7-22 Change AU.S. Navy Diving Manual—Volume 27-5.1.2Harness Straps and Backpack.Check for signs of rot and excessive wear. Adjust straps for individual use and test quick-release mechanisms. Check backpack for cracks and other unsafe conditions.7-5.1.3Breathing Hoses.Check the hoses for cracks and punctures. Test the connections of each hose at the regulator and mouthpiece assembly bytugging on the hose. Check the clamps for corrosion and damage; replace as necessary and inaccordance with PMS procedures.7-5.1.4Regulator.1.Ensure over-bottom pressure of first stage regulator has been set to a minimumof 135 psig or in accordance with manufacturer's recommendations within thepast year.2.Attach regulator to the cylinder manifold, ensuring that the O-ring is properlyseated. 3.Crack the cylinder valve open and wait until the hoses and gauges haveequalized. 4.Next open the cylinder valve completely and then close (back off) one-quarterturn. 5.Check for any leaks in the regulator by listening for the sound of escaping air.If a leak is suspected, determine the exact location by submerging the valveassembly and the regulator in a tank of water and watch for escaping bubbles.Frequently the problem can be traced to an improperly seated regulator and iscorrected by closing the valve, bleeding the regulator, detaching and reseating.If the leak is at the O-ring and reseating does not solve the problem, replacethe O-ring and check again for leaks.7-5.1.5Life Preserver/Buoyancy Compensator (BC)Orally inflate preserver to check for leaks and then squeeze out all air. Theremaining gas should be removed after entry into the water by rolling onto theback and depressing the oral inflation tube just above the surface. Never suckthe air out, as it may contain excessive carbon dioxide. Inspect the carbon dioxide cartridges to ensure they have not been used (sealsintact) and are the proper size for the vest being used and for the depth of dive. The cartridges shall be weighed in accordance with the Planned MaintenanceSystem.
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