Final answer:
The claim that an IFR flight plan is required to operate in IMC in class G airspace when weather conditions are less than VMC is false. Class G is uncontrolled airspace, and pilots can fly in IMC without an IFR flight plan if they have the necessary rating and equipment.
Step-by-step explanation:
The statement that an IFR flight plan is required to operate in IMC in class G airspace when weather conditions are less than VMC is false. An IFR flight plan is not specifically required for flight in class G airspace, even when the weather conditions are IMC. Class G airspace is uncontrolled and pilots can fly in IMC without an IFR flight plan, assuming they are appropriately rated and their aircraft is equipped for IFR flight. However, it is still the pilot's responsibility to ensure they can operate safely according to the regulations, which might include filing an IFR flight plan if they can't maintain VMC. In the US, IFR operations in Class G airspace and IMC conditions often necessitate an IFR flight plan once above 1,200 feet AGL during the day, or above 500 feet AGL at night.