TM 55-6930-212-10 D DB Decibels DC Direct current DCPT Differential collective pitch DEMO Demonstration DEV Deviation DHN Dothan DIG Digital image generator DN Down DOF Degrees of freedom DOP Doppler DPS Degrees per second DVS Digital voice system E E East ECL Engine condition lever ELEC Electrical ELEV Elevation EMER Emergency ENG Engine ENTR Enter ENV Environment EW Electronic warfare EXP Expenditures F F Fahrenheit FLD Field FLT Flight FM Frequency modulated FOV Field of view FPM Feet per minute FREQ Frequency FS Flight simulator FT Feet FWD Forward G GCA Ground-controlled approach GPD Ground plot display GPM Press on AAF GRND Ground GRWT,  GW Gross weight G/S Glideslope H HD High-density (sling load operations) HDG Heading HEY Hanchey AHP Glossary 2