What is the definition of "full scale deflection" in terms of VOR?

Full scale deflection for a VOR (VHF Omnidirectional Range) indicates the maximum angular deviation that the VOR indicator will show when the aircraft is more than 10 degrees off the selected course. According to FAA regulations, full scale deflection occurs at an angular displacement of 10 degrees, which means that the needle on the VOR indicator will move to its extreme left or right positions when the aircraft deviates by this amount or more from the desired course. This is critical information for pilots navigating using VOR, as understanding the limits of the equipment aids in accurate course tracking and navigation.