Airworthiness Directive · Amendment 39-22205 · Turbine section
General Electric Company Turbofan Engines
This AD applies to General Electric Company CF34-8C1, CF34-8C5, CF34-8C5A1, CF34-8C5A2, CF34-8C5A3, CF34-8C5B1, CF34-8E2, CF34-8E2A1, CF34-8E5, CF34-8E5A1, CF34-8E5A2, CF34-8E6, and CF34-8E6A1 model turbofan engines with an installed low-pressure turbine (LPT) stage 5 disk, part number (P/N) 4117T14P02.
The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) CF34-8C and CF34-8E model turbofan engines. This AD was prompted by a report of a crack found on the low-pressure turbine (LPT) stage 5 disk at the forward arm area. This AD requires the removal of the affected LPT stage 5 disk and replacement with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
During the next piece-part exposure after the affected LPT stage 5 disk accumulates 8,000 cycles since new (CSN), remove the affected LPT stage 5 disk and replace with a part eligible for installation.
Do not install an affected LPT stage 5 disk with 8,000 CSN or more into the LPT module of the engine.
(1) For the purpose of this AD, a “part eligible for installation” is an LPT stage 5 disk, P/N 4117T14P03, or later approved P/N.
(2) For the purpose of this AD, “piece-part exposure” is when the LPT module is separated from the engine and the LPT stage 5 blades are removed from the LPT stage 5 disk.
