Final answer:
The 'Config Brake' warning alerts pilots when the parking brakes are on and the engines' N1 value exceeds a programmed limit. The exact value varies by aircraft, so pilots must refer to the aircraft's operating manual. This warning aims to prevent taxi or takeoff with the parking brakes engaged.
Step-by-step explanation:
The question pertains to an aircraft's warning system that alerts the pilot when an incorrect configuration is detected. Specifically, the "Config Brake" warning is associated with the aircraft's parking brakes being engaged. On most commercial aircraft, this warning is triggered when the engines' thrust (measured by N1, which is the low-pressure compressor speed) exceeds a certain limit while the parking brake is set.
Without specific details on the aircraft model, it's challenging to provide an exact N1 value at which the "Config Brake" warning will sound, as different aircraft have different programmed values for this warning. It is essential for pilots to refer to their specific aircraft's operating manual for exact procedures and warning parameters.
Nevertheless, the general idea is that the "Config Brake" warning serves to prevent pilots from attempting to taxi or even take off with the parking brakes engaged, which could lead to overheated brakes or other dangerous situations. Therefore, this auditory alert plays a vital role in ensuring aircraft safety during ground operations.