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of compass to selected heading.
Lubber Line (white)
Fixed reference for reading
current airplane heading.
Fixed index marks are located
around compass rose at
45 degree increments.
Airplane Symbol (white)
Indicates center of compass
rose.
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Horizontal Situation
Indicator
Compass Rose (white)
Rotating card indicates airplane
current magnetic heading under
fixed lubber line.
Small marks at 5 degree increments.
Larger marks at 10 degree increments.
Digits and cardinal points at 30 degree
increments.
Vol. 1 12--50--6
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
A. Display Reversion
Display capability is maintained when sensor data failure occurs. Either PFD (or MFD
when in PFD format) can be configured to display data from either inertial reference
system by operation of the ATT HDG knob on the source selector panel. Selection of
alternate data sources is indicated to the flight crew by a yellow single source flag on
the PFD and MFD.
Source Selector Panel <1025>
Figure 12---50---5
ATTD HDG
NORM -- Each inertial reference unit
supplies data to the same side display.
1 -- Inertial reference unit 1 supplies
data to both pilot and copilot displays.
An amber source message is displayed
on both PFDs.
2 -- Inertial reference unit 2 supplies
data to both pilot and copilot displays.
An amber source message is displayed
on both PFDs.
Source Selector Panel
Center Pedestal
Vol. 1 12--50--7
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Attitude and Heading Source Selection <1015, 1025>
Figure 12---50---6
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Multifunction Display -- HSI Mode
Pilot’s and Copilot’s Instrument Panels
MAG 1, MAG 2, TRU 1 or TRU 2 (amber)
Indicates heading selection when a single
Inertial reference source has been selected.
Vol. 1 12--50--8
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Attitude/Heading Source Failure Indications <1015,1025>
Figure 12---50---7
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Multifunction Display -- HSI Mode
Pilot’s and Copilot’s Instrument Panels
MAG or TRU Flag (red)
Indicates that onside or both inertial
reference systems are faulty or out
of tolerance.
ATT Flag (red)
Indicates that onside or both inertial
reference systems have failed.
MAG
TAT 15C
BRT
TAS 0
WX
UTC 16:13
FMS 2
YUL
TTG
CRS 243
13.0 NM
GS 0 SAT 12C
MAG
ATT
Vol. 1 12--50--9
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
B. Initialization and Alignment
IRS initialization takes about 7 minutes at normal temperature. The IRS requires that
the initial position be entered using the flight management system. The primary flight
displays present a flashing initialization alignment message during initialization. Upon
successful alignment, the IRS will automatically sequence into navigation mode.
Attitude alignment takes 1 minute or 34 seconds when switching from navigation to
attitude mode, provided the airplane is stationary on the ground or in straight and level
flight. <1025>
Vol. 1 12--50--10
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Attitude/Heading Source Alignment Indication <1015,1025>
Figure 12---50---8
Alignment Annunciator (white)
Indicates inertial reference
alignment in process.
IRS 1 (2) OVERTEMP status (white)
Indicates that an overtemperature
condition exists.
IRS 1 (2) IN ATT status (white)
Indicates that IRS is operating in
attitude mode.
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Status Page
IRS 1 OVERTEMP
IRS 2 OVERTEMP
IRS 1 IN ATT
IRS 2 IN ATT
ATT / HDG ALIGNING
DO NOT TAXI
Vol. 1 12--50--11
FLIGHT INSTRUMENTS
Attitude and Heading Reference System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
　
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