{"id":"F2006B08505","name":"AD/CF700/16 - Turbine Torque Rings and Compressor Driveshafts","slug":"ad-cf700-16-turbine-torque-rings-and-compressor-driveshafts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51221,"registerId":"commonwealth-F2006B08505-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CF700/16 - Turbine Torque Rings and Compressor Driveshafts","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nGeneral Electric Turbine Engines \\- CF700 Series\n\nAD/CF700/16 Turbine Torque Rings and Compressor Driveshafts 5/98\n\nApplicability: General Electric CF700 series turbine engines incorporating turbine torque rings and/or compressor driveshafts identified in General Electric Service Bulletin number (CF700) 72-155.\n\nRequirement: Replace affected turbine torque rings and compressor driveshafts in accordance with General Electric Service Bulletin number (CF700) 72-155.\n\nNote: FAA AD 97-25-08 also refers.\n\nCompliance: Affected turbine torque rings are to be replaced within 50 hours time in service or 60 days from the effective date of this Directive whichever occurs first.\n\nAffected compressor driveshafts are to be replaced within 300 hours time in service or 12 months from the effective date of this Directive whichever occurs first.\n\nThis airworthiness directive becomes effective 23 April 1998.\n\nBackground: This Directive is prompted by advice from the manufacturer that some turbine torque rings and compressor drive shafts were manufactured from contaminated material.\n\nFailure of a discrepant component could result in an uncontained engine failure.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope: addressing a specific manufacturing defect in specific engine parts. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, clearly defined applicability (CF700 series engines with specific parts)","Straightforward requirement: replace parts per manufacturer bulletin","Simple compliance structure with two clear deadlines based on flight hours or calendar time","No nested exceptions, conditional logic, or extensive cross-referencing beyond one FAA AD note","Minimal defined terms (relies on external manufacturer bulletin for part identification)","Short document (approximately 200 words)"],"plain_english_summary":"This CASA safety order requires owners/operators of aircraft with General Electric CF700 engines (with parts identified in GE Service Bulletin CF700-72-155) to replace turbine torque rings and compressor driveshafts made from contaminated material. The replacements are mandatory because part failure can cause uncontained engine failure endangering aircraft occupants. Compliance windows (from 23 April 1998) are 50 flight hours or 60 days for torque rings, and 300 flight hours or 12 months for driveshafts."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive adheres to its original safety-remedial objective: remove and replace contaminated components identified by the manufacturer. It does not expand to additional parts, activities, or longer-term regulatory controls beyond mandated replacement per the GE Service Bulletin."},"complexity_factors":["Narrow technical scope: applies only to CF700 engines with parts identified in GE Service Bulletin (CF700) 72-155.","Single mandatory remedial action: full replacement of specified turbine torque rings and compressor driveshafts (per the GE SB).","Short, concrete compliance windows increase operational urgency: torque rings (50 hours or 60 days) and driveshafts (300 hours or 12 months).","Reliance on manufacturer procedures (GE SB) for execution limits regulatory discretion but requires operators to follow external technical instructions.","Cost and logistics fall on engine owners/operators who must source parts and schedule maintenance (direct financial and operational burden).","Potential supply-chain and maintenance-scheduling friction for affected operators, especially where parts availability or shop capacity is constrained.","Safety-critical context raises enforcement priority but does not add legal complexity (no exemptions or discretionary relief in the text).","Cross-reference to FAA AD 97-25-08 indicates alignment with an existing foreign airworthiness action, simplifying bilateral compliance understanding."],"plain_english_summary":"This airworthiness directive requires operators of General Electric CF700 engines that contain turbine torque rings or compressor driveshafts identified in GE Service Bulletin (CF700) 72-155 to replace those specific parts. The regulator (Civil Aviation Safety Authority) mandates replacement procedures from the manufacturer because some parts were made from contaminated material. Operators must arrange and pay for the replacements within short service- or calendar-time limits to maintain airworthiness and avoid the risk of an uncontained engine failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf700-16-turbine-torque-rings-and-compressor-driveshafts","history":"/api/acts/ad-cf700-16-turbine-torque-rings-and-compressor-driveshafts/history","analysis":"/api/acts/ad-cf700-16-turbine-torque-rings-and-compressor-driveshafts/analysis","conflicts":"/api/acts/ad-cf700-16-turbine-torque-rings-and-compressor-driveshafts/conflicts","importantCases":"/api/acts/ad-cf700-16-turbine-torque-rings-and-compressor-driveshafts/important-cases","documents":"/api/acts/ad-cf700-16-turbine-torque-rings-and-compressor-driveshafts/documents"}}