What are two methods to secure a ground ladder?

The correct choice highlights two essential methods for securing a ground ladder that are crucial for ensuring safety during firefighting operations. Heeling a ladder involves putting weight on the base of the ladder, typically by placing a foot on it or having a firefighter stand on it. This action prevents the ladder from slipping out from under the firefighter when it is being used at an angle.

Tying in involves securing the ladder to a stable object or anchoring it in a manner that further stabilizes its position, preventing movement during operations. This is often accomplished using ropes or straps to bind the ladder securely to a fixed point, such as a truck or other sturdy structure. These methods together provide a robust system for maintaining ladder stability, particularly in dynamic environments where firefighters may be moving quickly or applying weight to the ladder while working.

The other options do not combine the most effective practices for securing a ground ladder. While heeling is essential and can appear in different combinations, the concepts of locking and bracing do not directly address the secure methods established in firefighting protocols or may refer to different techniques not focused solely on ladder safety. Therefore, the combination of heeling and tying in is recognized as the best practice for ensuring the integrity and safety of ladder operations in firefighting.