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IC.4.7.1 Brakes and Throttle Position
a. The power to the electronic throttle must be shut down if the mechanical brakes are actuated and the TPS signals that the throttle is open by more than a permitted amount for more than one second.
b. An interval of one second is allowed for the throttle to close (return to idle). Failure to achieve this in the required interval must result in immediate shut down of fuel flow and the ignition system.
c. The permitted relationship between BSE and TPS may be defined by the team using a table, but the functionality must be demonstrated at Technical Inspection.
IC.4.7.2 Throttle Position vs Target
a. The power to the electronic throttle must be immediately shut down, if throttle position differs by more than 10% from the expected target TPS position for more than one second.
c. An error in TPS position and the resultant system shutdown must be demonstrated at Technical Inspection.
Teams must have a method to demonstrate that the actions in IC.4.7.2.b above are met. System states displayed using calibration software must be accompanied by a detailed explanation of the control system.
IC.4.7.3 The electronic throttle and fuel injector/ignition system shutdown must remain active until the TPS signals indicate the throttle is at or below the unpowered default position for one second or longer.