Wreckage from the downed REACT Helicopter heads to Kansas for further inspection.
The NTSB will perform forensic tests on the debris gathered from the crash scene in Lee County.
All three people on board died in the crash late Monday, Pilot Andy Olesen and flight nurses Jim Dillow and Karen Hollis.
The investigation is focusing on weather conditions, Olesen's flight history and medical records, dispatch communications, and the helicopter's maintenance records.
The NTSB also hopes to speak with more witnesses who heard or saw anything before the crash.
A preliminary report could be finished next week, but the NTSB doesn't expect to know the cause of the crash for about a year to 18 months.
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