APPENDIX A3$_{ }$ Data Inputs  Conventional and Alternative Fuel  Description  Source  http://www.epa.gov/otaq/models/nonrdmdl/nonrdmdl2005/420r05013.pdf.  EDMS/AEDT has the capabilities to compute GSE emissions. GSE emissions inventories using  EDMS/AEDT are set to capture GSE utilization at an airport for two activities: (i) GSE servicing  aircraft (e.g., a baggage tractor visiting an aircraft at the apron to drop off baggage), and (ii) GSE  population not tied to gate service operations (e.g., a deicing truck driving back and forth to a  deicing area during the deicing season).  Within EDMS/AEDT, GSE usage is dependent upon the size of aircraft being serviced (e.g.,  small, narrow body, and wide body) as well as the operational purpose of the aircraft passenger air carrier, cargo air carrier, etc.). In EDMS/AEDT, GSE emissions generated by LTO  cycle are the product of the emission factor, horsepower, load factor and  operating time. For  annual emissions this result is multiplied by the number of yearly LTO cycles for the aircraft to  which the equipment is assigned. Alternatively, for a population GSE, the annual GSE emissions  are the product of the emission factor for the given pollutant, horsepower, load factor, annual  usage and population.  EDMS/AEDT offers default values for many of the parameters mentioned (e.g., horsepower,  load factor, etc.). EDMS/AEDT also allows the user to override default data to the extent more  site-specific GSE fleet information is available. Therefore, it is ideal to gather site -specific GSE  data from the airport, the airlines, the equipment/vehicl e owner/operator, or by performing in - the-field surveys.  A3.3  Computing GSE Emissions with EDMS/AEDT  17$_{ }$