*
Six linear accelerometers
*
Four processors
*
Three power supplies
* Three dual channel ARINC 629 input/output interfaces.
Software Loading
The ADIRU can receive operational program software (OPS) from the AIMS cabinets through the flight controls ARINC 629 buses.
Air Data Function
The ADIRU uses data from the air data sensors to make air data calculations.
Inertial Reference Data Function
The ADIRU uses the data from the accelerometers and gyros to calculate inertial navigation data.
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ADIRS -ADIRU
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ADIRS -ADIRU REMOVAL AND LOCK BAR OPERATION
Locking Bar
The locking bar prevents these:
*
Removal of the ADIRU until you disconnect the ARINC 629 connections
*
Connection of the ARINC 629 interfaces until you install and secure the ADIRU.
Training Information Point
You must use a 1/4 inch hex wrench to turn the ADIRU installation screws.
Do these steps to remove the ADIRU and operate the locking bar:
*
Remove all six connectors
*
Slide the locking bar up until it covers the three connectors
*
Use a hex wrench to loosen the installation screws
*
After you loosen the screws, a spring moves them out and they hold the locking bar up
*
Remove the ADIRU.
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ADIRS -ADIRU INSTALLATION
ADIRU Installation
Put the ADIRU on the rack and align the two alignment pins in the back of the ADIRU and one pin in the front of the ADIRU.
Do these steps to install the ADIRU:
*
Install the ADIRU in the rack
*
Tighten the screws
*
Slide the locking bar down
*
Install the six connectors and make sure they are in the full lock position.
Training Information Point
When the ADIRU is secured to the mounting tray, the locking bar is in the down position. Make sure all connectors are in the full lock position before you apply power. You cannot operate the ADIRU if it is not properly installed.
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ADIRS -ADIRU RELIABILITY AND FAULT TOLERANCE
General
The ADIRU has fault containment areas (FCAs). The FCAs have fault containment modules (FCMs).
The ADIRU has redundancy features that make it more reliable. If a module fails, the ADIRU adjusts itself to use only those components that are good.
Fault Containment Areas and Fault Containment Modules
There are seven FCAs in the ADIRU. In each FCA there are FCMs. These are the FCAs and their FCMs:
*
Gyro: 6 laser gyro FCMs
*
Accelerometer: 6 accelerometer FCMs
*
Power supply: 3 power supply FCMs
*
Processor: 4 processor FCMs
*
Left, center, and right ARINC 629 interface: 2 ARINC 629 I/O modules in each.
Each FCM is physically and electrically separate from all other like FCMs.
FCMs in the same FCA are the same and interchangeable by shop personnel only.
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Single Failures In A Fault Containment Area
If a single FCM fails in one FCA or if there are single FCM failures in more than one FCA, the ADIRU sends data to AIMS to make a maintenance memo show on the maintenance access terminal (MAT). The maintenance memo is ADIRS and it shows on the maintenance planning page.
The flight crew will not see a flight deck effect.
Multiple Failures In The Same FCA
If there are two FCM failures in the same FCA, the ADIRU sends data to AIMS to make a maintenance message show on the MAT, and the status message ADIRU shows on the EICAS display.
More Failures
The ADIRU must have at least these components in order to supply inertial reference data:
*
4 gyros
*
4 accelerometers
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