Airworthiness directives › 2005-18-16
AD 2005-18-16 Airworthiness Directives; General Electric Company CF34-3A1 Turbofan Engines
Applicability*9
This AD applies to General Electric CF34-3A1 turbofan engines installed on Bombardier series Regional Jet Model CL-600-2B19 (Regional Jet Series 100 and 440) airplanes with one or more of the HPT rotating components installed, listed in the following Table 1: Table 1.—HPT Rotating Components With Life Limits Restored Part No. Nomenclature 6078T90P01 Seal, Balance Piston Air. 6017T00P05 Shaft, HPT Rotor. 4027T15P03 Plate, Stage 1 Front Cooling. 6078T93P01 Disk, Stage 1 Turbine. 6078T93P02 Disk, Stage 1 Turbine. 5041T70P03 Plate, Stage 1 Aft Cooling. 5023T97P03 Plate, Stage 2 Rear Cooling. 6078T94P01 Disk, Stage 2 Turbine. 6078T94P02 Disk, Stage 2 Turbine. 5042T29P02 Plate, Stage 2 Front Cooling. 5041T67P02 Coupling, Outer Torque. 5079T02P01 Coupling, Inner Torque.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. (f) Remove from service the HPT rotating components listed in Table 1 of this AD before exceeding the life limit of 6,000 cycles-since-new. Alternative Methods of
Unsafe condition
This AD results from the discovery that the manufacturer removed the HPT rotating component part numbers, listed in Table 1 of this AD, from the HPT Life Limits section of the CF34 Engine Manual, SEI-756. We view this as a change to the life limit of the part, removing the type design life limit and imposing an unlimited life on the part. We are issuing this AD to re-impose life limits on the HPT rotating components with part numbers listed in Table 1 of this AD to prevent LCF cracking and failure of those components, which could result in uncontained engine failure and damage to the airplane.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1