An acoustic signal to warn of an air attack and to announce an alarm. May we never really hear it. The film and the material contained therein are purely educational - a film created for the Education for Safety lesson.
Aviation alarm, announcing an alarm - a siren that sounds an alarm
Aviation alarm, announcing an alarm - a siren that sounds an alarm
#alarm #aircraft alarm #siren alarm #siren #edb #security education # signal
5 июл 2022
