Which statement best defines Hidden Failure?

• A. Not visible until needed
• B. A physical condition indicating failure has started
• C. Inability to meet performance standard
• D. Warning signs but operating

Answer: (A)

Hidden failure means a fault that remains unseen during normal operation and only becomes evident when a function is actually required or stressed. That’s why the description “not visible until needed” is the best fit—the fault hides itself until the system demands it, at which point it can cause a problem. The other statements imply signs or indicators of failure that would be noticed sooner, or a direct performance shortfall, or warning signs while still operating, none of which capture the idea of something concealed until it’s needed.