What should be engaged on an extension ladder before climbing?

Engaging the locks on an extension ladder before climbing is crucial for safety. The locks are designed to secure the ladder sections in place, preventing them from collapsing or sliding down while someone is on the ladder. This stability is essential to ensure that the ladder maintains its full height and provides a secure platform for anyone climbing it.

Ensuring the locks are properly engaged creates a more stable and reliable work environment and reduces the risk of accidents caused by ladder failure. While stabilizers, brakes, and safety straps may contribute to ladder safety in various contexts, the locks are the primary feature that directly controls the ladder's structural integrity during use, making them the most critical element to engage before climbing.