Volume 2, Number 9, Page 2


October 1999


New U.S. Navy Unlimited/No-Decompression Limits and Repetitive Group Designation Tables for Unlimited/No-Decompression Air Dives, Standard Air Decompression Tables and Required Surface Interval Before Ascent to Altitude After Diving Table (table 9-5) have been released. All units should begin using these 1999 tables immediately. When using Table 9-5, use the highest repetitive group designator obtained in the previous 24-hour period. Table 9-5 may only be used when the maximum altitude achieved is 10,000 feet or less. The cabin pressure in commercial aircraft is maintained at a constant value regardless of the actual altitude of the flight. Though cabin pressure varies somewhat with aircraft type, the nominal value is 8000 feet. For commercial flights, use a final altitude of 8000 feet to compute the required surface interval before diving. No surface interval is required before taking a commercial flight if the dive site is at 8000 feet or higher. In this case, flying results in an increase in atmospheric pressure rather than a decrease.

EXAMPLE: a diver surfaces from a 60 fsw for 60 minute no-decompression dive at sea level with Repetitive Group J. After a Surface Interval of 6 hours and 10 minutes, the diver makes a second dive to 30 fsw for 20 minutes placing him/her in Repetitive Group C. The diver then plans to fly in a commercial aircraft with cabin pressure controlled at 8,000 feet. What is the required Surface Interval before flying? Because the diver has made two dives in the previous 24-hour period, he/she must use the highest Repetitive Group Designator of the two dives. Enter Table 9-5 at 8,000 feet and read down to Repetitive Group J. The diver must wait 17 hours and 35 minutes after completion of the second dive before flying.End of Article


The NOAA Diving Center has been delegated the task of issuing yearly Dive Orders for NOAA Corps officers assigned to AMC and PMC. NOAA Corps Officers must have current dive orders to be receive dive pay. NOS, NMFS and OAR units with NOAA Corps officers must renew orders for those Officers assigned and on active diving status.End of Article


Dick CarlsonIt is with deep regret that we note the death of Dr. Harry Richard "Dick" Carlson, long time NOAA scientist and diver. Dick had been employed as a fisheries biologist at the Auke Bay Laboratory since 1968. He was involved with various herring and rockfish studies, and more recently with ABL’s Ocean Carrying Capacity Program. Dick was one of NOAA’s most active Divers, having logged close to 3000 dives since 1973. Many of his studies used diving observations as a research tool and resulted in peer reviewed publications. His most recent paper appeared in the March 1999 issue of Marine Biology and detailed the 17 years of observing the Rose Star Crossaster papposus. Dick had a deep love of the sea, its inhabitants, and diving. He unselfishly shared his knowledge with his fellow scientists, dive buddies and the public. Dick was struck by a drunk driver shortly after work on the afternoon of July 21. He is survived by his wife Shirley and son Lloyd. He will be greatly missed by all who had the privilege of knowing him.End of Article


With the end of FY1999, annual operational reports are now due from NOAA diving units. Please complete these reports by October 31, forwarding the information to your respective LODO with a copy to NDC. The annual report form is also found on the UDS website in the FORMS section. Information provided is used in the NDP Annual Report.End of Article


Effective immediately, Luxfer now requires that their scuba cylinders 15 years old and older be visually inspected annually, as well as, inspected with Visual Plus or equivalent non-destructive testing equipment. A NOAA Safety Bulletin will be issued on this subject in the near future.End of Article

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