ABNORMAL
PROCEDURES
AIRPLANE
OPERATIONS
MANUAL
1-03-59
Page
10
Code
03
REVISION 37
AOM-145/1114
IRS EXCESSIVE MOTION
EICAS ADVISORY: IRS 1 (2) EXC MOTION
Make sure the airplane is completely stationary.
The IRU will restart a full alignment 30 seconds after the motion is
stopped.
IRS FAIL
EICAS CAUTION: IRS 1 (2) FAIL
During power on or alignment phases:
IRU Mode Select Switch .......................................... OFF
Wait until POWER-OFF phase is finished (MSU annunciator lights
extinguished).
IRU Mode Select Switch .......................................... NAV
In flight:
Reversionary Panel IRS Button ............................... PRESS
If cross-side IRU is not available:
IRU Mode Select Switch ..................................... ATT
Maintain wings level and constant airspeed until attitude display
recovers (approximately 20 seconds).
Magnetic Heading............................................... ENTER
CAUTION:
FOR IRS IN ATTITUDE MODE, NAVIGATION AND
ATTITUDE OUTPUTS ARE NOT AS ACCURATE
AS IN THE NAV MODE. MAGNETIC HEADING
MUST BE ENTERED AND UPDATED
PERIODICALLY FROM THE BEST AVAILABLE
ALTERNATIVE SOURCE, THROUGH THE FMS
CDU.
NOTE: Autopilot is available if the IRS 1(2) ATT MODE
message is displayed and the IRS 1(2) ALN message is
extinguished.
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