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37.3.1.3 Center Radar Automated Radar Terminal Systems (ARTS) Processing (CENRAP) was devel-oped to provide an alternative to a nonradar environment at terminal facilities should an ASR fail or malfunction. CENRAP sends aircraft radar beacon target information to the ASR terminal facility equipped with ARTS. Procedures used for the separation of aircraft may increase under certain conditions when a facility is utilizing CENRAP, because radar target information updates at a slower rate than the normal ASR radar. Radar services for VFR aircraft are also limited during CENRAP operations because of the additional workload required to provide services to IFR aircraft.
37.3.2 Surveillance radars scan through 360 degrees of azimuth and present target information on a radar display located in a tower or center. This information is used independently or in conjunction with other navigational aids in the control of air traffic.
37.4 Precision Approach Radar (PAR)
37.4.1 PAR is designed for use as a landing aid rather than an aid for sequencing and spacing aircraft. PAR equipment may be used as a primary landing aid (See ENR 1.5 for additional information), or it may be used to monitor other types of approaches. It is designed to display range, azimuth, and elevation information.
37.4.2 Two antennas are used in the PAR array, one scanning a vertical plane, and the other scanning horizontally. Since the range is limited to 10 miles, azimuth to 20 degrees, and elevation to 7 degrees, only the final approach area is covered. Each scope is divided into two parts. The upper half presents altitude and distance information, and the lower half presents azimuth and distance.

Federal Aviation Administration Twentieth Edition
FIG ENR 1.1.24
ARTS III Radar Scope With Alphanumeric Data

NOTE.

A number of radar terminals do not have ARTS equipment. Those facilities and certain ARTCCs outside the contiguous U.S. would have radar displays similar to the lower right hand subset. ARTS facilities and NAS Stage A ARTCCs, when operating in the nonautomation mode, would also have similar displays and certain services based on automation may not be available.
EXAMPLE.
1.
Areas of precipitation (can be reduced by CP)

2.
Arrival/departure tabular list

3.
Trackball (control) position symbol (A)

4.
Airway (lines are sometimes deleted in part)

5.
Radar limit line for control

6.
Obstruction (video map)

7.
Primary radar returns of obstacles or terrain (can be removed by MTI)

8.
Satellite airports

9.
Runway centerlines (marks and spaces indicate miles)

10.
Primary airport with parallel runways

11.
Approach gates

12.
Tracked target (primary and beacon target)

13.
Control position symbol

14.
Untracked target select code (monitored) with Mode C readout of 5,000’

15.
Untracked target without Mode C

16.
Primary target

17.
Beacon target only (secondary radar) (transponder)

18.
Primary and beacon target

19.
Leader line

20.
Altitude Mode C readout is 6,000’ (Note: readouts may not be displayed because of nonreceipt of beacon information, garbled beacon signals, and flight plan data which is displayed alternately with the altitude readout)

21.
Ground speed readout is 240 knots (Note: readouts may not be displayed because of a loss of beacon signal, a controller alert that a pilot was squawking emergency, radio failure, etc.)

22.
Aircraft ID

23.
 Asterisk indicates a controller entry in Mode C block. In this case 5,000’ is entered and “05” would alternate with Mode C readout.

24.
Indicates heavy

25.
“Low ALT” flashes to indicate when an aircraft’s predicted descent places the aircraft in an unsafe proximity to terrain. (Note: this feature does not function if the aircraft is not squawking Mode C. When a helicopter or aircraft is known to be operating below the lower safe limit, the “low ALT” can be changed to “inhibit” and flashing ceases.)

26.
NAVAIDs

27.
Airways

28.
Primary target only

29.
Nonmonitored. No Mode C (an asterisk would indicate nonmonitored with Mode C)

30.
Beacon target only (secondary radar based on aircraft transponder)

31.
Tracked target (primary and beacon target) control position A

32.
Aircraft is squawking emergency code 7700 and is nonmonitored, untracked, Mode C

33.
Controller assigned runway 36 right alternates with Mode C readout (Note: a three letter identifier could also indicate the arrival is at specific airport)

34.
Ident flashes

35.
Identing target blossoms
　
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