Summary
The FAA proposes to adopt a new airworthiness directive (AD) for General Electric Company (GE) CF34-8C1/-8C5/-8C5B1/-8E5/-8E5A1, and CF34-10E series turbofan engines with certain part number (P/N) and serial number (SN) fuel metering units (FMU) installed. This proposed AD would require a onetime test of the FMU for a miswired (reversed polarity) condition of the input wires to the overspeed solenoid. This proposed AD results from the discovery of miswired FMU overspeed solenoids in the field. We are proposing this AD to prevent the engine from failing to shutdown as commanded during an overspeed, leading to uncontained engine failure.