{"id":"F2006B08513","name":"AD/CF700/9 - Turbine Casing Aft Flange","slug":"ad-cf700-9-turbine-casing-aft-flange","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51245,"registerId":"commonwealth-F2006B08513-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CF700/9 - Turbine Casing Aft Flange","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/CF700/9 Turbine Casing Aft Flange 9/85\n\nApplicability: All CF700-2C engines with turbine casings P/N 6003 T47G02, and All CF700-2D and -2D-2 engines with turbine casings P/N 6006T83G01.\n\n \n\nDocument: General Electric Alert SB (CF700) A72-106 including Addendum 1; or AD/GE-T/21A.\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":{"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 defect in specific engine models. It has not expanded beyond its original purpose of addressing the turbine casing aft flange issue."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 defined applicability criteria (engine models and part numbers)","Single cross-reference to external technical document (GE Alert SB)","No conditional logic, exceptions, or nested provisions","Standardised AD format — boilerplate structure with minimal variation","No interpretation section or defined terms"],"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 maintenance or inspection actions on certain aircraft engines to keep them safe to fly.\n\n**What it does:**\n- Orders owners and operators of specific General Electric CF700 turbine engines to inspect or repair the **turbine casing aft flange** (the rear mounting ring of the engine's hot section).\n- Applies to two engine models: CF700-2C and CF700-2D/-2D-2, but only those with specific part numbers for their turbine casings.\n\n**Who it affects:**\n- Airlines, charter operators, or private owners flying aircraft with these specific GE CF700 engines (commonly used on business jets like the Falcon 20).\n- Maintenance organisations servicing these engines.\n\n**Why it matters:**\n- The \"aft flange\" is a critical structural component. If it cracks or fails, it could lead to catastrophic engine damage or loss of aircraft control.\n- Compliance is **legally mandatory**. You cannot fly the aircraft until the work is done.\n- The directive references a General Electric Service Bulletin (a manufacturer's technical instruction) which contains the actual inspection/repair steps.\n\n**Key point:** This document doesn't contain the technical instructions itself — it simply makes compliance with GE's Alert Service Bulletin A72-106 (or an earlier equivalent directive) compulsory under Australian law."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD sets a clear, limited scope in its own text: it applies to specified CF700 engine models with the listed turbine casing part numbers and requires compliance with the referenced GE Alert SB (including Addendum 1) or AD/GE-T/21A (Applicability; Document; Compliance). The document itself does not indicate any change to that scope from a prior instrument."},"complexity_factors":["Narrow, technical applicability by engine model and specific part numbers (Applicability).","No technical steps contained in the AD itself — mandatory actions are delegated to an external manufacturer Service Bulletin or alternate AD (Document; Compliance).","Reliance on obtaining and interpreting an external technical document (possible need to determine correct revision and Addendum 1).","Enforcement and interpretation sit within the Part 39 regulatory framework but technical specifics are supplied by the manufacturer, creating a two‑part compliance chain (header; Document).","Potential operational disruption and costs to operators are not quantified in the AD and must be determined from the requirement document (Compliance)."],"plain_english_summary":"What this directive does (mechanics)\n\n- This Airworthiness Directive (AD) applies to a defined set of General Electric CF700 turbine engines and requires compliance with a separately published technical document. The AD names the affected engines by model and by turbine casing part number (Applicability). It then points to a General Electric Alert Service Bulletin A72-106 (including Addendum 1) or an alternative document AD/GE-T/21A as the requirement document that contains the technical actions to be taken (Document). The AD states that compliance must be carried out “as detailed in the requirement document” (Compliance).\n\nWho it affects\n\n- Operators, owners and maintenance organisations responsible for CF700-2C engines fitted with turbine casing P/N 6003 T47G02, and CF700-2D and -2D-2 engines fitted with turbine casing P/N 6006T83G01 (Applicability). The Civil Aviation Safety Authority (CASA) is the regulatory originator listed in the schedule heading (Civil Aviation Regulations 1998, Part 39).\n\nWhy it matters (purpose claims and operational test)\n\n- The AD makes compliance with the referenced GE technical document mandatory for the listed engines. The text does not include a descriptive rationale or the specific corrective actions; instead it delegates the technical specification to the manufacturer’s Alert Service Bulletin or the alternate AD (Document; Compliance). That means the safety objective, if any, is expressed through the referenced document rather than in the AD text itself.\n\nPractical implications, incentives and trade-offs\n\n- Who pays and who decides: the owners/operators and their maintenance providers are responsible for carrying out the required steps because the AD applies to the listed engines and requires compliance with the specified documents (Applicability; Compliance). The AD does not state that the regulator will pay or subsidise any work; it simply prescribes that the requirement document must be followed.\n\n- Compliance burden and information access: the AD contains minimal technical detail and requires retrieval of the referenced GE Alert SB A72-106 (including Addendum 1) or AD/GE-T/21A to learn what inspections, repairs, or replacements are required (Document). That creates a dependency on an external technical document for operational detail and cost estimation.\n\n- Incentives and opportunity costs: complying with the referenced document will impose time, labour and parts costs on operators (the AD requires following the document but does not specify costs) and may require engines to be taken out of service while work is done (Compliance). Those resource demands are the immediate opportunity cost to operators who must choose when and how to schedule the mandated work.\n\n- Bureaucratic discretion and enforcement: the AD is presented under the Civil Aviation Regulations Part 39 schedule of Airworthiness Directives, which makes the referenced actions mandatory for the listed engines; interpretation and enforcement would rest with the responsible regulatory authority as per that regulatory framework (Civil Aviation Regulations 1998, Part 39). The AD itself delegates technical content to the manufacturer’s SB or the alternate AD, so technical judgment about what to do in specific cases is provided by those documents rather than in the AD text.\n\n- Effects on private choice and market participants: the AD constrains private decision‑making for owners/operators of the listed engines by requiring specified maintenance or corrective actions as set out in the external document. Independent maintenance providers will need access to the referenced documents to perform work. The AD does not itself change ownership rights or the contractual terms between operators and maintenance providers; it simply mandates compliance with the technical instructions referenced.\n\nRisks and implementation notes\n\n- The AD’s short form and reliance on a separate technical bulletin mean that operators must obtain and follow the correct version of the referenced document (Document). Any uncertainty about which revision applies or how to apply its instructions could create implementation risk, requiring clarification from the regulator or the manufacturer.\n\nRelevant text citations\n\n- Applicability: identifies the exact engine models and turbine casing part numbers required to comply (Applicability).\n- Document: lists General Electric Alert SB A72-106 including Addendum 1; or AD/GE-T/21A as the requirement documents to be followed (Document).\n- Compliance: requires compliance “as detailed in the requirement document” (Compliance).\n- Regulatory basis: the AD is published under the Civil Aviation Regulations 1998, Part 39 schedule of Airworthiness Directives (header)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf700-9-turbine-casing-aft-flange","history":"/api/acts/ad-cf700-9-turbine-casing-aft-flange/history","analysis":"/api/acts/ad-cf700-9-turbine-casing-aft-flange/analysis","conflicts":"/api/acts/ad-cf700-9-turbine-casing-aft-flange/conflicts","importantCases":"/api/acts/ad-cf700-9-turbine-casing-aft-flange/important-cases","documents":"/api/acts/ad-cf700-9-turbine-casing-aft-flange/documents"}}