(S (S (BASENP (NNP Flight) (NNP Safety) (NNP Pty) (NNP Ltd)) (VP (VBD had) (VP (VBN been) (VP (VP (VP (VBN asked) (S (VP (TO to) (VP (VP (VB carry) (PRT (RP out))) (BASENP (DT an) (JJ independent) (NN investigation)))))) (PP (IN by) (BASENP (DT an) (JJ anonymous) (NN client)))) (PP (IN after) (NP (BASENP (DT the) (NNP March) (NN 2007) (NN disaster)) (COMMA ,) (SBAR (SBAR (WHNP (WDT which)) (S (VP (VBD occurred)))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT the) (NN aircraft)) (VP (VP (VBD landed) (PP (IN at) (BASENP (JJ excessive) (NN speed)))) (CC and) (VP (VP (VBD shot) (PRT (RP off))) (NP (BASENP (DT the) (NN end)) (PP (IN of) (BASENP (DT the) (NN runway))))))))))))))) (PERIOD .))