Doug Brazy, an investigator from the National Transportation Safety Board (NTSB), said there was an indication the pilot might have attempted to make radio calls towards the end of the flight, in a news conference in New York.
The pilot picked up a passenger from Westchester, north of New York City, and brought him to Manhattan before heading towards New Jersey, Brazy said. He crashed on the roof just minutes later.
The aircraft has no flight data recorder or voice recorder, but investigators are looking for a memory mechanism that might have recorded audio, Brazy said.
The NTSB plans to do a toxicology report on the pilot.
The pilot was the only person on board at the time of the crash, and the passenger he dropped off earlier indicated there was "nothing out of the ordinary" during his flight, Brazy said.
The wreckage, which a salvage company will bring down from the roof for further inspection, is "highly fragmented" and the post-crash fire consumed much of it, Brazy said. The roof does not have a helipad.
The NTSB is in charge of determining what caused the accident. A preliminary report will be published in around 2 weeks, Brazy said, but a full report giving conclusions on the cause of the crash is not expected for at least 15 months.
The pilot picked up a passenger from Westchester, north of New York City, and brought him to Manhattan before heading towards New Jersey, Brazy said. He crashed on the roof just minutes later.
The aircraft has no flight data recorder or voice recorder, but investigators are looking for a memory mechanism that might have recorded audio, Brazy said.
The NTSB plans to do a toxicology report on the pilot.
The pilot was the only person on board at the time of the crash, and the passenger he dropped off earlier indicated there was "nothing out of the ordinary" during his flight, Brazy said.
The wreckage, which a salvage company will bring down from the roof for further inspection, is "highly fragmented" and the post-crash fire consumed much of it, Brazy said. The roof does not have a helipad.
The NTSB is in charge of determining what caused the accident. A preliminary report will be published in around 2 weeks, Brazy said, but a full report giving conclusions on the cause of the crash is not expected for at least 15 months.