What is the term for the mechanical locking devices used to secure the extended fly section(s) of an extension ladder?

The term for the mechanical locking devices used to secure the extended fly section(s) of an extension ladder is "pawls." Pawls are essential components because they engage with teeth or notches on the ladder, allowing the fly sections to be locked in place securely. This prevents accidental collapse or movement while the ladder is in use, ensuring the safety of firefighters who rely on these ladders for access or escape.

The importance of pawls cannot be overstated, as they provide the necessary mechanical advantage and safety feature for extension ladders, which are commonly used in firefighting operations and building rescues. Proper understanding and recognition of pawls are crucial for firefighters when conducting inspections, training, and actual firefighting efforts, as they play a vital role in ladder stability and usability.