How is overextension of the fly section of an extension ladder prevented?

Preventing the overextension of the fly section of an extension ladder is primarily achieved by using stops. Stops are mechanisms or physical barriers that limit the travel of the fly section when the ladder is extended. They ensure that the fly section does not extend beyond a safe limit, which is crucial for maintaining stability and preventing accidents during ladder operations.

When an extension ladder is used, extending it too far can introduce risks such as instability or the potential for the ladder to collapse under weight. By using stops, firefighters can ensure that the ladder is extended only to a safe degree, thereby safeguarding both the operators and the individuals they may be rescuing or aiding. This critical aspect of ladder safety practice maintains the structural integrity of the ladder while it is in use.