(c)  
For the left ADIRU, do a wiring check between these pins of connector D3687B for the ADIRU and connector D2169 for the ISDU:

D3687B  D2169
pinD1 ------------------pin3 pinD2 ------------------pin4

(d)  For the right ADIRU, do a wiring check between these pins of connector D3693B for the ADIRU and connector D2183 for the ISDU:
D3693B  D2183
pinD1 ------------------pin3 pinD2 ------------------pin4

(e)  If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Re-install the ADIRUs. To install it, do this task: Air Data Inertial Reference Unit
Installation, AMM TASK 34-21-01-400-801. 3) Re-install the ISDU. To install it, do this task: Inertial System Display Unit Installation, AMM TASK 34-21-02-400-801. 4) For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

EFFECTIVITY SIL ALL  34-21 TASK 809 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 216 Oct 15/2008 

you corrected the fault.
(f) If you do not find a problem with the wiring, then do this step and continue:
1)  Re-install the ISDU. To install it, do this task: Inertial System Display Unit Installation, AMM TASK 34-21-02-400-801.
(3)  Install a new ADIRU. To install it, do this task: Air Data Inertial Reference Unit Installation, AMM TASK 34-21-01-400-801.
(a) If the test in the installation task for the ADIRU is satisfactory, then you corrected the fault.
-------------------------END OF TASK ---------------------------
810. No IR Data -Fault Isolation
A.  Description
(1)  
This task is for these maintenance messages:

(a) 34-21031 NO IR DATA

(2)  
The maintenance message is identical for the left and right air data inertial reference systems (ADIRS). The left ADIRS maintenance message is shown on the ADIRS L BITE page on the control display unit (CDU). The right ADIRS maintenance message is shown on the ADIRS R BITE page on the CDU.

(3)  
The maintenance message 34-21031 shows when the air data reference does not receive data from the inertial reference.

(4)  
These faults cause the status code 31 to show on the inertial system display unit (ISDU).

B.  Possible Causes
(1)
ADIRU, M1749 (left) or M1752 (right).

(2)
Wiring problem.

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 809-810
SIL ALL
Page 217 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 ADIRU.
These are the tasks:
　
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