(b)  
If the test is satisfactory, then continue.

(2)  
For
the
right
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

(a)  
If there is a right ADIRS fault message that shows on the CDU, then go to the FIM task to clear that message.

(b)  
After you clear the right ADIRS maintenance messages, if the observed fault does not show on the first officer’s EFIS display, then you corrected the fault.

(c)  
After you clear the right ADIRS maintenance messages, if the observed fault continues to show on the first officer’s EFIS display, then continue.

(3)  
For
the
DEU
2,
do
this
task:
CDS
BITE
Procedure,
31-62
TASK
801.

(a)  
If there is a fault message that relates to the DEU 2 internal fault, the first officer’s EFIS displays, or the left ADIRU; then go to the FIM task to clear that message.

(b)  
After you clear the DEU 2 maintenance messages, if the observed fault does not show on the first officer’s EFIS display, then you corrected the fault.

(c)  
After you clear the DEU 2 maintenance messages, if the observed fault continues to show on the first officer’s EFIS display, then continue.

(4)  
Do this check of the right ADIRU:

(a)  
Open these circuit breakers and install safety tags:

F/O Electrical System Panel, P6-1

(b)  
Align the right ADIRU in the NAV mode.

(c)  
If the observed fault does not show on the first officer’s EFIS display, then do these steps:

1) Replace the right 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.

(d)  
If the observed fault shows on the first officer’s EFIS display, then do this step and continue. 1) Remove the safety tags and close these circuit breakers:

EFFECTIVITY SIL ALL  34-21 TASK 828 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 259 Oct 15/2008 

Row  Col  Number  Name 
C  14  C01008  ADIRU RIGHT AC 
C  15  C00426  ADIRU RIGHT EXC 
C  17  C01010  ADIRU RIGHT DC 

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
(5)
Replace the DEU 2. These are the Task: Display Electronic Unit Removal, AMM TASK 31-62-21-000-801, Display Electronic Unit Installation, AMM TASK 31-62-21-400-801.

(a)  
If the observed fault does not show on the first officer’s EFIS display, then you corrected the fault.

(b)  
If the observed fault shows on the first officer’s EFIS display, then continue.

(6)  
Do this check of the wiring between the ADIRUs and the DEU 2:

(a)  
Remove the left and right ADIRUs. To remove them, do this task: Air Data Inertial Reference Unit Removal, AMM TASK 34-21-01-000-801.

(b)  
Remove the DEU 2. 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 connectors D3687A, D3975B, and D3975D:

D3687A  D3975B
pinA9 ------------------pinC5 pinB9 ------------------pinD5

EFFECTIVITY SIL ALL  34-21 TASK 828 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 260 Oct 15/2008 
　
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