Which type of failure is defined as the inability to meet the specified performance standard?

Which type of failure is defined as the inability to meet the specified performance standard?

• A. Functional Failure
• B. Potential Failure
• C. Hidden Failure
• D. Intermittent Failure

Answer: (A)

Functional failure happens when a device cannot perform its intended function to the required performance standard. The performance standard sets what the instrument must do—things like accuracy, range, response time, and reliability. If the output or behavior falls outside those criteria, the function isn’t fulfilled, which is exactly what a functional failure describes. For example, a transmitter that should read signals within a tight tolerance but consistently drifts beyond that tolerance isn’t meeting the performance standard, so it’s a functional failure. The other terms describe different situations: a potential failure is a risk of failing under certain conditions, a hidden failure is a fault that isn’t detected by normal monitoring, and an intermittent failure appears only sporadically.

Functional failure happens when a device cannot perform its intended function to the required performance standard. The performance standard sets what the instrument must do—things like accuracy, range, response time, and reliability. If the output or behavior falls outside those criteria, the function isn’t fulfilled, which is exactly what a functional failure describes. For example, a transmitter that should read signals within a tight tolerance but consistently drifts beyond that tolerance isn’t meeting the performance standard, so it’s a functional failure. The other terms describe different situations: a potential failure is a risk of failing under certain conditions, a hidden failure is a fault that isn’t detected by normal monitoring, and an intermittent failure appears only sporadically.