Airworthiness Directive · Amendment 39-19236 · Turbine section
General Electric Company Turbofan Engines
This AD applies to General Electric (GE) CF6-80A, -80A1, -80A2, and -80A3 turbofan engines with low-pressure turbine (LPT) stage 3 nozzles, part numbers (P/Ns) 9290M52P05 and 9290M52P06, installed.
We are adopting a new airworthiness directive (AD) for all General Electric Company (GE) CF6-80A, -80A1, -80A2, and -80A3 turbofan engines. This AD was prompted by high cycle fatigue (HCF) cracking of the low-pressure turbine (LPT) stage 3 nozzles. This AD requires replacement of the LPT stage 3 nozzles, part numbers (P/Ns) 9290M52P05 and 9290M52P06, installed. We are issuing this AD to address the unsafe condition on these products.
Within 36 months or during the next engine shop visit after the effective date of this AD, whichever occurs later, replace LPT stage 3 nozzles, P/Ns 9290M52P05 and 9290M52P06, with a part eligible for installation.
(1) For the purpose of this AD, an engine shop visit is defined as the induction of an engine into the shop for maintenance involving the separation of any major mating engine flanges. The separation of engine flanges is not considered an engine shop visit for the following purposes:
(i) Transportation of an engine not attached to an aircraft without subsequent engine maintenance.
(ii) Removing the turbine rear frame (TRF) for repair of TRF cracking.
(iii) Removing the top or bottom high-pressure compressor (HPC) case for HPC airfoil maintenance.
(iv) Removing only the accessory gearbox and/or transfer gearbox.
(2) Reserved.
