An almost forgotten war for most, but six helicopters downed over two days. This by SAAF Impala's (home built Aermachchi MB's) during the conflict in Angola.
From Wikipedia
https://en.wikipedia.org/wiki/Aermacchi_MB-326 "Impala Mk IIs were also opportunistically used as interceptors. In several encounters in 1985 with Mi-8 and Mi-24 helicopters they shot down a total of six. This happened during a crucial phase of the ground war, when Angolan and Cuban troops were checked in an offensive against UNITA bases. This ended in disaster for the Angolan/Cuban alliance when their supplies were cut off by UNITA and the SAAF and front line troops ran out of ammunition. Helicopters were being used to supply the besieged troops and the SAAF cut off this link. Two Mi-24s were shot down in the first encounter while escorting Mi-17s. The MiG-21s that escorted them flew too high to react in time. Two days later the Impala Mk IIs struck again, downing two Mi-24s and two Mi-17s."