GLOSSARY TM 1-1520-238–T–10 GLOSSARY ABBR +B 1ST 2ND A A AC ACC ACCEL ACCLRM ACK ACKN ACM ACQ ACT ACTG ACTR AD ADDR ADF ADJ ADP ADRS ADS ADS ADSS ADV ALC ALT DEFINITION positive battery voltage first second ampere (electrical unit of measure) unit assembly/black box aft avionics bay alternating current accumulator acceleration accelerometer acknowledge acknowledge auto contrast command acquisition actuator actuating actuator acknowledge discrete address automatic direction finder adjust air data processor address air data sensor air data system air data subsystem advance azimuth limit control altimeter amplitude modulation ABBR AMMO AMP AMP AMPL AN AND ANN ANT APN APPR APPRCH APU AR ARC ARCS ARINC ARM ASE ASSY ATE ATS ATTD AUD AUTO AUTO/MAN AUX AV AWS DEFINITION ammunition ampere (electrical unit of measure) amplifier amplifier army navy alphanumeric display annunciator antenna airborne pulse navigation approach approach auxiliary power unit impedance matching amplifier airborne radio control aerial rocket control system airborne radio inc armament armed automatic stabilization equipment. assembly automatic test equipment air turbine starter attitude audio automatic automatic/manual auxiliary air vehicle area weapon system Glossary–1