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

F. Fault Isolation Procedure
(1)  Put the airplane in the air mode. To put it in the air mode, do these tasks: Prepare to Put the Airplane in the Air Mode, AMM TASK 32-09-00-840-801 and Put the Airplane in the Air Mode, AMM TASK 32-09-00-860-801.
(a)
Do this task: Return the Airplane to the Ground Mode, AMM TASK 32-09-00-860-802.

(b)
Do
this
task:
Proximity
Switch
Electronics
Unit
(PSEU)
BITE
Procedure,
32-09
TASK
801.

EFFECTIVITY SIL ALL  34-21 TASK 824 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 246 Oct 15/2008 

1)  If the PSEU BITE shows an air/ground relay fault or a PSEU internal fault in EXISTING FAULTS, then go to the fault isolation task for the applicable PSEU maintenance message to correct the fault.
a)  For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

b)  If the ADIRS 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 PSEU BITE does not show an air/ground relay fault or a PSEU internal fault, then continue.
(2)
Replace the applicable ADIRU. These are the tasks: Air Data Inertial Reference Unit Removal, AMM TASK 34-21-01-000-801, Air Data Inertial Reference Unit Installation, AMM TASK 34-21-01-400-801.

(a)  
For
the
applicable
ADIRS,
do
this
task:
ADIRS
BITE
Procedure,
34-21
TASK
801.

(b)  
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.

(c)  
If the maintenance message shows on the CDU and the status code shows on the ISDU, then continue.

(3)  
Do this check of the wiring between the ADIRU and PSEU:

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

(b)  
Do the steps for Prepare for the Removal in this task: Proximity Switch Electronics Unit (PSEU) Removal, AMM TASK 32-09-10-000-801.

(c)  
For the left ADIRU, do this wiring check: 1) Disconnect connector D11138 from the PSEU. 2) Do a wiring check between these pins of connector D11138 and connector D3687B for

the left ADIRU:
D11138  D3687B
pin53 ------------------pinK15

(d)  For the right ADIRU, do this wiring check: 1) Disconnect connector D11140 from the PSEU. 2) Do a wiring check between these pins of connector D11140 and connector D3693B for
the right ADIRU:
D11140  D3693B
pin53 ------------------pinK15

(e)  If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Re-connect connector to the PSEU. 3) Put the airplane systems back to normal on ground condition. To put it back to normal,
do this task: Return the Airplane to the Ground Mode, AMM TASK 32-09-00-860-802.
EFFECTIVITY SIL ALL  34-21 TASK 824 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 247 Oct 15/2008 

4)  Remove the safety tags and close these circuit breakers:
F/O Electrical System Panel, P6-3 Row Col Number Name B 17 C00129 LANDING GEAR LATCH & PRESS WARN C 15 C01355 LANDING GEAR AIR/GND SYS 2 C 16 C01356 LANDING GEAR AIR/GND SYS 1 D 1 C01399 PSEU PRI D 2 C01400 PSEU ALTN
　
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