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INERTIAL REFERENCE SYSTEM (IRS) (CONT'D)
EICAS Messages
MESSAGE MEANING
IRS 3 ALIGNING IRS 3 is in align mode or ATT mode with no IRS 3 INOP status message.
IRS 1 (2) (3) DC FAIL Indicates the respective IRS DC power supply failed.
IRS 1 (2) (3) IN ATT Indicates the respective IRS is operating in attitude mode.
IRS 3 INOP Indicates a failure of IRS 3.
IRS 1 (2) (3) ON BATT Indicates the respective system is operating on backup battery power.
IRS 1 (2) (3) OVERTEMP Indicates an overtemperature condition in the respective IRU.
WEATHER RADAR SYSTEM
Description
The weather radar consists of a single unit that detects wet precipitation and precipitation-related
turbulence along the flight path of the aircraft. A ground mapping function is incorporated to assist
with navigation. An optional lightning detection system adds lightning detection to the weather
radar displays.
The radar transceiver processes weather radar/turbulence data into a digital bus format that may
be selected for display on the pilot’s or copilot’s multifunction display (MFD).
The baseline weather radar system includes one weather radar control panel (WXP) that allows
selection of various operating modes. An optional second WXP may be installed to provide a
split-scan capability. The display control panels (DCPs) control selection of the weather radar
overlay and radar range on the MFDs.
Components and Operation
Receiver Transmitter Antenna (RTA)
The receiver transmitter antenna is an integrated unit with a 12-inch flat-plate antenna. The
radar scan is ±60 degrees of the aircraft heading, and the selectable antenna tilt angle is ±15
degrees above and below the horizontal.
The RTA is powered by DC bus 1.
Weather Radar Control Panel (WXP)
The weather radar panel provides all the operating controls, except range and weather radar
overlay control, to the weather radar RTA. In single WXP installations, control selections are
sent to both channels of the radar, and identical reflectivity data shows on both MFD displays.
The WXP(s) are powered by DC bus 1.
In dual-WXP installations, individual control selections are sent to separate radar channels. This
provides a split-scan capability, where the radar functions like two independent radars. The
pilot’s WXP controls the left side weather radar display, and the copilot’s WXP controls the right
side display. Each weather radar overlay updates on alternate sweeps of the antenna; the pilot’s
on the clockwise sweep and the copilot’s on the counterclockwise sweep.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−11
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WEATHER RADAR SYSTEM (CONT'D)
Weather Radar Control Panel (WXP)
Figure 17−10−10
Mode Knob
The mode knob selects the weather radar operating mode. Available modes are:
• OFF
• TEST (test mode)
• MAP (ground mapping mode)
• WX (weather)
• WX+T (weather and turbulence)
• TURB (turbulence only)
Annunciation of the selected mode is displayed on the MFD weather radar mode line.
Sector Control (SEC) Button
Pushing the SEC button on the WXP alternately selects or deselects sector scan mode. When
selected, radar scans ±30 degrees from aircraft heading. When deselected, normal ±60° scan
is resumed.
Transfer Control (XFR) Button
Pushing the XFR button on the WXP alternately selects or deselects the transfer function. In
single-WXP installations, weather radar range control transfers to the cross-side DCP when
the XFR function is selected.
In a dual-WXP installation, operation of the XFR button transfers complete weather radar
control to the cross-side WXP and DCP (range, mode, gain and tilt). The cross-side WXP and
DCP units control both MFD radar displays. Transfer is allowed on one side only, and the pilot
has priority.
When transfer is selected, an “X” annunciates on both MFD radar mode lines, and the slaved
side line is shown in yellow. The weather radar message RADAR NOT AT THIS RANGE will
appear on the slaved side anytime MFD range disagrees with the master side.
Stabilization Control (STAB) Button
Pushing the STAB button on the WXP alternately selects or deselects antenna stabilization.
Normally, antenna stabilization is selected to automatically stabilize the radar antenna with
attitude input data from the IRS system. This provides a constant antenna scan attitude,
regardless of the aircraft pitch and roll attitudes.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−12
REV 66, Feb 01/07
　
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