Operation Manual

* excerpted from “The UHMS Flying After Diving Workshop”

** excerpted from “DAN’s Current Position on Recreational Flying After Diving”

MORE ABOUT FLYING AFTER DIVING

In 1990 the Undersea and Hyperbaric Medical Society (UHMS) published a set

of guidelines aimed at minimizing the possibility of decompression sickness due

to flying too soon after diving. The UHMS suggests* divers using standard air

cylinders and exhibiting no symptoms of decompression sickness wait 24 hours

after their last dive to fly in aircraft with cabin pressures up to 8,000 feet.

(2,440 meters).

The two exceptions to this recommendation are:

• If a diver had less than 2 hours total accumulated dive time in the last 48

hours, then a 12 hour surface interval before flying is recommended.

• Following any dive that required a decompression stop, flying should be

delayed for at least 24 hours, and if possible, for 48 hours.

Since the 1990 UHMS guidelines were introduced, data from the Diver’s Alert

Network (DAN) was introduced that resulted in DAN’s position** that “A

minimum surface interval of only 12 hours would be required in order to be

reasonably assured a diver will remain symptom free upon ascent to altitude in

a commercial jet airliner (altitude up to 8,000 feet/2,440 meters). Divers who

plan to make daily, multiple dives for several days, or make dives that require

decompression stops, should take special precautions and wait for an extended

surface interval beyond 12 hours before flight”.