Which of the following is NOT a safe practice for using aerial devices?

Extending the ladder while responders are on it is considered unsafe due to the potential for loss of balance, structural integrity, or sudden shifts that could occur during the extension process. Aerial ladders are designed to be deployed safely and effectively when they are positioned correctly and not under the weight of personnel. Doing so can lead to accidents, injury, or equipment failure as weight distribution changes, increasing the risk of tipping or collapsing.

Safe practices, such as being aware of overhead obstructions, adhering to the manufacturer's load recommendations, and retracting the ladder after positioning, contribute to ensuring the safety and effectiveness of aerial devices during operations. These practices help maintain stability and avoid hazardous situations that can compromise the safety of personnel working at heights.