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applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
5) If the maintenance message does not show on the CDU, then you corrected the fault.
(f)  If you do not find a problem with the wiring, then do these steps:
1)  Re-install the ADMs. To install them, do these tasks: Pitot Air Data Module Installation, AMM TASK 34-21-04-400-801, Static Air Data Module Installation, AMM TASK 34-21-04-400-802.
(2) Replace the applicable ADIRU. These are the tasks: Air Data Inertial Reference Unit Removal, AMM TASK 34-21-01-000-801, Air Data Inertial Reference Unit Installation, AMM TASK 34-21-01-400-801.
(a)  If the test in the installation task for the ADIRU is satisfactory, then you corrected the fault.
-------------------------END OF TASK ---------------------------
807.  Enter Present Position -Fault Isolation
A.  Description
(1)  
This task is for this maintenance message:

(a)  34-21008 ENTER PPOS

(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)  
A present position must be entered to the ADIRU during the alignment period.

(4)  
This message shows if the alignment period ends and present position has not been entered to the ADIRU.

(5)  
This condition also causes the ALIGN light on the mode select unit (MSU) to flash, the status code 08 to show on the inertial system display unit (ISDU) and ENTER IRS POSITION message to show on CDU.

B.  Possible Causes
(1)  The present position was not entered during the alignment period.
EFFECTIVITY

34-21 TASKS 806-807
SIL ALL
Page 213 D633A103-SIL Oct 15/2008

C.  Initial Evaluation
(1)  To clear this maintenance message, you must enter the present position from the CDU or ISDU. No maintenance action is required.
-------------------------END OF TASK ---------------------------
808. ADIRS Enter Heading -Fault Isolation
A.  Description
(1)  
This task is for this maintenance message:

(a) 34-21009 ENTER HEADING

(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)  
This message shows when the ADIRU is in the attitude mode and does not receive the magnetic heading data from CDU or ISDU.

(4)  
This condition causes the status code 09 to show on the ISDU.

B.  Possible Causes
(1)  The magnetic heading data was not entered during the attitude mode.
C.  Initial Evaluation
(1)  To clear this maintenance message, you must enter the present magnetic heading data from the CDU or ISDU. No maintenance action is required.
-------------------------END OF TASK ---------------------------
809. ISDU Power Loss -Fault Isolation
A.  Description
(1)  
This task is for this maintenance message:

(a) 34-21010 ISDU POWER LOSS

(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 inertial system display unit (ISDU) gets 28v dc from the left and the right ADIRU.
　
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