Exports fell after the name became closely associated with terrorist attacks . Export of Semtex was progressively tightened and since 2002 all of Explosia 's sales have been controlled by a government ministry . , only approximately 10 tons of Semtex were produced annually , almost all for domestic use . On December 21 , 1988 , 12 ounces ( 340g ) of Semtex brought down a Boeing 747 over Lockerbie , Scotland killing all 259 aboard the aircraft and many on the ground
brought down a Boeing 747
Pan Am Flight 103
Semtex