The 218 Mk 4 advanced composition flare is used in aircraft countermeasures systems to combat IR heat-seeking missiles. The Impulse Cartridge is fitted during manufacture of the flare and provides the means of ejecting the payload. The flare can be housed in a multiple shot magazine as fitted to countermeasures dispensing sets AN/ALE 40, 45 and 47 series, M130/M147, MBDA, Terma, Rokar, MES, SAAB Avitronics and Thales systems for example.
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