A PPI is a scope with the scanning aircraft's/radar's position in the center, and a full 360 degree top down view of the area.

• A. Center, and a full 360 degree top down view of the area
• B. A sector in front of the aircraft
• C. Behind the aircraft
• D. A vertical profile of targets

Answer: (A)

A PPI provides a plan view from above, with the scanning radar or aircraft positioned at the center. Targets are plotted by their azimuth around the circle and their range from the center, so as the radar sweeps 360 degrees you get a complete top-down view of the area surrounding the aircraft. This is why the description describes both the central position and the full 360-degree view.

A sector in front would limit the display to a portion of azimuth rather than the entire circle. A view behind the aircraft isn’t how a PPI is oriented for situational awareness, and a vertical profile of targets corresponds to a different display (an RHI), which shows height versus range rather than a plan view.