(2)  For the right ADIRU:
EFFECTIVITY SIL ALL  34-21 TASK 815 
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(a)  Make sure that this circuit breaker is closed:
F/O Electrical System Panel, P6-1
Row Col Number Name
C 15 C00426 ADIRU RIGHT EXC

(3)  
Do
the
applicable
ADIRS
BITE
procedure
(34-21
TASK
801).

(4)  
If the maintenance message does not show on the CDU and the status code does not show on the ISDU, then you corrected fault.

(5)  
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)  Do this check for a 28v ac reference signal at the applicable ADIRU connector:
(a)  
Remove the 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:
1) Remove the safety tag and close this circuit breaker:

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

(c)  
For the right ADIRU:
1) Remove the safety tag and close this circuit breaker:

F/O Electrical System Panel, P6-1 Row Col Number Name C 15 C00426 ADIRU RIGHT EXC

(d)  
For the left ADIRU, do a check for a 28v ac from pin 10 to pin 4 (ground) of the connector D3687C.

(e)  
For the right ADIRU, do a check for a 28v ac from pin 10 to pin 4 (ground) of the connector D3693C.

(f)  
If there is a 28v ac at connector D3687C and D3693C, then do these steps:

1) Replace the 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.
2) For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
3) 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.
(g)  If there is not 28v ac at connector D3687C or D3693C, then continue.
(2)  Do this check of the wiring between the applicable ADIRU and the 28v ac circuit breaker connector:
(a)  For the left ADIRU:
EFFECTIVITY SIL ALL  34-21 TASK 815 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 230 Oct 15/2008 

CAPT Electrical System Panel, P18-1 Row Col Number Name E 7 C01007 ADIRU LEFT AC
CAPT Electrical System Panel, P18-2 Row Col Number Name E 8 C00425 ADIRU LEFT EXC
(b)  For the right ADIRU: 1) Make sure that these circuit breakers are open and have safety tags:
F/O Electrical System Panel, P6-1
Row  Col  Number  Name 
C  14  C01008  ADIRU RIGHT AC 
C  15  C00426  ADIRU RIGHT EXC 

(c)  
For the left ADIRU, disconnect connector D41809P from the P18-2 panel.

(d)  
For the right ADIRU, disconnect connector D46065P from the P6-1 panel.

(e)  
For the left ADIRU, do a wiring check between these pins of connector D3687C for the ADIRU and connector D41809P:

D3687C  D41809P
pin10 -------------------pin4

(f)  For the right ADIRU, do a wiring check between these pins of connector D3693C for the ADIRU and connector D46065P:
D3693C  D46065P
pin10 -------------------pin7
　
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