After exposure to rapid decompression at high altitudes, how long must flight personnel refrain from flight duties?

• A. 6 hours
• B. 12 hours
• C. 24 hours
• D. 48 hours

Answer: (B)

The recommendation for flight personnel to refrain from flight duties after exposure to rapid decompression at high altitudes is 12 hours. This is based on the need to allow sufficient time for the body to eliminate inert gas bubbles that may have formed during the rapid decrease in pressure. When rapid decompression occurs, nitrogen that is dissolved in the body may come out of solution and form bubbles, similar to decompression sickness in divers.

By implementing a 12-hour waiting period, this allows the individual to be monitored for any potential signs of decompression sickness and ensures that they have returned to a stable physiological state before returning to flight duties. This precaution helps to maintain safety and operational readiness in flight operations, making 12 hours the appropriate duration for personnel to refrain from flying.