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Donning Procedures - CONT.
Table 2-4.  Equipment Checks Prior to Water Entry - TM-5-4220-226-14P_27

TM-5-4220-226-14P MK12 Surface Supported Diving System (SSDS) (NSN 4220-01-097-5674) Manual
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TM 5-4220-226-14&P Table 2-3.  Donning Procedures - CONT Step Procedure 5.  Don helmet - continued. f.  Pull neck dam forward and then pull up over the front of the helmet until helmet o-ring Is covered by the neck dam and neck ring. g.  Once the neck dam is in place, swing the neck clamp lever to the left until it snaps closed and locks neck ring onto the helmet. h.  Feel the lever and latch catch mechanism to ensure it is correctly engaged and locked. 6.  Breathing system check. a.  Open and close the steady flow valve to ensure proper operation. b.  Open and close dial-a-breath knob to ensure proper operation. c.  Check breathing resistance by breathing in and out.  Adjust dial-a- breath so that only slight effort is required to inhale. d.  Press demand regulator purge button to check air purge. 7.  Don weight belt. Place the SCUBA-type weight belt around the diver's waist. 8.  Attach umbilical to harness. Attach the umbilical to the D-ring at the left side of the diver's waist and tuck pneumfathometer into harness. 2-8.  Equipment Checks Prior to Water Entry. The checks in table 2-4 will be accomplished after donning the equipment, but prior to water entry. 2-11









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