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AD/CF34/10 - Stage 5 and 6 Low Pressure Turbine Disks
General Electric Turbine Engines - CF34 General Electric Turbine Engines - CF34 Series
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General Electric Turbine Engines - CF34 Series
| AD/CF34/10 | Stage 5 and 6 Low Pressure Turbine Disks | 5/2006 |
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| Applicability: | General Electric Company (GE) CF34-3A1 and -3B1 series turbofan engines with stage 5 low pressure turbine (LPT) disks, part number (P/N) 6078T92P01 or stage 6 LPT disks P/N 6078T89P01, or both, with serial numbers (SNs) listed in Figure 3 or Figure 4 of GE Alert Service Bulletin (ASB) No. CF34-AL S/B 72-A0173,Revision 05, dated 24 May 2005; andGE CF34-1A, -3A, -3A1, -3A2, and -3B series turbofan engines with stage 5 LPT disks P/N 4922T16P01, 5024T53P01, 5024T53P02, or 6078T92P01 or stage 6 LPT disks P/Ns 4922T17P01, 5023T45P03, 5023T45P04, or 6078T89P01, or both, with SNs listed in Figure 3 or Figure 4 of GE ASB No. CF34-BJ S/B 72-A0148,Revision 02, dated 24 May 2005.Note 1: These engines are installed on Bombardier Canadair Models CL-600-2B19 Regional Jet (RJ) aeroplanes, and CL-600-2A12 (CL-601), CL-600-2B16(CL-601-3A), (CL-601-3R), and (CL- 604) Business Jet (BJ) aeroplanes. |
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| Requirement: | Carry out initial and repetitive inspections and replacement of the Stage 5 and Stage 6 LPT disks as detailed in paragraphs (f) through (s) of FAA AD 2006-04-12.Note 2: FAA AD 2006-04-12 provides actions with regard to optional terminating action and definitions with regard to piece part, replacement engine or replacement LPT module.Note 3: FAA AD 2006-04-12 Amdt 39-14494 refers. |
| Compliance: | As detailed in FAA AD 2006-04-12 with a revised effective date of 11 May 2006. |
| This Airworthiness Directive becomes effective on 11 May 2006. |
| Background: | This AD results from the discovery of a population of suspect stage 5 LPT disks and stage 6 LPT disks that could fail due to low-cycle fatigue cracking that may start at the site of an electrical arc-out on the disk. We are issuing this AD to prevent low-cycle-fatigue (LCF) failure of stage 5 LPT disks and stage 6 LPT disks, which could lead to uncontained engine failure. |
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James Coyne
Delegate of the Civil Aviation Safety Authority
29 March 2006