A5 SDI LSB A6 SDI MSB
(d) For the left ADIRU, do the check of these pins at connector D3687A. For the right ADIRU, do the check of these pins at connector D3693A:
Pin No. Signal
3C TAT recovery corr. program
7F Baro. select program #2 14F ADR program pin parity discrete 7G Baro. select program #3 8G Baro. select program #1 2H SSEC program
2J AOA correction program 5J Zero SSEC (AOA) program 1E A/C IDENT CODE 1/0 1F A/C IDENT CODE 2/0 1G A/C IDENT CODE 4/0 1H A/C IDENT CODE 8/0 1J A/C IDENT CODE 16/0 4A A/C IDENT CODE 32/0 4B A/C IDENT CODE 64/0 1K A/C IDENT CODE PARITY 7F BARO SELECT PROG #2 7G BARO SELECT PROG #3 8G BARO SELECT PRO #1 3D VMO/MMO DISCRETE INPUT #4 3E VMO/MMO DISCRETE INPUT #3 3F VMO/MMO DISCRETE INPUT #2 3G VMO/MMO DISCRETE INPUT #1 9F ALT #3 BARO ASSIGN #1 DISC IN
EFFECTIVITY SIL ALL 34-21 TASK 812
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 223 Oct 15/2008
Pin No. Signal
9G ALT #4 BARO ASSIGN #3 DISC IN 10F ALT #3 BARO ASSIGN #2 DISC IN 10G ALT #4 BARO ASSIGN #2 DISC IN 11G ALT #4 BARO ASSIGN #1 DISC IN
(e)
Make sure the program pins are connected correctly (WDM 34-21).
(f)
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 ---------------------------
813. TAT Probe Signal Fail -Fault Isolation
A. Description
(1)
This task is for this maintenance message:
(a) 34-21022 TAT PROBE SIGNAL FAIL
(2)
The maintenance message is the same 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)
The total air temperature (TAT) probe measures the outside air temperature. It changes the temperature value to an electrical signal and sends to the ADIRUs.
(4)
This message shows when the ADIRU receives an invalid signal from the total air temperature (TAT) probe.
(5)
This fault causes the status code 22 to show on the inertial system display unit (ISDU).
B. Possible Causes
(1)
TAT probe, M171
(2)
Wiring Problem
(3)
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 812-813
SIL ALL
Page 224 D633A103-SIL Oct 15/2008
CAPT Electrical System Panel, P18-2
Row Col Number Name
E 8 C00425 ADIRU LEFT EXC
CAPT Electrical System Panel, P18-3
Row Col Number Name
C 2 C00238 HEATERS TEMP PROBE
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 34-21-12)
(2)
(SSM 30-31-11)
(3)
(SSM 34-21-22)
(4)
(WDM 34-21-12)
(5)
(WDM 30-31-11)
