Before climbing a ladder, fire fighters should make sure it is __________.

Before climbing a ladder, it is critical for firefighters to ensure that it is heeled. Heeling a ladder involves securing its base to prevent it from slipping or sliding out while someone is ascending or descending. This technique provides the necessary stability and prevents accidents, as the potential for the ladder to move can lead to serious injuries. Ensuring the ladder is heeled is especially important in emergency situations where quick access and stability are vital.

While security, raising, and overall stability of the ladder are important considerations, heeling specifically addresses the risk of the ladder slipping at the base. It directly correlates to the immediate safety of the firefighter when they are on the ladder, making it a fundamental practice in ladder safety.