3. The Radar Set AN/FPN-40 has four
height finder, final approach, and taxi.
Functions of Radar Set AN/FPN-40
a. The surveillance function is used to detect small aircraft within a
radius of 25 miles and large aircraft within a radius of 40 miles.
b. The height finder function is used to determine the height of an
aircraft if the aircraft is within 30 miles of the airfield and between 500
and 50,000 feet in altitude.
c. The final approach function is used to guide the aircraft along the
proper glide path and course line to the touchdown point.