(3)  
For
the
DEU
1,
do
this
task:
CDS
BITE
Procedure,
31-62
TASK
801.

(a)  
If there is a fault message that relates to the DEU 1 internal fault, the captain’s EFIS displays, or the left ADIRU; then go to the FIM task to clear that message.

(b)  
After you clear the DEU 1 maintenance messages, if the observed fault does not show on the captain’s EFIS display, then you corrected the fault.

(c)  
After you clear the DEU 1 maintenance messages, if the observed fault continues to show on the captain’s EFIS display, then continue.

(4)  
Do this check of the left ADIRU:

EFFECTIVITY SIL ALL  34-21 TASK 827 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 255 Oct 15/2008 

(a)  Open these circuit breakers and install safety tags:
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
(b)  
Align the left ADIRU in the NAV mode.

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

1) Replace the left 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 captain’s EFIS display, then do this step and continue. 1) Remove the safety tags and close these circuit breakers:

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
(5)
Replace the DEU 1. 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 captain’s EFIS display, then you corrected the fault.

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

(6)  
Do this check of the wiring between the ADIRUs and the DEU 1:

(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 1. 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, D3973B, and D3973D:

EFFECTIVITY SIL ALL  34-21 TASK 827 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 256 Oct 15/2008 

D3687A  D3973B
pinA5 ------------------pinC5 pinB5 ------------------pinD5
D3687A  D3973D
pinA5 ------------------pinE5 pinB5 ------------------pinF5

(d)  For the right ADIRU, do a wiring check between these pins of connectors D3693A, D3973A, and D3973E:
D3693A  D3973A
pinA9 ------------------pinJ15 pinB9 ------------------pinK15
D3693A  D3973E
pinA9 ------------------pinC5 pinB9 ------------------pinD5

(e)  If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Re-install the DEU 1. To install it, do this task: Display Electronic Unit Installation,
AMM TASK 31-62-21-400-801. 3) Re-install the left and right ADIRUs. To install them, do this task: Air Data Inertial Reference Unit Installation, AMM TASK 34-21-01-400-801. 4) If the observed fault does not show on the captain’s EFIS display, then you corrected the fault.
　
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