Emergency park brake system

An emergency park brake system of an aircraft, the emergency park brake system comprising:

• a user input interface configured to receive actuation input from a user;
• a first displacement sensor coupled to the user input interface, the first displacement sensor configured to detect displacement of the user input interface and generate a first status of the user input interface;
• a second displacement sensor coupled to the user input interface, the second displacement sensor configured to detect displacement of the user input interface and generate a second status of the user input interface;
• an emergency park brake controller having a processor;
• and
• a tangible, non-transitory memory configured to communicate with the processor, the tangible, non-transitory memory having instructions stored thereon that, in response to execution by the processor, cause the emergency park brake system to perform operations comprising:
• receiving, by the processor, the first status of the user input interface and the second status of the user input interface;
• comparing, by the processor, the first status of the user input interface with the second status of the user input interface to yield comparison data;
• determining, by the processor, a first emergency park brake condition based on whether the comparison data yields a threshold difference between the first status of the user input interface and the second status of the user input interface;
• in response to determining that the comparison data is less than the threshold difference and thus that the first emergency park brake condition indicates an operative condition, transmitting, by the processor, a braking command to a braking assembly to apply a braking force at a wheel;
• in response to determining that the comparison data is greater than the threshold difference and thus that the first emergency park brake condition indicates a failure condition, not transmitting, by the processor, the braking command to the braking assembly to prevent the braking force from being applied at the wheel;
• determining, by the processor and based on the first emergency park brake condition, a second emergency park brake condition.

A method of controlling an emergency park brake system of an aircraft, the method comprising:

• receiving, by an emergency park brake controller, a first status of a user input interface from a first displacement sensor and a second status of the user input interface from a second displacement sensor;
• comparing, by the emergency park brake controller, the first status of the user input interface with the second status of the user input interface to yield comparison data;
• and
• determining, by the emergency park brake controller and based on the comparison data, an emergency park brake condition, wherein determining the emergency park brake condition comprises determining whether the comparison data comprises a threshold difference between the first status of the user input interface and the second status of the user input interface;
• in response to determining that the comparison data is less than the threshold difference and thus that the emergency park brake condition indicates an operative condition, transmitting, by the emergency park brake controller, a braking command to a braking assembly;
• and
• in response to determining that the comparison data is greater than the threshold difference and thus that the emergency park brake condition indicates a failure condition, not transmitting, by the emergency park brake controller, the braking command to the braking assembly;
• wherein the emergency park brake condition is a first emergency park brake condition, wherein the method further comprises determining, by the emergency park brake controller and based on the first emergency park brake condition, a second emergency park brake condition, wherein determining the second emergency park brake condition is only performed in response to the first emergency park brake condition indicating an operative condition.