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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-041
General
When the ADIRUs are in the alignment mode and the ADIRUs
detect airplane movement, the alignment mode stops. A status
code 3 shows on the ISDU and IRS MOTION shows on the CDU
scratchpad. After 30 seconds, the ADIRUs do a check for
airplane motion. When the motion stops, the ADIRUs start new
alignments. When the new alignment starts, the status code 3
goes out of view. You push the CLR key on the CDU to remove
the IRS MOTION message from the CDU scratchpad.
NOTE: The display selector must be in the HDG/STS position
to see the status code 3.
ADIRS - IRS MOTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-042
ADIRS - IRS MOTION
ADIRS - IRS MOTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-042
General
The ADIRU keeps a record of its last position. You must enter
position data during the alignment mode. When you enter
position data that is more than 1 degree different than the
recorded latitude or 1 degree different than the recorded
longitude, these things occur:
* ALIGN light flashes
* Status code 4 shows on ISDU
* ENTER IRS POSITION shows on CDU.
Enter the same position data again to cause these to occur:
* Align light on (no flash)
* Status code 4 goes out of view
* ENTER IRS POSITION goes out of view.
NOTE: The ADIRU does not calculate longitude. The ADIRU
will not detect an incorrect longitude entry after
alignment is complete.
ADIRS - POSITION DIFFERENCE DURING ALIGNMENT
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-043
ADIRS - POSITION DIFFERENCE DURING ALIGNMENT
ADIRS - POSITION DIFFERENCE DURING ALIGNMENT
EFFECTIVITY
SHZ ALL 34-21-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-043
General
At the end of the alignment period, if the ADIRU calculated
latitude is different than the latitude you entered, you will see
these conditions:
* ALIGN light flash
* SET IRS POSITION shows on CDU
* Alignment time shows 0 on ISDU
* Status code out of view on ISDU.
If you enter the same latitude again, you will see these
conditions:
* ALIGN light on
* FAULT light on
* SET IRS POSITION on CDU goes out of view
* Alignment time shows 0 on ISDU
* Status code 2 shows on ISDU.
One of these will cause a latitude difference:
* ADIRU calculated latitude error
* Latitude entry error.
ADIRU Calculated Latitude Error
A calculated latitude error usually will occur in one ADIRU. If the
position difference is in one ADIRU, start a new alignment. If the
new alignment has a position difference, refer to
troubleshooting procedures in part two of the maintenance
manual.
Latitude Entry Error
A latitude entry error gives the wrong latitude to both ADIRUs. If
the position difference is in the left and right ADIRU, correct
position can be entered without starting a new alignment.
ADIRS - POSITION DIFFERENCE AFTER ALIGNMENT 1
EFFECTIVITY
SHZ ALL 34-21-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-044
ADIRS - POSITION DIFFERENCE AFTER ALIGNMENT 1
ADIRS - POSITION DIFFERENCE AFTER ALIGNMENT 1
EFFECTIVITY
SHZ ALL 34-21-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-044
Correct Position Entry
Move the mode selector on the MSU to ALIGN. Use the
keyboard on the ISDU to enter the correct latitude and
longitude. The FAULT light goes off when the correct latitude
is entered.
Move the mode selector to NAV. The ALIGN lights go out and
the ADIRUs enter navigation mode.
If the ADIRUs do not enter the navigation mode, start a new
alignment. Refer to the fault isolation manual (FIM) section 34-
　
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