full authority digital engine control (FADEC)

Full Authority Submarine Control (FASC)

full motion full mission flight simulator

engine capacity / engine power, engine output

airspace control authority

operational control authority

digital fire control system (DFCS)

digital audio control system

full-speed trial of engine

full engine acceleration

full-span control surface

full solution director-type fire control system

reaction engine / motor (jet engine)

rotary engine (Wankel engine)

engine ground run / engine test

engine oil reservoir / engine oil tank

authority

coastal authority

coordinating authority

defense shipping authority

delegation of authority

digital ballistic computer

digital battlefield centerpiece

digital communications

digital data bus

Digital Selective Calling (DSC)

direct liaison authority (DIRLAUTH)

engagement authority (EA)

Local Emergency Management Authority (LEMA)

Milestone Decision Authority (MDA)

NATO military authority (NMA)

port authority

redistribution authority