What is the waiting period after centrifuge runs before flight?

• A. 6 Hours
• B. 3 Hours
• C. 12 Hours
• D. 24 Hours

Answer: (A)

The main idea is giving the body time to recover from the physiological stress of high-G exposure before flying again. When a centrifuge simulates high G, blood is redirected toward the lower body, which can drop blood flow to the brain and impair vision, balance, and mental performance. After such exposure, the nervous system, cardiovascular system, and vestibular system need time to return to their baseline states, rehydrate if needed, and for any transient symptoms like dizziness, headache, or fatigue to resolve.

Six hours provides a practical rest window for these systems to re-equilibrate, reducing the risk of residual orthostatic intolerance or G-induced symptoms during subsequent flight. If symptoms persist, flight should be postponed and evaluated. Shorter intervals might not allow full recovery, while longer delays can unnecessarily impact readiness.