Timothy McCormack did not have the proper license to fly in low-visibility conditions, the FAA told NBC and The Hill. The New York City area on Monday was obscured by clouds and rain throughout the day, including at the time of the crash.
Article source: https://www.huffpost.com/entry/new-york-helicopter-crash-federal-aviation-administration_n_5d000fb6e4b0e7e7816ed3a7