▁into ▁Super t ank ers . ▁The ▁first ▁converted ▁Bo eing ▁ 7 4 7 ▁( N 4 7 0 EV ) ▁made ▁its ▁ma iden ▁flight ▁on ▁February ▁ 1 9 , ▁ 2 0 0 4 . ▁▁ ▁By ▁June ▁ 2 0 0 6 , ▁Ever green ▁had ▁spent ▁$ 4 0 ▁million ▁on ▁the ▁project ▁and ▁was ▁waiting ▁for ▁both ▁US ▁Federal ▁A viation ▁Administration ▁( FA A ) ▁cert ification ▁and ▁an ▁evaluation ▁contract ▁from ▁the ▁US ▁Forest ▁Service . ▁ ▁In ▁October ▁ 2 0 0 6 ▁the ▁F AA ▁issued ▁Ever green ▁a ▁supp lement ary ▁type ▁certificate ▁for ▁the ▁" install ation ▁and ▁removal " ▁of ▁internal ▁t anks , ▁associated ▁systems ▁and ▁the ▁support ▁structure ▁for ▁the ▁aer ial ▁dispers al ▁of ▁liqu ids . ▁ ▁Design ▁ ▁The ▁Global ▁Super t ank er ▁is ▁equ ipped ▁with ▁a ▁press ur ized ▁liquid ▁drop ▁system , ▁which ▁can ▁dis per se ▁fire ▁ret ard ant ▁under ▁high ▁pressure ▁or ▁drop ▁ret ard ant ▁at ▁the ▁speed ▁of ▁falling ▁rain . ▁Using ▁the ▁press ur ized ▁system , ▁the ▁aircraft ▁can ▁deliver ▁ret ard ant ▁to ▁the ▁scene ▁of ▁a ▁fire ▁while ▁flying ▁at ▁a ▁height ▁of ▁, ▁at ▁approximately ▁, ▁configured ▁as ▁if ▁it ▁were ▁on ▁approach ▁for ▁landing . ▁The ▁Super t ank er ' s ▁tank ▁system ▁can ▁be ▁configured ▁for ▁segment ed ▁dro ps , ▁allowing ▁the ▁contents ▁of ▁the ▁tank ▁to ▁be ▁released ▁at ▁multiple ▁intervals ▁while ▁in ▁flight .