 Complete the following phrase:  In the midst of that conflict, on April 21, 1983, three LARAF Ilyushin Il-76TDs and one Lockheed C-130 Hercules landed at Manaus Airport, Brazil after one of the Il-76s developed technical problems while crossing the Atlantic Ocean. The aircraft were then searched by the Brazilian authorities: instead of medical supplies  as quoted in the transport documentation  the crate of the first of 17 L-39s bound for Nicaragua together with arms and parachutes, to 