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AS PF
1 2
NORM
IRS
NAVIGATION SYSTEMS
For Training Purposes Only
Jan 04
17-13
P I LOT T R A I N I N G GU I D E
PFD IRS Source Annunciations (Dual IRS Configuration)
Figure 17-8
IRS Reversionary Mode Selectors (Triple IRS Configuration)
Figure 17-9
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.
EICAS Messages
Table 17-4
1.0
260
220
240
280
20
10
10
30
300
400
500
600
8000
TERM
MSG
FMS1
TRU
NO FLIGHT PLAN
TCAS
OFF
29.85 IN
2400M
GS
RA
LNV1
LOC 1
DR FLC
ALTS
FMS1
25
DTK 279
.3
HOKKE
NM
4
4
2
2
1
1
25
3.6
2500M
250
N
33
30
W
24
6
3
7
12000
VOR2
P604_17_072
Switch/
Position
IRS
1
NORM
2
Pilot’s
Side
PFD
—
—
IRS 2
—
—
IRS 1
Copilot’s
Side
IRS Source
Annuciation
IRS2
P604_17_071
L IRS Reversionary Mode
Selector Switch
NORM
ALTN
- Pilot’s systems receive
data from IRS 1
- Pilot’s systems receive data
from IRS 3
L IRS R IRS FMS3
1 2
NORM
NORM ALTN NORM ALTN
R IRS Reversionary Mode
Selector Switch
NORM
ALTN
- Copilot’s systems receive
data from IRS 1
- Copilot’s systems receive
data from IRS 3
NAVIGATION SYSTEMS
17-14 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
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.
NAVIGATION SYSTEMS
For Training Purposes Only
Jan 04
17-15
P I LOT T R A I N I N G GU I D E
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.
Weather Radar Control Panel (WXP)
Figure 17-10
P604_17_065
NORM
-3
-2
-1 +1
2
+3
OFF
TEST
MAP WX
WX+T
TURB
TILT
SEC XFR STAB
PUSH
AUT
O
+
PUSH
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