{"id":"F2006B08512","name":"AD/CF700/8 - Fan Centre Vent System","slug":"ad-cf700-8-fan-centre-vent-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51242,"registerId":"commonwealth-F2006B08512-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CF700/8 - Fan Centre Vent System","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/CF700/8 Fan Centre Vent System 9/85\n\nApplicability: All CF700-2C, -2D and -2D-2. Document:  General Electric SB (CF700) 79-8; or\n\nAD/GE-T/20.\n\n \n\nCompliance: Before installation in an aircraft following next hot end inspection or engine reconditioning completed after 28 January 1972, whichever occurs first.\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 (indicated by '9/85' in the title). It addresses one specific technical issue (Fan Centre Vent System) on a narrow range of engine models. There is no evidence of scope creep; it remains tightly focused on its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 engine models specified in applicability","Single compliance requirement with clear trigger events","No defined terms section","No cross-references to other legislation (only references to manufacturer Service Bulletin and another AD)","Simple conditional logic: 'whichever occurs first' with a single date threshold"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **General Electric CF700 series jet engines** (models CF700-2C, -2D, and -2D-2).\n\n**What it requires:**\nBefore any of these engines can be installed in an aircraft, the **Fan Centre Vent System** must be inspected or modified. This must happen:\n- After the engine's next \"hot end inspection\" (a major check of the hot section of the engine), **or**\n- After any engine reconditioning,\n- Whichever comes first, **provided** that work was completed after 28 January 1972.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. They typically address design defects, wear patterns, or failure modes discovered after engines enter service. This particular AD likely addresses a specific safety issue with how the fan centre vent system was originally designed or manufactured. Non-compliance means an engine cannot legally be installed on an Australian-registered aircraft.\n\n**Who it affects:**\n- Aircraft operators using CF700 engines (common in some business jets)\n- Maintenance organisations (MROs) overhauling these engines\n- Owners of aircraft with these engine models"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text contains no indication that the instrument's scope has been altered from an earlier version. It sets applicability (specific CF700 models), specifies the external technical document to be followed, and prescribes a timing condition for compliance. The instrument does not itself record any amendment or narrowing/widening of scope within the provided text."},"complexity_factors":["Narrow technical scope limited to specific engine models (Applicability)","Compliance tied to a conditional, event-triggered timing (next hot end inspection or engine reconditioning completed after 28 January 1972) which requires accurate maintenance records (Compliance)","Substantive technical steps are not included in the directive itself but are contained in an external service bulletin or alternative AD, creating dependence on external documents for implementation (Document)","Historic date reference (28 January 1972) may require interpreting past maintenance histories for applicability (Compliance)","No enforcement, penalty or procedural detail in the text increases uncertainty about administrative follow-up"],"plain_english_summary":"This directive requires owners, operators and maintenance organisations of CF700-2C/‑2D/‑2D‑2 engines to carry out the fan‑centre vent modification/inspection per General Electric Service Bulletin CF700 79‑8 (or AD/GE‑T/20). Work must be completed before the engine’s next installation after any hot‑end inspection or engine reconditioning carried out after 28 January 1972. It matters because it creates a mandatory, event‑triggered maintenance action, shifting cost, scheduling and record‑keeping burdens to operators and independent shops."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf700-8-fan-centre-vent-system","history":"/api/acts/ad-cf700-8-fan-centre-vent-system/history","analysis":"/api/acts/ad-cf700-8-fan-centre-vent-system/analysis","conflicts":"/api/acts/ad-cf700-8-fan-centre-vent-system/conflicts","importantCases":"/api/acts/ad-cf700-8-fan-centre-vent-system/important-cases","documents":"/api/acts/ad-cf700-8-fan-centre-vent-system/documents"}}