TM 5-4220-231-14&P 1-5    List  of  Abbreviations/Acronyms. The   following  is  a   listing  of  abbreviations/acronyms used    in this   manual. A After MAC Maintenance Allocation Chart Attn Attention MOPP Mission Oriented Protective Posture B Before NAVCOASTSYSCEN Naval Coastal Systems Center CCW counterclockwise PMCS Preventive Maintenance Checks & cfm cubic feet per minute Services CGA Compressed Gas Association pneumo pneumo-fathometer CRS Chamber Reducing Station psi pounds per    square inch CW clockwise psig pounds per square inch    gage D During RC Recompression Chamber DA Department of  the Army RMV Respiratory Minute Volume DACC Diver    Air   Control Console scf standard cubic feet DASS Diver    Air   Storage System scfm standard cubic feet per minute EIR Equipment Improvement SDASS Special Diver   Air   Support System Recommendation SF Standard Form FM Field    Manual SOP Standard Operating Procedures fsw feet   of  seawater TAMMS The Army Maintenance Management HP High   Pressure System IAW In Accordance With TM Technical Manual LO Lubrication Order TROSCOM Troop Support Command LP Low   Pressure VTA Volume Tank    Assembly Ipm liters    per   minute W Weekly 1-6 Purpose of   SDASS. The Special Diver Air   Support System (SDASS) furnishes breathing air   for   up   to   three working divers at    a maximum depth of    250 fsw with constant depth monitoring. The system also supports recompression chamber operations. The SDASS can be employed in   division, corps, and    theater Army areas to support divers during construction, salvage, recovery, repair, and emergency diving missions. Section II. EQUIPMENT DESCRIPTION Page 1-7 Equipment Characteristics, Capabilities, and Features ............................. 1-4 1-8 Location and    Description of  Major    Components .................................. 1-6 1-9 Equipment Data ......................................................... 1-7 1-7 Equipment Characteristics, Capabilities and    Features. a. System Description. The    SDASS supports a  one    day,    extended lightweight diving    operation, or   the    secondary life support air  source requirements for   recompression chambers, as   prescribed in Army   diving   doctrine FM  20-11   -1. The    SDASS provides breathing air  to   diver    personnel by   accepting air  from   any   of  three separate air  sources and properly distributing the air   to   one, two,   or   three divers at   a   maximum of   250    fsw. The system provides constant depth monitoring of  the divers by   topside support personnel. 1-4