{"id":"F2006B08504","name":"AD/CF700/15 - Fan Guard Replacement","slug":"ad-cf700-15-fan-guard-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51219,"registerId":"commonwealth-F2006B08504-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CF700/15 - Fan Guard Replacement","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/CF700/15 Fan Guard Replacement 11/97\n\nApplicability: General Electric CF700 series turbine engines.\n\n \n\nRequirement: Replace existing fan guards in accordance with General Electric Service Bulletin number (CF700) 72-154.\n\n \n\nNote: FAA AD 97-13-10 also refers.\n\n \n\nCompliance: No later than 9 October 1999.\n\n \n\nThis airworthiness directive becomes effective on 9 October 1997.\n\n \n\nBackground: This directive is prompted by reports of uncontained fan blade failures following engine overspeed events.\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":2,"scope_assessment":{"changed":false,"description":"The directive’s scope is limited and specific: it targets the replacement of fan guards on GE CF700 series engines and requires compliance with GE Service Bulletin CF700-72-154 by a fixed date. The text does not indicate any expansion or narrowing of that scope from its stated purpose; it remains a targeted corrective measure prompted by reports of uncontained fan blade failures (Applicability; Requirement; Background; Compliance)."},"complexity_factors":["Narrow technical scope: applies only to General Electric CF700 series engines (Applicability).","Single mandated action: replace fan guards per a specific manufacturer service bulletin (Requirement).","Fixed compliance deadline and effective date create a clear temporal obligation (Compliance; Effective date).","Delegation of technical detail to an external document (GE Service Bulletin CF700-72-154) requires users to consult another source for the actual procedures (Requirement).","Reference to an external regulatory document (FAA AD 97-13-10) introduces cross-jurisdictional linkage but not substantive complexity within the directive (Note).","The directive does not specify funding, exemptions, enforcement mechanics or operational logistics, leaving procedural and cost details to be resolved by affected parties (Requirement; Compliance)."],"plain_english_summary":"What this instrument does (mechanical change):\n\n- Requires that the existing fan guards on General Electric CF700 series turbine engines be replaced in accordance with General Electric Service Bulletin (CF700) 72-154. (Requirement; Applicability)\n- Sets a compliance deadline of no later than 9 October 1999 and states the directive becomes effective on 9 October 1997. (Compliance; Effective date)\n\nWhy the regulator issued it (official rationale):\n\n- The directive is prompted by reports of uncontained fan blade failures following engine overspeed events. (Background)\n- The instrument also cross-references the FAA airworthiness directive 97-13-10. (Note)\n\nWho is affected and who must act:\n\n- Operators or owners of aircraft fitted with General Electric CF700 series engines are the parties subject to this obligation: the directive applies to that engine family and requires replacement of the fan guards per the manufacturer’s service bulletin. (Applicability; Requirement)\n\nHow it works in practice and immediate legal mechanics:\n\n- The directive does not set out new design details itself; it delegates the technical specification and steps for replacement to General Electric’s Service Bulletin CF700-72-154, and makes compliance with that bulletin compulsory for affected engines. (Requirement)\n- A fixed date by which the replacement must be completed is specified (no later than 9 October 1999). (Compliance)\n\nSource-claimed purpose and a practical check against implementation issues:\n\n- The directive’s stated purpose is safety: to address the hazard of uncontained fan blade failures after overspeed events. That stated purpose is set out in the Background. (Background)\n- Practical consequences the text makes explicit: a mandatory technical action (fan guard replacement) tied to a manufacturer’s instruction and a hard deadline. (Requirement; Compliance)\n\nWhat the instrument does not specify (limits in the text):\n\n- The directive does not, within the text provided, specify who bears the cost, how the work is to be funded, any exemptions or alternative corrective actions, or the enforcement mechanism beyond making the replacement mandatory. (Requirement; Compliance)\n- The directive does not itself describe parts availability, maintenance downtime, or how service providers are to be engaged; it simply makes the service bulletin the required method. (Requirement)\n\nIncentives, trade-offs and likely effects (text-grounded):\n\n- Incentives and responsibilities: the obligation shifts the immediate compliance task to operators/owners of CF700 engines, who must follow the GE service bulletin by the stated date. (Applicability; Requirement; Compliance)\n- Trade-offs and opportunity costs signalled by the instrument: operators must prioritise the replacement work by the deadline, which will use maintenance resources and calendar time otherwise available for other tasks; those resource costs are implied by the mandatory replacement and deadline but are not quantified in the text. (Requirement; Compliance)\n- Regulatory coordination: the directive aligns CASA’s requirement with existing manufacturer guidance and references the FAA AD, meaning the technical method and regulatory intent are linked to external documents rather than fully specified in the directive itself. (Requirement; Note)\n\nNet effect, as a matter of law: the directive creates a discrete, time-bound technical compliance obligation for owners/operators of GE CF700 engines to replace fan guards per the cited GE Service Bulletin, motivated by reported safety incidents. (Applicability; Requirement; Background; Compliance)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on fan guard replacement for one engine series. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 substantive requirement (replace fan guards)","Single cross-reference to a technical service bulletin (external document, not legislative text)","No defined terms section","No conditional logic or exceptions","Simple temporal compliance structure (single deadline)","Clear applicability statement (specific engine series only)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft parts, but with legal force. If you don't comply, you can't legally fly the aircraft.\n\n**What it does:** It orders owners and operators of **General Electric CF700 series turbine engines** to replace their existing fan guards. The replacement must follow specific instructions in a General Electric Service Bulletin (technical document) numbered CF700-72-154.\n\n**Why it matters:** The old fan guards were failing to contain fan blades when engines experienced \"overspeed events\" (when the engine spins too fast, potentially causing blades to break off). Broken fan blades flying around inside or outside an engine can cause catastrophic damage — to the aircraft, passengers, and people on the ground. This directive prevents that by ensuring stronger/re-designed guards are installed.\n\n**Who must act:** Anyone operating aircraft with these specific GE engines — typically business jets and some military aircraft conversions.\n\n**Key deadlines:**\n- **Effective date:** 9 October 1997 (when the rule became active)\n- **Compliance deadline:** 9 October 1999 (when the replacement had to be finished)\n\n**International link:** This mirrors an American FAA directive (AD 97-13-10), showing how aviation safety standards are coordinated globally."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf700-15-fan-guard-replacement","history":"/api/acts/ad-cf700-15-fan-guard-replacement/history","analysis":"/api/acts/ad-cf700-15-fan-guard-replacement/analysis","conflicts":"/api/acts/ad-cf700-15-fan-guard-replacement/conflicts","importantCases":"/api/acts/ad-cf700-15-fan-guard-replacement/important-cases","documents":"/api/acts/ad-cf700-15-fan-guard-replacement/documents"}}