utt le ▁configuration ▁usually ▁provided ▁a ▁week ▁to ▁ten ▁days ▁of ▁space fl ight . ▁Several ▁research ▁projects ▁and ▁hardware ▁components ▁were ▁part ▁of ▁the ▁project , ▁of ▁which ▁the ▁E DO - pal let ▁was ▁one ▁of ▁the ▁most ▁visible , ▁contract ed ▁by ▁Rock well ▁International . ▁ ▁The ▁first ▁orb iter ▁out f itted ▁with ▁the ▁E DO ▁hardware ▁configuration ▁was ▁Ende av our , ▁during ▁its ▁construction , ▁and ▁its ▁last ▁E DO ▁flight ▁was ▁ST S - 6 7 , ▁in ▁ 1 9 9 5 . ▁Ende av our ' s ▁E DO ▁modifications ▁were ▁removed ▁in ▁ 1 9 9 6 ▁as ▁part ▁of ▁routine ▁maintenance , ▁to ▁reduce ▁the ▁orb iter ' s ▁weight ▁prior ▁to ▁ST S - 8 9 . ▁Columbia ▁was ▁out f itted ▁for ▁E DO ▁flight ▁during ▁its ▁maintenance ▁period ▁from ▁August ▁ 1 0 , ▁ 1 9 9 1 , ▁through ▁February ▁ 9 , ▁ 1 9 9 2 , ▁prior ▁to ▁ST S - 5 0 , ▁which ▁was ▁the ▁first ▁E DO ▁flight . ▁From ▁ 1 9 9 2 , ▁through ▁ 1 9 9 4 , ▁Atl ant is ▁went ▁through ▁a ▁maintenance ▁period , ▁during ▁which ▁Atl ant is ▁was ▁modified ▁to ▁have ▁the ▁prov isions ▁needed ▁for ▁E DO ▁cap ability , ▁but ▁NASA ▁chose ▁not ▁to ▁proceed ▁with ▁the ▁final ▁modifications , ▁and ▁Atl ant is ▁does ▁not ▁have ▁E DO ▁cap ability . ▁The ▁E DO - pal let