(g)  
If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) For the left ADIRU, re-connect connector D41809P to the P18-2 panel. 3) For the right ADIRU, re-connect connector D46065P to the P6-1 panel. 4) Re-install the ADIRU. To install it, do this task: Air Data Inertial Reference Unit

Installation, AMM TASK 34-21-01-400-801. 5) For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
a) If the maintenance message does not show on the CDU and the status code does not show on the ISDU, then you corrected fault.

(h)  
If you do not find a problem with the wiring, then do these steps and continue: 1) For the left ADIRU, re-connect connector D41809P to the P18-2 panel. 2) For the right ADIRU, re-connect connector D46065P to the P6-1 panel.

(3)  Intall 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 ---------------------------816. No Pitot ADM Data -Fault Isolation
EFFECTIVITY SIL ALL  34-21 TASK 815 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 231 Oct 15/2008 

A.  Description
(1)  
This task is for this maintenance message:

(a) 34-21027 NO PITOT ADM DATA

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

(3)  
This message shows when the ADIRU does not receive signal from the pitot air data module (ADM).

(4)  
This fault causes the status code 27 to show on the inertial system display unit (ISDU).

(5)  
This fault causes the SPD flag to show on the airspeed indicator and the ALT flag to show on the altimeter indicator.

B.  Possible Causes
(1)  
Pitot ADM, M1750 (left) or M1753 (right).

(2)
Wiring between pitot ADM and ADIRU.

(3)
ADIRU, M1749 (left) or M1752 (right).

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
applicable
ADIRU,
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.

EFFECTIVITY SIL ALL  34-21 TASK 816 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 232 Oct 15/2008 

F. Fault Isolation Procedure
(1)
Replace the applicable pitot ADM.
These are the tasks:
　
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