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IC.4.8.1 A standalone nonprogrammable circuit must be used to monitor the electronic throttle control.
The BSPD must be provided in addition to the plausibility checks in the ETC which interpret the drivers throttle request and control the engine throttle position.
IC.4.8.2 Signals from any sensors must be sent directly to the BSPD. Outputs from other modules may not be used in place of the raw sensor signals.
IC.4.8.3 The BSPD must monitor for the following conditions:
a. Both of the following for more than one second:
Hard braking (for example >0.8 g deceleration but without locking the wheels)
Throttle greater than 10% open
b. Loss of signal from the braking sensor(s) for more than 100 msec
c. Loss of signal from the throttle sensor(s) for more than 100 msec
d. Removal of power from the BSPD circuit
IC.4.8.4 When any of the above conditions exist, the BSPD must:
Shut off power to the electronic throttle
Shut off fuel flow
Close the throttle to the idle position
IC.4.8.5 The BSPD must only be reset by cycling the Primary Master Switch IC.8.4.3 OFF and ON IC.4.8.6 The BSPD must not reset when the Cockpit Master Switch IC.8.4.4 is turned OFF
IC.4.8.7 The BSPD signals and function must be able to be checked during Technical Inspection by having one of:
a. A separate set of detachable connectors for any signals from the braking sensor(s), throttle sensor(s) and removal of power to only the BSPD device.
b. An inline switchable breakout box available that allows disconnection of the brake sensor(s), throttle sensor(s) individually and power to only the BSPD device.