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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.
37.3.2Surveillance 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.
37.4Precision Approach Radar (PAR)
37.4.1PAR 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.
37.4.2Two 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.
AIP ENR 1.1−35
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
FIG ENR 1.1−22
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 StageA ARTCCs, when operating
in the nonautomation mode, would also have similar displays and certain services based on automation may not be
available.
ENR 1.1−36 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
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
ModeC 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
36.Untracked target identing on a selected code
37.Range marks (10 and 15 miles) (can be changed/
offset)
38.Aircraft controlled by center
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