It is the acronym of Alternate Current.

Is the spanish acronym of Acumulador de Carga Rápida. Rapid charge accumulator.

Automatic Dropping Device 

Air Generation and Treatment Unit

Acceptable Index of Precursors

Include the expenses for support staff (structure) and expenses not directly payable between projects are recorded. 

European National Security Authorities

Auxiliary Power Supply 

Automatic Run Registration

It is the acronym in Spanish of Anuncio de Señales y Freno Automático. Signal announcement and automatic brake.