The NTSB said a preliminary report, to be released within a month, will contain "factual information" gathered in the investigation.

The black box was discovered eight feet underground at the crash site after a two-day search and is in “decent shape,” according to reports.

After recovering both engines, the jet’s enhanced ground proximity warning system, the cockpit voice recorder and the black box, investigators are one step closer to understanding what went wrong aboard the medevac plane that crashed in Philadelphia on Friday,