TM 5-4220-226-14&P2-6. Predive Setup Procedures - continued.Table 2-2. Predive Setup Procedures - CONTStepProcedure2. Connect and check emergencye. Check that no air is escaping through the one-way valve byair supply - continuedholding a moistened finger lightly to the main air supply inlet.WARNINGIt is required that the emergency air supply beworn on all dives to depths in excess of 60 feet. Itis recommended that it be worn on shallow dives(less than 60 feet deep) as well.f. Close the cylinder valve and the emergency air supply valve onthe side block. Wipe any residual moisture from the one-wayvalve.3. Connect and check main airWARNINGsupply.Never connect the main air supply hose (umbilical)to the emergency air supply inlet. The emergencyair supply valve does not incorporate a one-wayvalve to protect the diver from baratrauma(squeeze) in the event of loss of pressure in theumbilical.a. Using the helmet adapter hose, connect the umbilical to the mainair inlet on the side block assembly.NOTEUse two wrenches to connect the umbilical - oneto hold the adapter and one to turn the hose fittingto prevent damage to the adapter threads.Umbilical connection should be snug but notovertight. Do not use excessive force or theadapter will be damaged.b. Turn on the main air supply from the surface support platform.c. Slowly open the steady flow valve on the side block and checkfor flow of air into the helmet.d. Close the steady flow valve.e. Momentarily depress the demand regulator purge button.f. Turn dial-a-breath knob out until regulator freeflows, then turnknob back in until it stops.g. Extend the nose block device outside the mask.2-6
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