If the MILDS declares a potential threat, the pre-alarm information is provided to the MCDU. The MACS sensoris then directed by the MCDU to confirm the presence of an approaching missile. The selected MACS sensor antenna is aligned to the direction of the detected potential threat and its distance and approaching velocity are measured.
If the measured parameters fit to the characteristics of an approaching missile, the threat will be confirmed by the MACS and the confirmation including parameters like distance and velocity is provided to the MCDU. The MCDU, depending on the operating mode of AMPS-MV, automatically initiates the countermeasures.