Which of the following is a hazard associated with hook up operations?

Cargo extensions and/or projections are indeed significant hazards associated with hookup operations. When loads have extensions or projections, they create an increased risk of snagging or colliding with the environment, including structures, trees, or other obstacles during the lift and transport. This exposure can lead to accidents or damage to both the load and the aircraft. Proper load preparation is essential, ensuring that all cargo is securely contained and that any projections are managed to minimize risks during the operation.

While other factors like weather changes, communication failures, and low visibility can also present hazards in different contexts, the specific mention of cargo extensions and projections directly pertains to the physical characteristics of the load being handled, making it a primary concern in hookup operations. Understanding and addressing this hazard is crucial for the safety and efficiency of sling load operations.