Latent conditions are factors in systems that contribute to errors when combined with active failures.

• A. Active failures
• B. Systemic failures
• C. Latent conditions
• D. Preconditions

Answer: (C)

Latent conditions are hidden weaknesses in a system that set the stage for errors. They come from design flaws, organizational shortcomings, or environmental factors—things that sit in the background and don’t cause harm by themselves but shape how likely a mistake is to occur. When an operator commits an active failure (the immediate human error), these latent conditions can align with it and turn that error into an incident or accident. This is the essence of the idea often illustrated by the Swiss cheese model: holes (weaknesses) in defenses line up with an active error to allow harm. Examples in UAS operation include unclear procedures, inadequate training, poor interface design, maintenance gaps, or scheduling pressures that fatigue crews. The statement correctly identifies latent conditions as the systemic factors contributing to errors when paired with active failures.