(3)
Each ADIRU supplies inertial reference (IR) data to many systems and components. IR data is on ARINC 429 data buses. The data on each IR bus is the same. One data bus goes from the IR section of the ADIRU to the ADR section.
(4)
The message 34-21037 shows when the ADR receives invalid data from the IR section of the ADIRU. The IR fault also causes the status code 37 to show on the inertial system display unit (ISDU).
B. Possible Causes
(1) 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
EFFECTIVITY
34-21 TASKS 805-806
SIL ALL
Page 211 D633A103-SIL Oct 15/2008
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
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
(2)
If other maintenance messages show on the CDU along with the maintenance message 34-2103, then do the corrective tasks to remove those maintenance messages first.
(a)
After you clear the correlated faults, if the maintenance message 34-21037 does not show on the CDU, and the status code 37 does not show on the ISDU, then you corrected the fault.
(b)
After you clear the correlated faults, if the maintenance message 34-21037 continues to show on the CDU, and the status code 37 shows on the ISDU, then do the Fault Isolation Procedure below.
F. Fault Isolation Procedure
(1) Do this check of the wiring between the applicable ADIRU and the ADM:
(a)
Remove the ADIRU. To remove it, do this task: Air Data Inertial Reference Unit Removal, AMM TASK 34-21-01-000-801.
(b)
Remove the ADMs. To remove them, do these tasks:
Pitot Air Data Module Removal, AMM TASK 34-21-04-000-801,
Static Air Data Module Removal, AMM TASK 34-21-04-000-802.
(c)
For the left ADIRU, do a wiring check between these pins of connector D3687A for the ADIRU and connector D3689 for the pitot ADM and D3691 for the static ADM:
D3687A D3689
D10 --------------------7
E10 --------------------8
D3687A D3691
D9 ---------------------7
E9 ---------------------8
(d) For the right ADIRU, do a wiring check between these pins of connector D3693A for the ADIRU and connector D3695 for the pitot ADM and D3697 for the static ADM:
D3687A D3689
D10 --------------------7
E10 --------------------8
EFFECTIVITY SIL ALL 34-21 TASK 806
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 212 Oct 15/2008
D3687A D3691
D9 ---------------------7
E9 ---------------------8
(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 ADMs. To install them, do these tasks: Pitot Air Data Module Installation, AMM TASK 34-21-04-400-801, Static Air Data Module Installation, AMM TASK 34-21-04-400-802.
4) For
the
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