TM 10-6640-238-13 1-6 1-8. NOMENCLATURE CROSS-REFERENCE LIST. Common Name or Abbreviation Official Nomenclature %V Percent of Volume A Lab Petroleum Laboratory, Model-A AC Alternating Current amp Ampere ASTM American Society for Testing and Materials BII Basic Issue Items COE Components of End Item COTS Commercial off the Shelf DC Direct Current ECU Environmental Control Unit FSII Fuel System Icing Inhibitor FTMS Federal Test Methods Standards Gas Alarm Gas Detection and Alarm System GFI Ground Fault Interrupt gph or GPH Gallons per Hour gpm or GPM Gallons per Minute Hg Mercury hp Horsepower Hz Hertz JFTOT Jet Fuel Thermal Oxidation Tester LCD Liquid Crystal Display lel Lower Explosive Limit MAC Maintenance Allocation Chart Modular Base Petroleum Laboratory (MBPL) Petroleum Laboratory, Semi-Trailer Mounted MTOE Modified Table of Organization and Equipment MWO Modification Work Order pH Degree of Acidity or Alkalinity psi Pounds per Square Inch PMCS Preventive Maintenance Checks and Services RPM Revolution per Minute RPSTL Repair Parts and Special Tools List RVP Reid Vapor Pressure Steam Generator Low Pressure Boiler Steam Super Heater High Pressure Boiler V Volts W Watt