The back-up brake system is capable of holding the aircraft on a _______° slope under a no-_______ condition at a maximum alternate gross weight.

The back-up brake system is specifically designed to ensure that the aircraft can remain stationary on a slope under certain conditions, which is critical for safety and operational procedures. In this case, the correct answer indicates that the back-up brake system can effectively hold the aircraft on a 10° slope when there is a no-power condition and at a maximum alternate gross weight.

This capability is essential for managing situations where primary braking systems may have failed or when power is not available, ensuring that the aircraft does not roll away unintentionally. The 10° slope specification under these conditions reflects the system's reliability and performance parameters, which are crucial for pilots and ground crews to understand for safe aircraft operation and to mitigate risks during ground handling.

Understanding the specific angles at which the back-up brake system operates effectively allows pilots to make informed decisions regarding the positioning and securing of the aircraft in various environments, particularly on inclines. This knowledge is fundamental to operational safety, especially in scenarios where the aircraft might be parked on a slope.