What is the required waiting time after a decompression dive before flying?

The recommended waiting time after a decompression dive before flying is indeed 24 hours. This guideline is set to allow sufficient time for the body to eliminate any nitrogen that may have been absorbed during the dive, thus reducing the risk of decompression sickness (DCS) when ascending to higher altitudes during flight.

During a dive, especially those involving multiple levels or longer exposure times, nitrogen is absorbed into the body tissues under increased pressure. When a diver ascends rapidly or fails to allow adequate time for the nitrogen to be released gradually, it can lead to bubble formation in the bloodstream and tissues, which is harmful. Waiting 24 hours provides an additional safety buffer and ensures that the diver’s body has adequate time to normalize after exposure to pressure changes.

Other suggested waiting times are generally considered to either be too long or unnecessary for most recreational diving scenarios. Overall, the guideline aims to balance safety and practicality for those who dive and then wish to fly. Following a 24-hour surface interval is a widely accepted standard to help ensure the safety of pilots and passengers alike.