(2)  
The maintenance message is identical for the left and right air data inertial reference systems (ADIRS). The left ADIRU maintenance message is shown on the ADIRS L BITE page on the control display unit (CDU). The right ADIRU maintenance message is shown on the ADIRS R BITE page on the CDU.

(3)  
This message shows when the ADIRU receives an invalid signal from pitot air data module (ADM).

(4)  
This fault causes the status code 32 to show on the inertial system display unit (ISDU).

B.  Possible Causes
(1)  
Pitot ADM, M1750 (left) or M1753 (right).

(2)
ADIRU, M1749 (left) or M1752 (right).

C.  Circuit Breakers
(1)  These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-1
Row Col Number Name
E 5 C01009 ADIRU LEFT DC
E 7 C01007 ADIRU LEFT AC

CAPT Electrical System Panel, P18-2
Row Col Number Name
E 8 C00425 ADIRU LEFT EXC

F/O Electrical System Panel, P6-1
Row Col Number Name
C 14 C01008 ADIRU RIGHT AC
C 15 C00426 ADIRU RIGHT EXC
C 17 C01010 ADIRU RIGHT DC

D.  Related Data
(1)
(SSM 34-21).

(2)
(WDM 34-21).

EFFECTIVITY

34-21 TASKS 819-820
SIL ALL
Page 240 D633A103-SIL Oct 15/2008

E.  Initial Evaluation
(1)  
For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

(2)  
If the maintenance message does not show on the CDU and the status code does not show on the ISDU, then there was an intermittent fault

(3)  
If the maintenance message shows on the CDU, and the status code shows on the ISDU, then do the Fault Isolation Procedure below.

F. Fault Isolation Procedure
(1)
Replace the applicable pitot ADM.
These are the tasks:
Pitot Air Data Module Removal, AMM TASK 34-21-04-000-801,
Pitot Air Data Module Installation, AMM TASK 34-21-04-400-801.

(a)  
For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

(b)  
If the maintenance message does not show on the CDU, and the status code does not show on the ISDU, then you corrected the fault.

(c)  
If the maintenance message shows on the CDU, and the status code shows on the ISDU, then continue.

(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 ---------------------------
821. Static ADM Data Invalid -Fault Isolation
A.  Description
(1)  
This task is for this maintenance message:

(a)  34-21033 STATIC ADM DATA INVLD

(2)  
The maintenance message is identical for the left and right air data inertial reference systems (ADIRS). The left ADIRU maintenance message is shown on the ADIRS L BITE page on the control display unit (CDU). The right ADIRU maintenance message is shown on the ADIRS R BITE page on the CDU.

(3)  
This message shows when the ADIRU receives an invalid signal from static air data module (ADM).

(4)  
This fault causes the status code 33 to show on the inertial system display unit (ISDU).

B.  Possible Causes
(1)  
Static port.

(2)  
Static ADM, M1751 (left) or M1754 (right).
　
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