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Indicates that onside or both inertial
reference systems have failed.
ATT
<0025>
<0015>
<0025>
ATT
MAG
TAT 15C
BRT
TAS 0
WX
UTC 16:13
FMS 2
YUL
TTG
CRS 243
13.0 NM
GS 0 SAT 12C
MAG
Vol. 1 12--50--11
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual
CSP A--013
MASTER
B. Initialization and Alignment
AHRS initialization and operation occurs automatically when electrical power is
established and the aircraft is stationary. Initialization in MAG mode takes about 70
seconds. DG mode requires a much longer time to initialize. In flight, initialization
requires straight, unaccelerated level flight. The primary flight displays (PFD’s) present
a flashing initialization alignment message during initialization.
IRS initialization takes about 7 minutes at normal temperature. The IRS requires that
the initial position be entered using the flight management system (FMS). The primary
flight displays (PFD’s) 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 aircraft is stationary on the ground or in
straight and level flight. <0025>
The magnetic flux detectors used to originate heading information are sensitive to
localized magnetic fields and magnetic anomalies. The effects and the procedural
responses to these conditions are presented in the Collins AHS-85 / 85E Attitude
Heading System Pilot’s Guide.
REV 56, Jan 31/03
Vol. 1 12--50--12
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual MASTER
CSP A--013
Attitude/Heading Source Alignment Indications <MST>
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
Alignment Annunciator (white)
Indicates attitude and heading
alignment in process.
DO NOT TAXI is also displayed
when airplane is on the ground.
DO NOT TAXI
ATT / HDG ALIGNING
<0025>
<0015>
ATT / HDG ALIGNING
DO NOT TAXI
<0025>
<0025>
<0039>
<0039>
IRS 1 OVERTEMP
IRS 2 OVERTEMP
IRS 1 IN ATT
IRS 2 IN ATT
Vol. 1 12--50--13
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual
CSP A--013
MASTER
AHRS ALIGNMENT
Mode Time to Align
MAG
(normal or on the ground)
70 seconds
(No adverse motion sensed by the aircraft;
Normal passenger movement is acceptable.)
DG 10 minutes
Airborne
10 to 35 seconds
(The aircraft must remain in straight and level,
unaccelerated flight.
REV 56, Jan 31/03
Vol. 1 12--50--14
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual MASTER
CSP A--013
IRS --- EICAS Messages <MST>
Figure 12---50---9
Status Page
<0039>
<0039>
IRS 1 OVERTEMP
IRS 2 OVERTEMP
IRS 1 ON BATT
IRS 2 ON BATT
IRS 1 DC FAIL
IRS 2 DC FAIL
IRS 1 IN ATT
IRS 2 IN ATT
IRS 1/2 OVERTEMP Status
(white)
Comes on to indicate that an
overtemperature condition exists.
IRS 1/2 ON BATT Status
(white)
Comes on to indicate that IRS is
operating on back--up power.
IRS 1/2 DC FAIL Status
(white)
Comes on to indicate that IRS
back--up power has failed.
IRS 1/2 IN ATT Status (white)
Comes on to indicate that IRS
is operating in attitude mode.
Vol. 1 12--50--15
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Attitude and Heading Reference System
Flight Crew Operating Manual
CSP A--013
MASTER
C. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
AHRS FAN 1 DC ESS 4 D9
Pilots System
AHRS 1 DC ESS 4 D8
Attitude and
Heading
ATT/HDG 1 MAIN BAT
DIR 5 A8
Systems
(AHRS)
AHRS FAN 2
DC BUS 2 2
　
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