The only condition in which helicopters have to file flight plans is when there is no visibility since pilots cannot use visual cues like the horizon, ground features, and other landmarks.
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Flight Plans MUST be submitted by a pilot registered with SMU and the drone must have been registered with SMU and the FAA prior to submission. This flight plan will be approved during business hours within 1 week. Flight plans should be submitted at least 7 days before a flight is scheduled.
Use of instrument flight rules is also required when flying in Class A airspace regardless of weather conditions. Class A airspace extends from 18,000 feet above mean sea level to flight level 600 (60,000 feet pressure altitude) above the contiguous 48 United States and overlying the waters within 12 miles thereof.
When you don't open a VFR flight plan with FSS or Air Traffic Control (ATC) it's as if you never took off even if you filed the VFR flight plan. I did this once on a long cross country. It didn't' occur to me until I landed that I filed my flight plan, but I hadn't opened it. It was useless!
(a) No person may take off an aircraft unless the pilot in command has filed a flight plan, containing the appropriate information required by part 91, with the nearest FAA communication station or appropriate military station or, when operating outside the United States, with other appropriate authority.
The answer, based on a TPG analysis of a decade of safety data: Like almost every other mode of transportation, flying in a helicopter is considerably more dangerous than airline travel. But it's far safer than riding in a car.
In theory, a pilot can operate in sub-VMC conditions under IFR without an ATC clearance in Class G airspace. However, to enter or operate in controlled airspace under IFR, an ATC clearance is required.