{"id":"F2006B08478","name":"AD/CF6/35 - Compressor Rear Frame Midflange","slug":"ad-cf6-35-compressor-rear-frame-midflange","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51152,"registerId":"commonwealth-F2006B08478-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CF6/35 - Compressor Rear Frame Midflange","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/CF6/35 Compressor Rear Frame Midflange 13/95\n\nApplicability: General Electric CF6-80A engines.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 95-17-16 Amendment 39-9347.\n\nNote: GE CF6-80A SB No. 72-593 Revision 2 also refers.\n\nCompliance: Effective 7 December 1995:\n\nUnless previously accomplished, as specified in the Requirement Document, except for paragraph (b) which has a revised compliance date of 30 June 1997.\n\nNote: Paragraph (b) requires replacement or rework of the CRF midflange which is considered terminating action for the inspections.\n\nBackground: General Electric has advised that axial cracks have been found in the CRF midflanges and in one event a CRF midflange crack resulted in flange separation and a subsequent rejected take-off.\n\nThis Directive mandates a repetitive on-wing eddy current inspection or optional on- wing fluorescent particle inspection (FPI), repetitive shop level FPI of the CRF midflange area and replacement or rework of the CRF midflange.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific engine model. It has not expanded beyond its original purpose of mandating inspections and repairs for cracked CRF midflanges."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term used (CRF midflange, explained in context)","Single cross-reference to foreign legislation (FAA AD 95-17-16) and one service bulletin","Simple conditional structure: inspect repeatedly OR replace/rework to end inspections","Clear compliance dates with one exception noted","No nested exceptions or complex logical operators"],"plain_english_summary":"This CASA Airworthiness Directive mandates repeated non‑destructive inspections (eddy current or fluorescent particle) of the Compressor Rear Frame midflange on General Electric CF6‑80A engines and requires eventual repair or replacement to stop recurring checks. It targets operators of aircraft fitted with CF6‑80A powerplants (e.g., older Boeing 767, Airbus A300/310).\n\nIt adopts the FAA’s corresponding AD to prevent midflange fractures that have previously caused an aborted takeoff and could lead to serious engine failures."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"This directive adopts the technical requirements of FAA AD 95-17-16 but revises the compliance timing for paragraph (b) to 30 June 1997; otherwise it follows the FAA requirements and GE service information. The substantive scope (inspections, shop checks, and replacement/rework) remains aligned with the FAA AD (Requirement; Note; Compliance)."},"complexity_factors":["Cross-reference to FAA AD 95-17-16 and GE Service Bulletin (Requirement) increases dependency on external technical documents","Multiple acceptable inspection methods (on-wing eddy-current or on-wing FPI; shop-level FPI) requires operator choice and capability","Repetitive inspection intervals plus a terminating repair/replacement option create a mixed recurring and one-off compliance burden (Requirement; Note)","Specific applicability limited to CF6-80A engines narrows but concentrates impact on affected operators (Applicability)","Staggered compliance dates, including a revised date for paragraph (b), add scheduling complexity for fleet operators (Compliance)","Safety-critical nature (reported cracks and an incident) demands high technical accuracy and qualified maintenance resources (Background)"],"plain_english_summary":"This airworthiness directive applies to General Electric CF6-80A engines. It requires repetitive on-wing eddy-current or fluorescent-particle inspections and shop-level FPI of the compressor rear-frame (CRF) midflange, with mandatory replacement or rework of the midflange as terminating action. (Applicability; Requirement)\n\nOperators and maintenance organisations must meet the compliance timeline (effective 7 Dec 1995; one compliance date for paragraph (b) revised to 30 Jun 1997). The directive responds to discovered axial cracks and a flange-separation event that led to a rejected take-off. (Background; Compliance)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-35-compressor-rear-frame-midflange","history":"/api/acts/ad-cf6-35-compressor-rear-frame-midflange/history","analysis":"/api/acts/ad-cf6-35-compressor-rear-frame-midflange/analysis","conflicts":"/api/acts/ad-cf6-35-compressor-rear-frame-midflange/conflicts","importantCases":"/api/acts/ad-cf6-35-compressor-rear-frame-midflange/important-cases","documents":"/api/acts/ad-cf6-35-compressor-rear-frame-midflange/documents"}}