Nondestructive testing (NDT) on aerial devices should be performed at least how often?

• A. Every year
• B. Every 5 years
• C. Every 2 years
• D. Every 10 years

Answer: (B)

Periodic nondestructive testing is used to catch hidden flaws in the critical load-bearing parts of aerial devices before they fail. These components endure repetitive, high-stress cycles as the boom extends, raises, and operates, so fatigue cracks or corrosion can develop without obvious outside signs. Regular NDT helps detect cracks, corrosion, or other defects early, ensuring structural integrity and safe operation.

The recommended minimum interval for most fire service aerials is every five years. This timing reflects a balance between catching fatigue-related flaws and the practical demands of maintenance scheduling and cost. If the device has a significant impact, heavy damage, or repair that could affect structural integrity, or if the manufacturer or local regulations require it, NDT should be performed sooner, but routine checks do not need to be yearly or every two years for most equipment. Ten-year intervals would risk missing developing defects, while annual testing generally isn’t required unless specified by authority or manufacturer.