B.  Possible Causes
(1)  
Static ADM, M1751 (left) or M1754 (right).

(2)
Wiring problem between the ADM and the ADIRU.

(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

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).
EFFECTIVITY

34-21 TASKS 816-817
SIL ALL
Page 234 D633A103-SIL Oct 15/2008

(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)  
Do this check of the wiring between the applicable ADIRU and static ADM:

(a)  
Remove the applicable ADIRU. To remove it, do this task: Air Data Inertial Reference Unit Removal, AMM TASK 34-21-01-000-801.

(b)  
For the left ADIRU, disconnect the connector D3691 from the left static ADM.

(c)  
For the right ADIRU, disconnect the connector D3697 from the right static ADM.

(d)  
For the left ADIRU, do a wiring check between these pins of connector D3691 and connector D3687A for the ADIRU:

D3691  D3687A
pin7 -------------------pinD9 pin8 -------------------pinE9 pin1 -------------------pinG6 pin3 -------------------pinH6 pin5 -------------------pinJ6

(e)  For the right ADIRU, do a wiring check between these pins of connector D3697 and connector D3693A for the ADIRU:
D3697  D3693A
pin7 -------------------pinD9 pin8 -------------------pinE9 pin1 -------------------pinG6 pin3 -------------------pinH6 pn5 --------------------pinJ6

(f)  If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) For the left ADIRU, re-connect the connector D3691 to the left static ADM. 3) For the right ADIRU, re-connect the connector D3697 to the right static ADM.
EFFECTIVITY SIL ALL  34-21 TASK 817 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 235 Oct 15/2008 

Unit Installation, AMM TASK 34-21-01-400-801. 5) For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
　
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