Under Out of Service Evaluation Required, which item indicates wear requiring evaluation?

• A. Rollers or slides that are worn
• B. Aerial lighting systems
• C. Visual and audible alarm systems
• D. Intercom system failures

Answer: (A)

When an appliance is placed Out of Service Evaluation Required, physical wear on moving, load-bearing parts is a primary wear indicator. Rollers or slides that are worn directly affect how the telescoping sections move: they can cause binding, misalignment, or increased play, which undermines safe extension, retraction, and stability. This kind of wear is exactly what triggers a formal evaluation to determine if the device can be safely returned to service or needs parts replaced. Other items listed—lighting systems, alarm systems, and intercoms—are important faults or system failures, but they reflect electrical or functional issues rather than wear on mechanical components that execute the movement and support the boom. So worn rollers or slides are the clear wear indicator requiring evaluation.