulletin","No conditional logic, exceptions, or nested provisions","Cross-references only to external technical documents (GE Alert SB and US AD), not to other legislative provisions","Straightforward applicability clause listing specific engine models"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nThis directive (AD/CT58/12) requires specific maintenance or inspection actions on **lubrication and scavenge pumps** in certain General Electric CT58 series turbine engines used in aircraft.\n\n**Who it affects:**\n- Aircraft operators or owners with engines models **CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, or CT58-140-2**\n- Maintenance organisations servicing these engines\n\n**Why it matters:**\nLube and scavenge pumps are critical for engine oil circulation. Failures can cause catastrophic engine damage or in-flight shutdowns. This AD mandates compliance with a General Electric Alert Service Bulletin (A72-157) or an equivalent US directive (AD/GE-T/34) to address a known safety issue.\n\n**Key point:** Compliance is **mandatory** — operators must follow the detailed instructions in the referenced technical documents by the specified deadlines."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD, as published, applies to a specified set of CT58 engine models and requires compliance with the actions in the referenced GE documents. The instrument text does not indicate any change from a previously stated scope; it identifies applicability, the technical source documents, and directs compliance \"as detailed in the requirement document\" (Applicability; Document; Compliance). There is no statement within this text that alters or narrows that applicability."},"complexity_factors":["Narrow and clearly listed applicability (five CT58 model variants) reduces interpretive complexity (Applicability).","Substantive work and procedures are deferred to an external manufacturer document (General Electric Alert SB A72-157 or AD/GE-T/34), creating a dependence on that document for operational detail (Document; Compliance).","The AD text is brief and procedural; lack of in-text detail increases the need to obtain and interpret the referenced service bulletin for full compliance planning (Compliance).","Regulatory authority and enforcement are standard (Civil Aviation Regulations 1998, Part 39 - 106 via CASA), so legal basis is straightforward (header).","Potential variation in cost and downtime across operators because the AD does not set timeframes, parts lists or labour estimates — these are in the requirement document (Compliance)."],"plain_english_summary":"This AD, issued under the Civil Aviation Regulations, mandates that owners, operators and maintenance organisations of specified GE CT58 engine models follow the corrective/inspection actions set out in General Electric Alert SB A72‑157 or AD/GE‑T/34 to address the lube and scavenge pump issue. Compliance is compulsory and the affected parties bear the costs, downtime and logistic consequences; technical details and timing are contained in the referenced GE documents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ct58-12-lube-and-scavenge-pump","history":"/api/acts/ad-ct58-12-lube-and-scavenge-pump/history","analysis":"/api/acts/ad-ct58-12-lube-and-scavenge-pump/analysis","conflicts":"/api/acts/ad-ct58-12-lube-and-scavenge-pump/conflicts","importantCases":"/api/acts/ad-ct58-12-lube-and-scavenge-pump/important-cases","documents":"/api/acts/ad-ct58-12-lube-and-scavenge-pump/documents"}}