(3)
This message shows when the ADIRU detects airplane movement during the alignment mode, the alignment process will suspend but will start alignment again after the airplane stops moving for at least 30 seconds.
(4)
This condition causes the IRS MOTION message to show on all pages of the CDU and the status code 03 to show on the inertial system display unit (ISDU)..
B. Possible Cause
(1)
Airplane moves during the alignment
(2)
Cross wind
NOTE: If high wind condition occurs, turn the aircraft nose into the wind prior to alignment or have the aircraft aligned in the hangar before you tow the aircraft to the flight line.
C. Initial Evaluation
(1) To clear the maintenance message, make sure the airplane is not moving while the ADIRU is in the alignment mode. No maintenance action is required.
NOTE: Approximately 30 seconds after the airplane stops moving, the ADIRU will automatically start a new alignment.
If present position was entered before the light flashed, it is not necessary to enter it again.
-------------------------END OF TASK ---------------------------
EFFECTIVITY
34-21 TASKS 803-804
SIL ALL
Page 208 D633A103-SIL Oct 15/2008
805. Align Fault -Fault Isolation
A. Description
(1)
This task is for this maintenance message:
(a) 34-21004 ALIGN FAULT
(2)
The maintenance message is identical for the left and right air data inertial reference systems (ADIRS). The left ADIRS maintenance message is shown on the ADIRS L BITE page on the control display unit (CDU). The right ADIRS maintenance message is shown on the ADIRS R BITE page on the CDU.
(3)
The ADIRU keeps a record of its last position. You must enter the present position data during the alignment mode.
(4)
This message shows when you enter position data that is more than 1 degree different than the recorded latitude or 1 degree different than the recorded longitude.
(5)
This condition causes the ALIGN light on the mode select unit (MSU) to flash, the status code 04 to show on the inertial system display unit (ISDU) and ENTER IRS POSITION message to show on CDU.
B. Possible Cause
(1) The entered present position is more than ±1 degree different than the present position stored in memory.
NOTE: This can occur when an ADIRU is replaced (if the ADIRU was turned off at a different location). It can also occur for other reasons.
NOTE: If this condition occur, the ALIGN light on the mode select unit (MSU) will flash, enter the present position again to align the ADIRU.
NOTE: You might need to enter the data three times.
(2) ADIRU, M1749 (left) or M1752 (right).
C. Circuit Breakers
(1) These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-1
Row Col Number Name
E 5 C01009 ADIRU LEFT DC
E 7 C01007 ADIRU LEFT AC
CAPT Electrical System Panel, P18-2
Row Col Number Name
E 8 C00425 ADIRU LEFT EXC
F/O Electrical System Panel, P6-1
Row Col Number Name
C 14 C01008 ADIRU RIGHT AC
C 15 C00426 ADIRU RIGHT EXC
C 17 C01010 ADIRU RIGHT DC
D. Related Data
(1)
(WDM 34-61-14)
(2)
(WDM 34-21-12)
EFFECTIVITY SIL ALL 34-21 TASK 805
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 209 Oct 15/2008
E. Initial Evaluation
(1)
Use the CDU to enter the correct present position again.
(2)
Do
the
applicable
ADIRS
BITE
procedure
(34-21
TASK
801).
