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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 in 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.
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 TEST mode, but antenna scan and tilt functions remain operational.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−16
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
Weather Radar Test Display
Figure 17−10−13
WARNING
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.
Weather Only (WX) Mode
Detectable weather appears as one of four colors: green, yellow, red or magenta. The highest
precipitation rates are represented in magenta.
Weather Plus Turbulence (WX+T) Mode
Weather plus turbulence adds the detection of precipitation-related turbulence targets to the
weather mode. The highest precipitation rates and turbulence show in magenta.
WX+T is operational for ranges less than or equal to 40 NM. When ranges greater than 50 NM
are selected in WX+T mode, the weather radar revers to the WX mode.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−17
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
Turbulence Only (TURB) Mode
The TURB mode on the WXP is a spring-loaded position. Selecting TURB mode removes all
targets except detected precipitation-related turbulence within the 50 NM range. TURB mode is
useful in analyzing areas of precipitation-related turbulence that have been detected while in
the WX+T mode. By removing all weather returns from the display, the areas of turbulence
(magenta) can be observed alone.
Lightning Detection System (Optional)
The lightning detection system maps electrical discharge activity (lightning) 360 degrees around
the aircraft, to a distance of 200 nautical miles. Three levels of electrical activity intensity are
identified. Level one represents the lowest rate of electrical discharge, and level three the
highest.
The system transmits the location of up to 63 thunderstorm cells to the MFDs. The data set is
updated every two seconds. Electrical discharge activity is presented as thunderbolts on the
MFD in yellow, red, and magenta, with yellow signifying level one, and magenta signifying level
three activity.
The lightning detection system is selected by the WX button on the display control panel (DCP).
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−18
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
Controls and Indicators
Weather Radar Control Panel (WXP)
Figure 17−10−14
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−19
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
Display Control Panel (Weather Radar Functions)
Figure 17−10−15
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−20
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
Weather Radar Display
Figure 17−10−16
Weather Radar/Lightning Detection System Messages
Weather radar system and/or lightning detection system failure messages are displayed on the
MFD as shown below:
WXR Range/Control Fault Annunciation
WXR RANGE/CONTROL FAULT ANNUNCIATION DESCRIPTION
RADAR CONTROL FAULT
Range received from the weather radar system
　
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