▁fus el age , ▁stabil is ers ▁and ▁rud ders ), ▁A erm ac chi ▁produced ▁ 2 2 . 8 ▁per ▁cent ▁( front ▁fus el age ▁and ▁tail ▁cone ), ▁and ▁Em bra er ▁performed ▁ 2 9 . 7 ▁per ▁cent ▁of ▁the ▁work ▁( wing , ▁air ▁int akes , ▁p yl ons ▁and ▁drop ▁t anks ). ▁There ▁was ▁no ▁dup lication ▁of ▁work , ▁each ▁component ▁of ▁the ▁aircraft ▁was ▁built ▁at ▁one ▁source ▁only . ▁The ▁planned ▁requirements ▁were ▁ 1 8 7 ▁aircraft ▁for ▁Italy ▁and ▁ 1 0 0 ▁for ▁Brazil . ▁ ▁In ▁the ▁early ▁stages ▁of ▁development , ▁various ▁different ▁power pl ants ▁and ▁engine ▁configurations ▁were ▁studied ▁to ▁power ▁the ▁type ; ▁both ▁tw in - engine ▁and ▁single - engine ▁approaches ▁were ▁considered . ▁The ▁use ▁of ▁US - s our ced ▁engines ▁had ▁been ▁prompt ly ▁disc ount ed ▁to ▁avoid ▁any ▁potential ▁restrictions ▁on ▁export ▁sales ▁of ▁the ▁overall ▁aircraft . ▁Among st ▁the ▁engines ▁exam ined ▁were ▁the ▁Tur bo - Union ▁R B 1 9 9 ▁( as ▁used ▁by ▁the ▁larger ▁Pan avia ▁T orn ado ), ▁the ▁Roll s - Ro y ce ▁Tur b ome ca ▁Ad our , ▁Roll s - Ro y ce ▁Vi per , ▁and ▁the ▁Roll s - Ro y ce ▁Spe y ▁engine . ▁In ▁ 1 9 7 8 , ▁the ▁Spe y ▁ 8 0 7 ▁model , ▁which ▁featured ▁several ▁additional ▁improvements , ▁was