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on each MFD.
In a single-WXP installation, radar range is controlled with the DCP located on the
same side of the cockpit as the WXP, providing transfer mode is not selected (XFR
button on the DCP).
Display Control Panel (DCP)
Figure 17-11
Weather Radar Displays
Pushing the WX button on the DCP adds the weather radar overlay to the following
MFD formats:
• NAV SECTOR
• FMS MAP
• TCAS
Figure 17-14 shows an example of the weather radar overlay on the supported MFD
formats.
Weather radar system and/or lightning detection system failure messages are displayed
on the weather radar mode line, or in the lower left and right corners of the MFDs.
NAV
SOURCE
FORMAT RANGE
BRG TERR WX TFC
PUSH
X- SIDE
P604_17_057
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-19
P I LOT T R A I N I N G GU I D E
MFD Formats - Display of Weather Radar
Figure 17-12
WX G+3 USTB T+10.7
UTC11:42 TAS 250 SAT 12 C TAT 15 C
+02
-02
-10
TCAS OFF
ABOVE
BELOW
TCAS MODE


10NM
GS 254
CID
30
33 340 N
3
100
ADF 1 ADF 2
200
WX+GCS T+10.7A
UTC11:42 TAS 250 GS 254 SAT 12 C TAT 15 C
VOR1
CID
TTG :07
CRS 350
30.0NM
VOR2
DBQ
CRS 030
167NM
TTG :38
NAV SECTOR MODE
IA
IOW
ATY
MXO
ANOSA
DBQ
OTM
NEBOR
TNU
ALO
30
33 340 N
3
50
100
LX/WX+TRB+GCS G+3
G+3
USTB
USTB
T+10.7
UTC 11:42 TAS 250 GS 254 SAT 12 C TAT -15 C
ADF 1 ADF 2
DBQ
CID
ATY
KORD
NM
45NM
83NM
480NM
042 0:10
0:20
1:57
11:52
11:32
12:02
13:39 8440LB 35.3GW
Data
Window
FMS MAP MODE
P604_17_010
Weather Radar
Mode Line
NAVIGATION SYSTEMS
17-20 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
Display Levels
The colors used on the radar display to represent rainfall intensity are as follows:
Path Attenuation Correction (PAC) Alert Mode
When a precipitation cell is of sufficient dimension to use the full range of attenuation
correction, a condition known as Path Attenuation Correction (PAC) alert occurs. Its
function is to allow a true image of a precipitation cell to be rendered by making
allowances for the radar beam’s absorption as it penetrates the precipitation cell. The
PAC alert puts into view those areas which absorb the radar beam.
The heading to these areas is shown by a yellow arc at the edge of the radar display.
All precipitation in the sector between the displayed weather targets and the yellow
PAC alert arc may be incorrect and should be avoided.
DISPLAY LEVEL RAINFALL RATE (MM/HR) RAINFALL RATE (INCHES/HR)
6 (magenta) Turbulence Turbulence
5 (yellow) PAC (path attenuation correction) PAC (path attenuation correction)
4 (magenta)
Intense > 51 > 2.0
3 (red)
Strong > 12.7 - 51 > 0.5 - 2.0
2 (yellow)
Moderate > 3.8 - 12.7 > 0.15 - 0.5
1 (green)
Weak > 0.76 - 3.8 > 0.03 - 0.15
0 (black) > 0.15 - 0.76 > 0.006 - 0.03
Weather Radar Display Levels
Table 17-5
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-21
P I LOT T R A I N I N G GU I D E
Weather Radar Display Modes
Refer to the “Collins Pro Line 4 Avionics System for the Challenger 604” Pilot’s
Guide for additional operational information on the weather radar system.
Test Mode
Selecting TEST mode initiates the weather radar RTA functional self-test. The TEST
mode ensures that the MFDs are capable of processing and displaying the weather data
represented by various colors. Six colored arcs show on the MFD in TEST. The fifth
arc changes between red and magenta on alternate sweeps.
The transmitter is disabled in TEST mode, but antenna scan and tilt functions remain
operational.
Weather Radar Test Display
Figure 17-13
THE AREA WITHIN THE SCAN ARC AND WITHIN TWO FEET
OF AN OPERATING WEATHER RADAR SYSTEM
CONSTITUTES A HAZARDOUS AREA. DO NOT OPERATE
THE SYSTEM IN ANY MODE OTHER THAN TEST WHEN THE
ANTENNA MIGHT SCAN OVER PERSONNEL. DO NOT
OPERATE THE RADAR INSIDE A HANGAR.
WARNING
30
33 340 N
3
50
ADF 1 ADF 2
100
LX/WX+TRB+GCS G+3 USTB T+10.7
UTC 11:42 TAS 250 GS 254 SAT 12 C TAT -15 C
VOR1
CID
CRS 350
30.0NM
　
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