Updated with auxiliary port and front stand offs.
Updated layout, diagrams and removed references to specific torque specs.
Updated diagram on page 7, 10 and 12 with correct call-outs for the washer, O-ring and O-ring EGS valve and the defogger or “steady or free-flow” valve.
Updated the cross references to the torque specs due to the splitting of APNDX into three separate modules.
Updated layout.
Updated icons throughout. Changed, "Defogger Valve" to "Steady Flow Valve" throughout and swapped defogger and steady flow in section 1.3.1 Disassembly of the Defogger Valve on page SSB-5.
Added silicone application diagram to page SSB-3.
Updated step four in section 1.1 Separating the Side Block Assembly from the Helmet Shell and step one in section 1.2 Side Block Assembly Replacement to remove reference to acetone. Changed mask to helmet in step eight of section 1.2 Side Block Assembly Replacement.
Updated caption in last image of section 1.3.1 Disassembly of the Steady Flow Valve.
Updated steps two and three in section 1.3.2 Cleaning and Lubricating by replacing "Teflon®" with "Nylon."
Updated diagram and caption on page SSB-7.
Removed "Teflon® Tape" from the list of required tools, updated the second and last images, and changed Loctite® 222 to Loctite® 248 in the last image in section 1.4.1 Disassembly of the Emergency Valve (EGS Valve).
Replaced "Teflon®" with "Nylon" in steps two and three of section 1.4.2 Cleaning and Lubricating and in step one of section 1.4.3 Reassembly of Emergency Valve (EGS Valve).
Changed "Non-return Valve" to "One Way Valve" and updated the image at the bottom of page SSB-13.
Updated step four in section 1.4.2 Cleaning and Lubricating.
