Airworthiness Directive · Amendment 39-16922 · General Electric Company Turbofan Engines
General Electric Company Turbofan Engines
This AD applies to General Electric Company (GE) CF34-10E series turbofan engines, serial number (S/N) 994116, and S/Ns 994118 through 994187, inclusive.
We are adopting a new airworthiness directive (AD) for General Electric Company (GE) CF34-10E series turbofan engines. This AD was prompted by a report of heavy wear found on the seating surface of the center vent duct (CVD) (commonly referred to as center vent tube) support ring and on the inside diameter of the fan drive shaft at the mating location. This AD requires removing from service all CVD support assemblies and any fan drive shaft on the affected engines if wear is found on either the CVD support ring or the fan drive shaft. We are issuing this AD to prevent fan drive shaft failure, leading to uncontained engine failure and damage to the airplane.
Comply with this AD before accumulating 11,500 total cycles-in-service on the engine, unless already done.
Visually inspect the seating surface of the CVD support ring for wear.
(1) If there is sign of wear on the CVD support ring, remove the CVD support assembly and the fan drive shaft from service before further flight.
(2) If there is no sign of wear on the CVD support ring, remove the CVD support assembly from service and borescope inspect the inside diameter of the fan drive shaft at the CVD support ring contact area for wear.
(3) If there is sign of wear on the inside diameter of the fan drive shaft, remove the fan drive shaft from service before further flight.
After the effective date of this AD, do not return to service any CVD support assembly (consisting of self-locking nut, P/N 2226M57G03, threaded sleeve, P/N 2226M55P03, and support ring, P/N 2226M56P01) or fan drive shaft removed from service as specified in this AD.
For the purposes of this AD, the phrase “sign of wear” is defined as any visual indication of removal of parent material from the CVD seating surface or the fan drive shaft.
