{"id":"F2006B08669","name":"AD/CT58/11 - Oil Cooler to Fuel Filter Hose","slug":"ad-ct58-11-oil-cooler-to-fuel-filter-hose","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51765,"registerId":"commonwealth-F2006B08669-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CT58/11 - Oil Cooler to Fuel Filter Hose","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/CT58/11 Oil Cooler to Fuel Filter Hose 9/85\n\nApplicability: 1. CT58-100-2, 110-1, 110-2, 140-1, 140-1 Series A/L, and CT58-140-2 engines fitted with fuel hoses P/N 37C300486 P101, P102 and P103 manufactured before 1969; and\n\n \n\n2. All fuel hoses P/N 37C300486 P101, P102 and P103 manufactured prior to 1969 that are stocked as spares.\n\n \n\nDocument: General Electric SB (CT58) A73-69; or\n\n \n\nAD/GE-T/32.\n\n \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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical component (pre-1969 fuel hoses) in a specific engine family. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Very short document (under 200 words)","Only 3 defined part numbers and 6 engine models in applicability section","No conditional logic or nested exceptions","Single compliance requirement referencing external documents","No interpretation section or defined terms","Straightforward command structure: identify affected parts → reference technical document → comply"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific maintenance action on certain aircraft engines.\n\n**What it does:**\n- Orders inspection or replacement of specific fuel hoses (part numbers 37C300486 P101, P102, and P103) that were manufactured before 1969\n- These hoses connect the oil cooler to the fuel filter in General Electric CT58 series turbine engines\n\n**Who it affects:**\n- Operators of aircraft using CT58-100-2, 110-1, 110-2, 140-1, 140-1 Series A/L, and CT58-140-2 engines\n- Anyone holding spare fuel hoses with those part numbers manufactured before 1969\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety orders. Non-compliance means an aircraft cannot fly legally.\n- This AD addresses a specific technical defect or wear pattern in aging fuel hoses that could pose a fire or engine failure risk.\n- The directive references a General Electric Service Bulletin (SB A73-69) or an earlier AD (AD/GE-T/32) for the exact technical steps required.\n\n**Key point:** The actual technical work isn't described in this document — operators must follow the referenced service bulletin or earlier AD to comply."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text sets a clear, narrow scope: specified CT58 engine variants fitted with the listed hose part numbers manufactured before 1969, and pre‑1969 spare hoses in stock (Applicability: 1; 2). The AD refers to an external requirement document for the remedial actions (Document; Compliance). There is no information in the supplied text indicating that the AD’s scope was changed from an earlier or original intent."},"complexity_factors":["Narrow technical applicability tied to specific engine models and exact part numbers (P/N 37C300486 P101, P102 and P103) and a manufacture date cutoff (before 1969) (Applicability: 1; 2).","Key procedural and timing details are not in the AD itself but in external documents (General Electric SB A73‑69 or AD/GE‑T/32), requiring operators to obtain and follow those documents (Document; Compliance).","Ambiguity in administrative terms: the AD does not define ‘manufactured before 1969’ dating standards or what constitutes ‘stocked as spares’, which can create interpretation and record‑checking burden (Applicability: 1; 2).","Lack of explicit compliance timeframe or alternative compliance pathways in the AD text increases reliance on regulator procedures and the referenced documents for enforcement and practical direction (Compliance).","Regulatory cross‑references (Part 39 schedule header and external AD/SB documents) add steps for users to trace authoritative instructions and enforcement mechanisms."],"plain_english_summary":"This Airworthiness Directive requires owners, operators and spare‑parts holders of certain General Electric CT58 engines to identify and take the actions specified for fuel hoses (P/Ns 37C300486 P101/P102/P103) manufactured before 1969.  \n\nCompliance must follow the detailed instructions in General Electric Service Bulletin A73‑69 or AD/GE‑T/32, obliging inspection, record checks and possible replacement—shifting maintenance, inventory and cost burdens to operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ct58-11-oil-cooler-to-fuel-filter-hose","history":"/api/acts/ad-ct58-11-oil-cooler-to-fuel-filter-hose/history","analysis":"/api/acts/ad-ct58-11-oil-cooler-to-fuel-filter-hose/analysis","conflicts":"/api/acts/ad-ct58-11-oil-cooler-to-fuel-filter-hose/conflicts","importantCases":"/api/acts/ad-ct58-11-oil-cooler-to-fuel-filter-hose/important-cases","documents":"/api/acts/ad-ct58-11-oil-cooler-to-fuel-filter-hose/documents"}}