When using the alternate brake system, by what percentage should you increase mission computer generated landing or ground roll distance?

When using the alternate brake system on the C-17, it is crucial to understand that this system has limitations compared to the primary braking system. The alternate brake system is less effective, resulting in longer stopping distances. Therefore, the recommendation to increase the mission computer generated landing or ground roll distance by 25 percent ensures that pilots account for this reduced braking efficiency.

This adjustment is essential for maintaining safety during operations, particularly in situations where precise stopping distances are critical, such as during landing on shorter runways or in adverse weather conditions. By incorporating a 25 percent increase, pilots can better prepare for the specific characteristics and performance of the aircraft under alternate braking scenarios, thus reducing the risk of runway overruns or other safety incidents.