(a)
Do a check of the condition of the pins and connector of the applicable ADIRU.
(b)
For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
1) If the maintenance message does not show on the CDU, and the status code does not show on the ISDU, then you corrected the fault.
2) If the maintenance message does show on the CDU, and the status code does show on the ISDU, then continue.
(2) Do this check of the wiring for the applicable ADIRU:
(a)
Remove the ADIRU. To remove it, do this task: Air Data Inertial Reference Unit Removal, AMM TASK 34-21-01-000-801.
(b)
For the left ADIRU, do a wiring check between these pins of connectors: 1) Do a wiring check between these pins of connectors D3687B and D3687A:
D3687B D3687A
pinK11 ----------------pinD6 pinK12 ----------------pinE6
(c) For the right ADIRU, do a wiring check between these pins of connectors: 1) Do a wiring check between these pins of connectors D3693B and D3693A:
D3693B D3693A
pinK11 ----------------pinD6 pinK12 ----------------pinE6
(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) For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.
4) If the maintenance message does not show on the CDU and the status code does not
show on the ISDU, then you corrected the fault.
-------------------------END OF TASK ---------------------------811. IR Program Pin Invalid -Fault Isolation
EFFECTIVITY SIL ALL 34-21 TASK 810
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 218 Oct 15/2008
A. Description
(1)
This task is for this maintenance message:
(a) 34-21019 IR PROG PIN INVLD
(2)
The maintenance message is identical for the left and right air data inertial reference systems (ADIRS). The left ADIRS maintenance message is shown on the ADIRS L BITE page on the control display unit (CDU). The right ADIRS maintenance message is shown on the ADIRS R BITE page on the CDU.
(3)
Selected display options and configurations are set by IR program pins. The status of these program pins are monitored by the ADIRU during power up.
(4)
This message shows when the ADIRU detects an invalid program pin configuration of the IR.
(5)
This fault causes the status code 19 to show on the inertial system display unit (ISDU) and the FAULT light on the mode select unit (MSU) to come on.
(6)
This is a critical fault which also causes the status code 02 to show on the ISDU.
B. Possible Causes
(1)
ADIRU, M1749 (left) or M1752 (right)
(2)
Wiring problem
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)
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