{"id":"F2006B08480","name":"AD/CF6/38 - Stage 1 Fan Disk Inspection","slug":"ad-cf6-38-stage-1-fan-disk-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51157,"registerId":"commonwealth-F2006B08480-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CF6/38 - Stage 1 Fan Disk Inspection","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 \\- CF6 Series\n\nAD/CF6/38 Stage 1 Fan Disk Inspection 1/99 DM\n\nApplicability: General Electric Company CF6-6, \\-45, \\-50, \\-80A and 80C2 series turbofan engines with Stage 1 fan disks installed, identified by serial numbers (S/N) in the following GE Alert Service Bulletins (ASBs):\n\n    CF6-6 ASB 72-A996 Revision 4 dated 9 June 1998.\n\n    2. CF6-50 ASB 72-A988 Revision 6 dated 25 August 1998.\n\n    3. CF6-80A ASB 72-A565 Revision 5 dated 9 June 1998.\n\n    4. CF6-80C2 ASB 72-A478 Revision 4 dated 9 June 1998.\n\nThese engines are installed on, but not limited to, Boeing 747 and 767, Airbus 300 and 310, McDonnell Douglas DC-10 and MD-11 Series aircraft.\n\nRequirement: On fan disks affected by this Directive, perform an ultrasonic immersion inspection for cracks in accordance with the applicable alert service bulletin (as identified in the applicability section above), remove from service any disks found to be cracked and replace with serviceable components.\n\nCompliance: Before next flight after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 25 November 1998.\n\nNote: US FAA AD 98-22-06 Amendment 39-10853 refers.\n\nBackground: Stage 1 fan disks manufactured between late 1984 and early 1985 have been found to be cracked during routine shop inspections. The actions in this Directive are intended to prevent fan disk failures, due to cracks, which could result in an uncontained engine failure and damage to the aircraft. This Directive reflects a country of origin AD.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow, specific purpose: addressing a known manufacturing defect in particular engine components. It has not expanded beyond its initial safety-critical scope."},"complexity_factors":["Single, specific technical requirement with clear applicability criteria","Only 4 defined document references (the Alert Service Bulletins)","No nested conditional logic or exceptions","Straightforward compliance deadline (before next flight)","Short document (approximately 250 words)","Clear cause-and-effect relationship between the safety risk and required action"],"plain_english_summary":"Australia's Civil Aviation Safety Authority has issued an emergency safety order requiring airlines to perform immediate ultrasonic immersion inspections of Stage 1 fan disks in specific GE CF6 engines (CF6-6, -45, -50, -80A, -80C2) manufactured late 1984–early 1985. Any cracked disks must be removed and replaced before the aircraft may fly.\n\nThe directive follows discovery of cracks during maintenance, addresses risk of uncontained engine failure, and adopts an FAA emergency action."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive targets a specific set of Stage 1 fan disks (by engine type and serial numbers referenced in GE Alert Service Bulletins) and adopts the country-of-origin AD approach to address discovered cracks in disks manufactured in late 1984–early 1985. The text does not indicate any broadening or narrowing of scope beyond that original identification."},"complexity_factors":["Narrow technical scope: applies only to CF6-6, -45, -50, -80A and -80C2 engines with Stage 1 fan disks identified by serial numbers in specified GE Alert Service Bulletins (Applicability).","Single, clear mandated action: ultrasonic immersion inspection and removal/replacement of cracked disks (Requirement).","Urgent compliance timeframe: required before next flight after the effective date (Compliance) increases operational disruption risk.","Dependence on external documents: identification of affected serial numbers and inspection procedures requires consulting multiple GE ASBs (Applicability lists ASBs).","Operational cost and logistics: inspections and potential disk replacements create direct costs for operators and may require shop visits and spare parts.","Cross-reference to foreign regulator: alignment with US FAA AD 98-22-06 indicates harmonisation but requires checking another AD for related details (Note)."],"plain_english_summary":"This directive orders operators of certain General Electric CF6-6, -45, -50, -80A and -80C2 engines (identified by serial numbers in specified GE Alert Service Bulletins) to carry out an ultrasonic immersion inspection of Stage 1 fan disks and to remove and replace any disks found cracked. Compliance is mandatory before the next flight. The regulator cites discovered cracks in disks made in late 1984–early 1985 and says the inspections aim to prevent uncontained engine failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-38-stage-1-fan-disk-inspection","history":"/api/acts/ad-cf6-38-stage-1-fan-disk-inspection/history","analysis":"/api/acts/ad-cf6-38-stage-1-fan-disk-inspection/analysis","conflicts":"/api/acts/ad-cf6-38-stage-1-fan-disk-inspection/conflicts","importantCases":"/api/acts/ad-cf6-38-stage-1-fan-disk-inspection/important-cases","documents":"/api/acts/ad-cf6-38-stage-1-fan-disk-inspection/documents"}}