Abstract: A fuel control having an electrically operated metering valve and a manually operated metering valve through which fuel is independently scheduled to an engine. During normal operation, the electrically operated metering valve controls the flow of fuel to the engine in response to an operator input signal. Linkage connected to a power lever supplies the manually operated metering valve with an input corresponding to the fuel flow requirement requested by the operator of the electrically operated metering valve. The manually operated metering valve is connected to the source of fuel through an electrically operated transfer valve. Should an electrical failure occur, the electrically operated transfer valve is deactivated and if the fuel flow requirement is below a fixed level, fuel flows from the source through the manually operated metering valve without moving the power lever to maintain a substantially constant engine speed.

Abstract: A flexural pivot for transferring an input force through a lever to develop an output force. The flexural pivot has a housing with a horizontal support and a vertical support. A first rectangular bar has a first end attached to the horizontal support and a second end attached to the lever. A second rectangular bar has a first end attached to the vertical support and a second end attached to the lever. The second ends of the first and second rectangular bars are attached to the lever to establish a fulcrum. The first bar holds the fulcrum in a substantially fixed horizontal position and the second bar holds the fulcrum in a substantially fixed vertical position whenever an input force is applied to the lever while allowing the lever to pivot about the fulcrum as a function of the twisting moment in the first and second bars.