(d)  For the right ADIRU and right AOA sensor, do a wiring check between these pins of connector D10017 for the AOA sensor and connector D3693A for the ADIRU:
D10017  D3693A
pin3 -------------------pinJ7 pin4 -------------------pinH7 pin5 -------------------pinK7

(e)  If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Re-install the ADIRU. To install it, do this task: Air Data Inertial Reference Unit
Installation, AMM TASK 34-21-01-400-801. 3) Re-install the AOA sensor. To install it, do this task: Angle of Attack Sensor
Installation, AMM TASK 34-21-05-400-801. 4) For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
5) If the maintenance messages does not show on the CDU and the status code does not
show on the ISDU, then 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 AOA sensor. To install it, do this task: Angle of Attack Sensor Installation, AMM TASK 34-21-05-400-801. a) If the test in the installation task for the AOA Sensor is satisfactory, then you
corrected the fault. b) If the test in the installation task for the AOA Sensor is unsatisfactory, then continue.
(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 ---------------------------
815.  No AOA Reference Signal -Fault Isolation
A.  Description
(1)  This task is for this maintenance message:
(a)  34-21024 NO AOA REF SIGNAL
EFFECTIVITY

34-21 TASKS 814-815
SIL ALL
Page 228 D633A103-SIL Oct 15/2008

(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 28v ac stby bus supplies a servo reference voltage to the left ADIRU and to the left angle of attack (AOA) sensor. The 28v ac xfr bus 2 supplies servo reference voltage to the right AIDRU and to the right AOA sensor.

(4)  
This message shows when the ADIRU does not receive a 28v ac reference signal.

(5)  
This fault causes the status code 24 to show on the inertial system display unit (ISDU).

(6)  
This fault causes the ALT flag to show on the altimeter indicator and the SPD flag to show on the airspeed indicator.

B.  Possible Causes
(1)
Wiring problem

(2)  
ADIRU LEFT EXCITE circuit breaker, C425 or ADIRU RIGHT EXCITE circuit breaker, C426

(3)  
AOA

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)

(2)
(WDM 34-21)

E.  Initial Evaluation
(1)  For the left ADIRU:
(a) Make sure that this circuit breaker is closed:
　
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