Final answer:
Half-scale deflection of the CDI on a VOR represents typically a 5 or 10-degree angular deviation from the intended course, with the exact value depending on the equipment's sensitivity mode.
Step-by-step explanation:
The angular deviation from a VOR course represented by half-scale deflection of the CDI (Course Deviation Indicator) is typically 5 degrees or 10 degrees, depending on the sensitivity mode selected on the navigation equipment. This deviation indicates how far the aircraft is from its intended flight path. Half-scale deflection occurs when the CDI needle is halfway between the center and the edge of the instrument display.
The VOR system is designed so that full-scale deflection occurs at a set angular deviation from the course, which represents a significant navigational error and prompts corrective action from the pilot. On the other hand, small deviations are represented by more minor needle movements, allowing the pilot to make more precise adjustments to maintain the desired course.
In the context of aviation navigation systems, the VOR (VHF Omnidirectional Range) system uses a course deviation indicator (CDI) to provide information about the angular deviation from the desired course.
For a VOR system, half-scale deflection of the CDI represents an angular deviation of 10 degrees from the desired course. This means that if the CDI needle deflects to the halfway mark, it indicates the aircraft is 10 degrees off course.
The CDI is designed to provide accurate positional information for pilots, helping them maintain their desired course and avoid drifting off track.