What is a consequence of using the parking brake handle for emergency braking?

Using the parking brake handle for emergency braking can lead to an increased runway length requirement. When the parking brake is engaged during an emergency, the braking force is applied in a manner that does not allow for the anti-skid system to function effectively. This can result in wheel lock-up, which reduces the overall braking efficiency and increases the risk of skidding. Consequently, in these situations, the aircraft may require more distance to come to a complete stop.

When braking is less effective and potentially leads to skidding or uncontrolled deceleration, the aircraft may not stop as efficiently as it would under normal braking conditions. This scenario emphasizes the critical need for pilots to employ the main braking systems, which are designed to work optimally, whereas the parking brake should primarily be used in a static situation or during regular parking when the aircraft is not in motion.