Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to General Electric Aircraft Engines (GE) CF34 series turbofan engines. This proposal would require rework of the main fuel control (MFC) to add a flange vent groove and installation of a reworked MFC with improved overspeed protection. This proposal is prompted by reports of rapid uncommanded engine acceleration events. The actions specified by the proposed AD are intended to prevent uncommanded engine accelerations, which could result in an engine overspeed, uncontained engine failure, and damage to the aircraft.