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

(2)  
Do the test of the AOA sensor in this task: Angle of Attack Sensor -Inspection, AMM TASK 34-21-05-200-801.

(a)  
If the test is unsatisfactory, then replace AOA sensor. These are the tasks: Angle of Attack Sensor Removal, AMM TASK 34-21-05-000-801, Angle of Attack Sensor Installation, AMM TASK 34-21-05-400-801. 1) Re-run the test of the AOA sensor in this task: Angle of Attack Sensor -Inspection,

AMM TASK 34-21-05-200-801.
a) If AOA sensor test is satisfactory, then you corrected the fault.
b) If the test is unsatisfactory, then continue.

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

(3)  
Do the test of the TAT probe in this task: Air Data Reference -System Test, AMM
TASK 34-21-00-730-802.

(a)  
If the test is unsatisfactory, then replace TAT probe. These are the tasks: Total Air Temperature Probe Removal, AMM TASK 34-21-06-000-801, Total Air Temperature Probe Installation, AMM TASK 34-21-06-400-801.

TASK 34-21-00-730-802.
a) If TOT probe test is satisfactory, then you corrected the fault.
b) If the test is unsatisfactory, then continue.

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

(4)
Replace the applicable 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.

EFFECTIVITY SIL ALL  34-21 TASK 840 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 276 Oct 15/2008 

(a) If the test in the installation task for the ADIRU is satisfactory, then you corrected the fault.
-------------------------END OF TASK ---------------------------
841. No ADR Data -Fault Isolation
A.  Description
(1)  
This task is for this maintenance messages:

(a) 34-21018 NO ADR 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 34-21018 shows when the inertial reference does not receive data from the air data reference.

(4)  
This faults cause the status code 18 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

EFFECTIVITY

34-21 TASKS 840-841
SIL ALL
Page 277 D633A103-SIL Oct 15/2008

D.  Related Data
(1)
(SSM 34-21).

(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)  
　
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