AIRPLANE
OPERATIONS
MANUAL
ABNORMAL
PROCEDURES
REVISION 40
1-03-59
Page
1
Code
03
AOM-145/1114
NAVIGATION
AHRS ALIGNMENT
EICAS ADVISORY: AHRS 1 (2) ALN
This message is normally presented during alignment phase. No
action is required.
AHRS ALIGNMENT FAULT
EICAS CAUTION: AHRS 1 (2) ALN FAULT
LIGHT: Master Caution
Check and reenter present position. If necessary, reenter present
position once again.
AHRS ATTITUDE MODE
EICAS ADVISORY: AHRS 1 (2) ATT MODE
Associated AHRS Reversionary Button ....................... PRESS
If cross-side AHRS is not available:
Maintain wings level and constant airspeed until AHRS 1 (2) ALN
message is no longer displayed and attitude is recovered
(approximately 20 seconds).
CAUTION:
• ATTITUDE OUTPUTS ARE NOT AS ACCURATE AS
IN THE NORMAL OPERATIONAL MODE.
• AHRS MAGNETIC HEADING IS NOT AVAILABLE.
NOTE: The Autopilot is not available while AHRS 1 (2) ALN is
being displayed.
AHRS BASIC MODE
EICAS ADVISORY: AHRS 1 (2) BASIC MODE
Affected AHRS is reverted to the basic mode due to the TAS signal
lost.
AHRS EXCESSIVE MOTION
EICAS ADVISORY: AHRS 1 (2) EXC MOTION
Make sure the airplane is completely stationary.
The AHRS will restart a full alignment 30 seconds after the motion is
stopped.
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