(3)
ADIRU, M1749 (left) or M1752 (right).

EFFECTIVITY

34-21 TASKS 820-821
SIL ALL
Page 241 D633A103-SIL Oct 15/2008

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).

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 static ADM.
These are the tasks:
Static Air Data Module Removal, AMM TASK 34-21-04-000-802,
Static Air Data Module Installation, AMM TASK 34-21-04-400-802.

(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)  
Install a new ADIRU. To install it, do this task: 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 ---------------------------
EFFECTIVITY SIL ALL  34-21 TASK 821 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 242 Oct 15/2008 

822. Baro 1 Data Invalid -Fault Isolation
A.  Description
(1)  
This task is for this maintenance message:

(a) 34-21034 BARO 1 DATA INVLD

(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 ADIRU use the the BARO 1 data from the display electronic unit (DEU) to compute BARO corrected altitude. This message shows when the ADIRU receives an invalid BARO 1 data from the DEU.

(4)  
This fault causes the status code 34 to show on the inertial system display unit (ISDU).

B.  Possible Causes
(1)  
EFIS control panel.

(2)
DEU, M1808 (DEU 1) or M1809 (DEU 2).

(3)
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
　
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