777 AIRCRAFT MAINTENANCE MANUAL
ADIRS -ALIGNMENT -POS INIT CDU PAGE
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ADIRS -ND AND PFD INDICATIONS DURING ALIGNMENT
General
These are the indications when the ADIRU is in the align mode:
*
The PFDs show no computed data (NCD) attitude, track and heading data
*
The PFDs show ADIRU air data
*
The NDs show NCD track and heading data
*
ADIRU ALIGN MODE memo message shows on the EICAS display.
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ADIRS -ND AND PFD INDICATIONS DURING ALIGNMENT
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ADIRS -PFD AND ND INDICATIONS AFTER ALIGNMENT
General
When the ADIRU alignment completes and the ADIRU is in the NAV mode, the PFD AND ND show attitude and air data from the ADIRU.
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ADIRS -PFD AND ND INDICATIONS AFTER ALIGNMENT
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ADIRS -PFD AND ND INVALID IRS DATA
General
The PFD and ND show the invalid attitude and invalid air data indications.
The PFD shows flags for these displays:
*
Airspeed
*
Attitude
*
Altitude
*
Vertical speed
*
Heading.
The ND shows a heading or track flag.
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777 AIRCRAFT MAINTENANCE MANUAL
ADIRS -PFD AND ND INVALID IRS DATA
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ADIRS -INERTIAL MONITOR PAGE
Purpose
The inertial monitor page shows the position error rate for the ADIRU.
Page Access
To get access to the INERTIAL MONITOR page, select <INERTIAL MONITOR from the MAINTENANCE INDEX page.
Color
All text on this page is white.
Information
Line 1L is the inertial monitor drift. The drift rate is blank in the air.
The drift rate shows for the last completed flight when these conditions occur:
*
Airplane is on the ground
*
Engines are shut down. It clears at the next ground-to-air transition.
Page Selections
Select 6L, <INDEX to show the MAINTENANCE INDEX.
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777 AIRCRAFT MAINTENANCE MANUAL
ADIRS -INERTIAL MONITOR PAGE
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ADIRS -FAULT REPORT AND SOFTWARE DATA LOAD
General
These components in the ADIRS report faults and system status to the central maintenance computing function (CMCF) of the AIMS:
*
ADIRU
*
SAARU
*
ADMs.
You can not start any tests for the ADIRU or the SAARU. These components have built-in test equipment (BITE). The BITE automatically detects faults in these ADIRS components. You start a test of the ADM heat control circuit from the ground test menu on the MAT, chapter 30, ice and rain protection.
ADIRU Power-Up Test and Status
The ADIRU does a 30 second test after you put the ADIRU on/off switch in the on position. The results of the test go to the CMCF of the AIMS. The test is automatic and there are no indications for the test.
The ADIRU starts normal operation after the test ends. The air data is valid after the test. The inertial data is invalid until alignment is complete. The ADIRU continuously supplies BITE status data to the CMCF of the AIMS.
SAARU and ADM Status
The SAARU and the ADMs continuously supply BITE status data to the CMCF of the AIMS.
ADIRS Status Monitoring
If there are faults with the ADIRU, SAARU, ADMs and standby attitude display, use the maintenance access terminal (MAT) to monitor the status.
Software Data Load
Use the MAT to load software data into the ADIRU, SAARU, and the ADMs.
Training Information Point
The ADIRU accepts data load software from the left CMCF only.
The SAARU accepts data load software from the left or right CMCF.
The left ADMs accept data load software from the left CMCF only. The center ADMs accept data load software from the left or right CMCF. The right ADMs accept data load software from the right CMCF only.
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