(a)
Do a check of the condition of the pins and connector of the applicable ADIRU.

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

1)  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.
2)  If the maintenance message does show on the CDU, and the status code does show on the ISDU, then continue.
(3)  Do this check of the wiring between the applicable ADIRU and DEU:
(a)  
Remove the ADIRU. To remove it, do this task: Air Data Inertial Reference Unit Removal, AMM TASK 34-21-01-000-801.

(b)  
Remove the DEU. To remove it, do this task: Display Electronic Unit Removal, AMM TASK 31-62-21-000-801.

(c)  
For the left ADIRU, do a wiring check between these pins of connector D3973B for the DEU and connector D3687A for the ADIRU:

D3975D  D3687A
pinC7 ------------------pinF15 pinD7 ------------------pinG15

(d)  For the right ADIRU, do a wiring check between these pins of connector D3975B for the DEU and connector D3693A for the ADIRU:
D3975B  D3693A
pinC7 ------------------pinF15 pinD7 ------------------pinG15

(e)  If you find a problem with the wiring, then do these steps:
EFFECTIVITY SIL ALL  34-21 TASK 818 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 237 Oct 15/2008 

1) Repair the wiring. 2) Re-install the DEU. To install it, do this task: Display Electronic Unit Installation, AMM TASK 31-62-21-400-801. 3) Re-install the ADIRU. To install it, do this task: Air Data Inertial Reference Unit
Installation, AMM TASK 34-21-01-400-801. 4) For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
5) If the maintenance messages does not show on the CDU and the status code does not
show on the ISDU, then you corrected the fault.
-------------------------END OF TASK ---------------------------
819. No Baro 2 Data -Fault Isolation
A.  Description
(1)  
This task is for this maintenance message:

(a) 34-21030 NO BARO 2 DATA

(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 does not receive the BARO 2 data from the display electronic unit (DEU).

(4)  
This fault causes the status code 30 to show on the inertial system display unit (ISDU).

B.  Possible Causes
(1)  
DEU 1, M1808 or DEU 2, M1809.

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

(3)
Wiring problem between the DEU and the ADIRU.

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

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.

EFFECTIVITY

34-21 TASKS 818-819
　
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