(2)
ADIRS maintenance code 06, shows on the inertial system display unit (ISDU), indicates that the ISDU pin 10 does not receive 28 Vdc from the right 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 right ADIRU
C. Circuit Breakers
(1) These are the primary circuit breakers related to the fault:
F/O Electrical System Panel, P6-1
Row Col Number Name
C 14 C01008 ADIRU RIGHT AC
C 17 C01010 ADIRU RIGHT DC
D. Related Data
(1)
(SSM 34-21-21)
(2)
(WDM 34-21-21)
E. Initial Evaluation
(1)
For
the
right
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:
EFFECTIVITY
34-21 TASKS 832-833
SIL ALL
Page 267 D633A103-SIL Oct 15/2008
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
right
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 right ADIRU and the ISDU:
(a)
Remove the right 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 D3693B for the right ADIRU and connector D2183 for the ISDU:
D3693B D2183
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,
AMM TASK 34-21-02-400-801. 4) For
the
right
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
5) If the maintenance code does not show on the ISDU, then you corrected the fault.
-------------------------END OF TASK ---------------------------
835. Maintenance Code Shows on ISDU -Fault Isolation
A. Description
(1) This task is for this observed fault:
(a) A maintenance code shows on the ISDU.
B. Possible Causes
(1) One or more ADIRS faults.
NOTE: The fault monitor that causes the status code also causes a maintenance message.
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