{"id":"F2006B08508","name":"AD/CF700/4 - Stage 1 Turbine Wheel","slug":"ad-cf700-4-stage-1-turbine-wheel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51229,"registerId":"commonwealth-F2006B08508-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CF700/4 - Stage 1 Turbine Wheel","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 - CF700 Series\n\n \n\nAD/CF700/4 Stage 1 Turbine Wheel 9/85\n\nApplicability: All CF700-2C fitted with Stage 1 turbine wheels P/N 634E58P4 with S/Nos. up to and including 5499, and all wheel assemblies P/N 841B690P6.\n\n \n\nDocument: General Electric SB (CF700) A72-70; or\n\n \n\nAD/GE-T/12.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument, as presented, sets out applicability (parts and serial numbers) and points to an external requirement document for the mandatory actions. There is no information in the supplied text indicating that the scope has been changed from an earlier version; therefore there is no evidence in this document of scope change."},"complexity_factors":["Reliance on external technical documents for required actions rather than specifying measures in the AD itself (Document; Compliance).","Precise applicability tied to specific part numbers and a serial-number cut-off, requiring operators to check parts records (Applicability).","Regulatory placement under Part 39 meaning enforcement and legal effect are governed by CASA procedures (header).","Lack of detail in the AD about the nature of required work or timing, creating operational uncertainty until the referenced document is consulted (Compliance)."],"plain_english_summary":"This CASA airworthiness directive mandates that owners/operators of specified General Electric CF700-2C engines (Stage 1 turbine wheels P/N 634E58P4, S/N up to 5499, and wheel assemblies P/N 841B690P6) comply with actions set out in the referenced GE service bulletin or AD.\n\nIt matters because it legally obliges those operators to obtain and implement the external document’s inspections/repairs, with compliance costs borne by the owners/operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific known defect in specific engine components. It has not expanded beyond its original purpose of ensuring airworthiness of the identified turbine wheels."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section — relies entirely on external technical documents (Service Bulletin A72-70 and AD/GE-T/12) for substantive requirements","Simple conditional logic: applicability determined by two specific part numbers and a serial number range","No cross-references to other legislation beyond the two named documents","Single compliance pathway with alternative reference documents","No exceptions, exemptions, or nested conditions within the text itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific inspections or actions on certain aircraft engines to prevent accidents.\n\n**What it does:**\n- Mandates safety work on **General Electric CF700-2C turbine engines** used in aircraft\n- Specifically targets **Stage 1 turbine wheels** (a critical rotating component in jet engines that extracts energy from hot gases)\n- Applies to wheels with part numbers **634E58P4** (serial numbers up to 5499) and **841B690P6**\n\n**Who it affects:**\n- Aircraft operators, owners, and maintenance organisations using these specific engine models\n- Anyone responsible for keeping these engines airworthy (legal to fly)\n\n**Why it matters:**\nTurbine wheels spin at extreme speeds and temperatures. If they fail, the engine can destroy itself and potentially damage the aircraft. This AD likely addresses a known defect, wear pattern, or failure risk discovered by the manufacturer (General Electric) or through incident reports. Compliance is **legally mandatory** — you cannot fly the aircraft until the required work is done.\n\n**How to comply:**\nFollow the instructions in either:\n- General Electric Service Bulletin (CF700) A72-70, **or**\n- AD/GE-T/12 (an earlier related directive)\n\nThese documents detail exactly what inspections, replacements, or modifications must be performed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf700-4-stage-1-turbine-wheel","history":"/api/acts/ad-cf700-4-stage-1-turbine-wheel/history","analysis":"/api/acts/ad-cf700-4-stage-1-turbine-wheel/analysis","conflicts":"/api/acts/ad-cf700-4-stage-1-turbine-wheel/conflicts","importantCases":"/api/acts/ad-cf700-4-stage-1-turbine-wheel/important-cases","documents":"/api/acts/ad-cf700-4-stage-1-turbine-wheel/documents"}}