(QT (DQL ``) (QTC (S (S (S (BASENP (DT The) (NN plane)) (VP (VBD was) (VP (VBG flying) (PP (IN at) (BASENP (DT a) (JJ great) (NN height)))))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN accident)) (VP (VBD occurred))))) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ means) (SBAR (S (BASENP (PRP it)) (VP (MD can) (VP (VB be) (VP (VP (VBN ruled) (PRT (RP out))) (SBAR (IN that) (S (BASENP (DT the) (NN craft)) (VP (VBD was) (VP (VBN shot) (PRT (RP down))))))))))))))) (PERIOD .)) (DQR ''))