(b)  
If you find no maintenance messages, then continue.

(2)  
Do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

(a)  
Do the fault isolation tasks for the maintenance messages that you find.

(b)  
If you find no maintenance messages, then continue.

(3)
Replace the left and right AOA Sensors.
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.

(a)  If the observed fault does not occur on the next flight leg, then you corrected the fault.
-------------------------END OF TASK ---------------------------
EFFECTIVITY

34-21 TASKS 829-830
SIL ALL
Page 265 D633A103-SIL Oct 15/2008

832.  ADIRS Maintenance Code 05 -Fault Isolation
A.  Description
(1)  
This task is for ADIRS maintenance code 05.

(2)  
ADIRS maintenance code 05, shows on the inertial system display unit (ISDU), indicates that the ISDU pin 10 does not receive 28 Vdc from the left ADIRU.

(3)  
There is no related ADIRS maintenance message that shows on the ADIRS BITE page on the CDU.

B.  Possible Causes
(1)  
Inertial system display unit (ISDU), P5-70

(2)
Wiring between the ISDU 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

D.  Related Data
(1)
(SSM 34-21-11)

(2)
(WDM 34-21-11)

E.  Initial Evaluation
(1)  
For
the
left
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

(2)  
If the maintenance code does not show on the ISDU, then there was an intermittent fault.

(3)  
If the maintenance code shows on the ISDU, then do the Fault Isolation Procedure below.

F. Fault Isolation Procedure
(1)
Replace the inertial system display unit (ISDU).
These are the tasks:
Inertial System Display Unit Removal, AMM TASK 34-21-02-000-801,
Inertial System Display Unit Installation, AMM TASK 34-21-02-400-801.

(a)  For
the
left
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
1) If the maintenance code does not show on the ISDU, then you corrected the fault. 2) If the maintenance code shows on the ISDU, then continue.

(2)  
Do this check of the wiring between the left ADIRU and the ISDU:

(a)  
Remove the left ADIRU. To remove it, do this task: Air Data Inertial Reference Unit Removal, AMM TASK 34-21-01-000-801.

(b)  
Remove the ISDU. To remove it, do this task: Inertial System Display Unit Removal, AMM TASK 34-21-02-000-801.

(c)  
Do this wiring check between connector D3687B for the left ADIRU and connector D2169 for the ISDU:

EFFECTIVITY SIL ALL  34-21 TASK 832 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 266 Oct 15/2008 

D3687B  D2169
pinD1 ------------------pin10

(d)  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 ISDU. To install it, do this task: Inertial System Display Unit Installation,
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：737-600/700/800/900 FAULT ISOLATION MANUAL 故障隔離手冊 導航(66)