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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”.
Both the UHMS and DAN agree that “There can never be a flying after diving rule that
is guaranteed to prevent decompression sickness completely. Rather, there can be a
guideline that represents the best estimate for a conservative . . . surface interval for
the vast majority of divers. There will always be an occasional diver whose physi-
ological makeup or special diving circumstances will result in the bends”.
To reduce the risk of developing decompression sickness after a single no decompres-
sion dive, current guidelines suggest waiting 12 hours prior to exposure to
atmospheric pressures equivalent to 1,000 feet (330 meters) above sea level, or
greater. When repetitive dives are conducted during the same day, or period of days,
it is suggested that the interval be increased to a minimum of 24 hours. Note that land
travel to higher elevations after diving must also be considered as an exposure to
altitude.
** excerpted from “DAN’s Position on Recreational Flying After Diving”