737-600/700/800/900 FAULT ISOLATION MANUAL 故障隔离手册 导航(47)

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801.
6) 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.
(g)  If you do not find a problem with the wiring, then do these steps and continue: 1) For the left ADIRU, re-connect the connector D3691 to the left static ADM. 2) For the right ADIRU, re-connect the connector D3697 to the right static ADM.
(3)  Install a new applicable 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 ---------------------------
818.  No Baro 1 Data -Fault Isolation
A.  Description
(1)  
This task is for this maintenance message:

(a)  34-21029 NO BARO 1 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 the BARO 1 data from the display electronic unit (DEU).

(4)  
This fault causes the status code 29 to show on the inertial system display unit (ISDU).

B.  Possible Causes
(1)  
DEU 1, M1808 or DEU 2, M1809.

(2)
ADIRU, M1749 (left) or M1752 (right).

(3)
Wiring problem between the DEU and the ADIRU.

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

D.  Related Data
(1)
(SSM 34-21).

(2)
(WDM 34-21).

EFFECTIVITY

34-21 TASKS 817-818
SIL ALL
Page 236 D633A103-SIL Oct 15/2008

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

(a)  If there is a maintenance message for a DEU or EFIS control panel failure, then go to the fault isolation task for the applicable maintenance message to correct the fault.
1)  For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

2)  If the ADIRS maintenance message does not show on the CDU, and the status code does not show on the ISDU, then you corrected the fault.
3)  If the ADIRS maintenance message shows on the CDU, and the status code shows on the ISDU, then continue.
(b)  If there is no maintenance message for a DEU or EFIS control panel failure, then continue.
(2) 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.
　
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