can see the list of ADIRS maintenance codes on the CDU.
The list is a part of the ADIRS BITE.
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General
The ADIRS has maintenance information that you can get
access to through the flight management computer control
display unit (CDU).
To see the maintenance information, select ADIRS on line
select key (LSK) 4L from the MAINT BITE INDEX. This shows the
ADIRS BITE page.
On the ADIRS BITE page, select either ADIRS L on LSK 1L or
ADIRS R on LSK 2L. This shows the ADIRS BITE main menu for
the left ADIRU or the right ADIRU.
ADIRS BITE Main Menu
There are four maintenance procedures that you can select
through the ADIRS BITE main menu. These are the selections:
* Current status
* Inflight faults
* Ground test
* Ident/config.
To show the current status, select LSK 1L.
To show the inflight faults, select LSK 2L.
To operate a ground test, select LSK 3L.
To show the identification and configuration information, select
LSK 4L.
The input monitoring line is not active.
Select LSK 6l to return to the ADIRS BITE page.
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General
To show the current status, select CURRENT STATUS on line
select key (LSK) 1L from the ADIRS L BITE MAIN MENU. This
shows the CURRENT FAULTS page.
It shows active faults detected by the ADIRU. If there are no
active faults detected by the ADIRU, the message page NO
CURRENT FAULTS shows.
CURRENT FAULTS Page
Three faults show on a page. The number of current faults
pages show on the top right. To show the next current faults
page, select the NEXT PAGE key on the FMC CDU keypad.
The faults show in the order that the ADIRU detects the faults. If
the ADIRU detects a new fault while current faults show, the
new fault shows after the last detected fault.
This information shows for a fault:
* Maintenance message number
* Fault description.
The maintenance message number is a number assigned to the
fault. You can use the maintenance message number index in
the fault isolation manual (FIM) to find the correct fault isolation
procedure to fix the fault.
The fault description is a short description of the fault.
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General
To show the inflight faults, select INFLIGHT FAULTS on line
select key (LSK) 2L from the ADIRS L BITE MAIN MENU. This
shows the INFLIGHT FAULTS MENU page.
The ADIRU stores faults for up to 9 flight legs. The ADIRU can
store up to 26 faults for each flight leg.
A new flight leg starts when the airplane takes off. The flight leg
ends when the airplane lands. If a fault occurs on the ground,
the ADIRU stores the fault as a current fault. If the fault exists
when a new flight leg starts, the ADIRU stores the fault in the
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