How long after centrifuge runs must personnel wait before flying?

• A. 6 Hours
• B. 2 Hours
• C. 4 Hours
• D. 8 Hours

Answer: (A)

The key idea is that after intense G-force exposure in a centrifuge, the body and brain need time to recover before returning to flight duties. High-G training can leave residual effects like dizziness, vertigo, headache, fatigue, or slowed reaction time as the vestibular system and autonomic responses reset. Giving the body a quiet recovery window helps ensure a pilot’s cognitive and motor performance is back to baseline and reduces the risk of errors in the cockpit.

Six hours is chosen as a conservative, practical rest period that typically allows these acute effects to subside while still fitting into training schedules. Shorter intervals (like two or four hours) may not fully resolve symptoms, increasing risk, while a longer interval (such as eight hours) can unnecessarily delay training without additional safety benefit for most trainees.

During this window, the focus is on rest and monitoring for any lingering symptoms, ensuring readiness to fly only when symptom-free and medically cleared.