The reasons are technical, arising from the way the software processed radar information, as well as from poor primary radar coverage where American 77 was flying.
( ( The reasons ) ( ( ( ( are technical ) , ) ( arising ( ( ( ( from ( ( the way ) ( ( the software ) ( processed ( radar information ) ) ) ) ) , ) ( as ( well as ) ) ) ( from ( ( poor ( primary ( radar coverage ) ) ) ( where ( ( American 77 ) ( was flying ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS reasons)) (VP (VBP are) (ADJP (JJ technical)) (, ,) (S (VP (VBG arising) (PP (PP (IN from) (NP (NP (DT the) (NN way)) (SBAR (S (NP (DT the) (NN software)) (VP (VBD processed) (NP (NN radar) (NN information))))))) (, ,) (CONJP (RB as) (RB well) (IN as)) (PP (IN from) (NP (NP (JJ poor) (JJ primary) (NN radar) (NN coverage)) (SBAR (WHADVP (WRB where)) (S (NP (NNP American) (CD 77)) (VP (VBD was) (VP (VBG flying))))))))))) (. .)))
Everything on the plane was working up to standard and did not contribute to the difficulty in locating it.
( ( Everything ( on ( the plane ) ) ) ( ( ( ( was ( ( working up ) ( to standard ) ) ) and ) ( ( did not ) ( ( contribute ( to ( the difficulty ) ) ) ( in ( locating it ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN Everything)) (PP (IN on) (NP (DT the) (NN plane)))) (VP (VP (VBD was) (VP (VBG working) (PRT (RP up)) (PP (TO to) (NP (NN standard))))) (CC and) (VP (VBD did) (RB not) (VP (VB contribute) (PP (TO to) (NP (DT the) (NN difficulty))) (PP (IN in) (S (VP (VBG locating) (NP (PRP it)))))))) (. .)))