(S (S (NP (NP (BASENP (DT The) (NN launch)) (PP (IN of) (BASENP (NNP Discovery)))) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (VP (VBN supposed) (S (VP (TO to) (VP (VB occur) (PP (IN at) (BASENP (NN 4:50) (NN p.m.)))))))))) (COMMA ,))) (VP (VBD was) (VP (VP (VBN delayed) (PP (IN for) (BASENP (NN three) (NNS minutes)))) (PP (JJ due) (PP (TO to) (NP (NP (BASENP (DT a) (JJ technical) (NN problem)) (PP (IN in) (NP (BASENP (DT the) (NN shuttle) (POS 's)) (BASENP (NN command) (NN system))))) (CC and) (NP (NP (BASENP (DT a) (JJ chipped) (NN heat) (NN shield) (NN tile)) (PP (IN near) (BASENP (DT the) (NN crew) (NN hatch)))) (SBAR (WHNP (WDT which)) (S (VP (VBD needed) (S (VP (TO to) (VP (VB be) (VP (VBN patched))))))))))))))) (PERIOD .))