Abstract: A method of operation is provided. The operating method includes: operating an aircraft powerplant with a powerplant performance characteristic at a first setting, the operating of the aircraft powerplant including combusting a first fuel in the aircraft powerplant; receiving a command to operate the aircraft powerplant with the powerplant performance characteristic at a second setting; modeling operation of the aircraft powerplant using a first fuel digital twin of the aircraft powerplant, the operation of the aircraft powerplant modeled to determine a first fuel value of a first operational parameter for the aircraft powerplant when operating the aircraft powerplant with the powerplant performance characteristic at the second setting and combusting the first fuel in the aircraft powerplant; and selecting the first fuel or a second fuel for operating the aircraft powerplant with the powerplant performance characteristic at the second setting based on the first fuel value of the first operational parameter.

Abstract: A method of operation is provided. The operating method includes: operating an aircraft powerplant with a powerplant performance characteristic at a first setting, the operating of the aircraft powerplant including combusting a first fuel in the aircraft powerplant; receiving a command to operate the aircraft powerplant with the powerplant performance characteristic at a second setting; modeling operation of the aircraft powerplant using a first fuel digital twin of the aircraft powerplant, the operation of the aircraft powerplant modeled to determine a first fuel value of a first operational parameter for the aircraft powerplant when operating the aircraft powerplant with the powerplant performance characteristic at the second setting and combusting the first fuel in the aircraft powerplant; and selecting the first fuel or a second fuel for operating the aircraft powerplant with the powerplant performance characteristic at the second setting based on the first fuel value of the first operational parameter.

Abstract: A method is provided which includes: processing first fuel data to determine a first trend of a powerplant performance characteristic for a first fuel, wherein the first fuel data is indicative of a plurality of first values of a tracked operational parameter for an aircraft powerplant model over a period of time, and the first values were recorded when combusting the first fuel; processing second fuel data to determine a second trend of the powerplant performance characteristic for a second fuel, wherein the second fuel data is indicative of a plurality of second values of the tracked operational parameter for the aircraft powerplant model over the period of time, and the second values were recorded when combusting the second fuel; and scheduling use of the first fuel and the second fuel based on the first trend of the powerplant performance characteristic and the second trend of the powerplant performance characteristic.

Abstract: A logic circuit includes a timer and a plurality of switch assemblies in signal communication with the timer. Each switch assembly of the plurality of switch assemblies includes a switch including a true input gate, a false input gate, and an output gate, a first delay in signal communication with the output gate, and a second delay in signal communication between the output gate and the false input gate.

Abstract: A logic circuit includes a timer and a plurality of switch assemblies in signal communication with the timer. Each switch assembly of the plurality of switch assemblies includes a switch including a true input gate, a false input gate, and an output gate, a first delay in signal communication with the output gate, and a second delay in signal communication between the output gate and the false input gate.