It's very favorable for accident cause investigation of wreckage airplane if Cockpit Voice Recorder (CVR) 'sound information is effectively identified.

But without clear-cut data from the plane "s cockpit-voice or flight-data recorders, it may be hard for investigators to conclusively back up pilot assertions or precisely determine what happened."

But without clear-cut data from the plane's cockpit-voice or flight-data recorders, it may be hard because investigators to conclusively behind up pilot assertions or precisely decide what happened.