G. Repair Confirmation
(1)
Do
the
applicable
ADIRS
BITE
procedure
(ADIRS
BITE
Procedure,
34-21
TASK
801)

(2)
If the maintenance code does not show on the ISDU, then you corrected the fault.

-------------------------END OF TASK ---------------------------
836. VERIFY POSITION shows on the CDU, and POS SHIFT page shows large ADIRU drift -Fault Isolation
A. Description
(1) This task is for this observed fault:
(a)  VERIFY POSITION shows on the CDU and the POS SHIFT page shows a large position differences between the ADIRU and the FMC.
B. Possible Causes
(1)
ADIRU, M1749 (left) or M1752 (right)

(2)
Flight management computer (FMC), M1175 (left) or M1632 (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 835-836
SIL ALL
Page 270 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 34-21-11).

(2)
(WDM 34-21-11).

E.  Initial Evaluation
(1)  The flight crew observed that VERIFY POSITION showed on the CDU and the POS SHIFT page showed a large position differences between the ADIRU and the FMC.
F. Fault Isolation Procedure
(1)  
Do these tasks:

(a)  
IR Radial Position Error Check, AMM TASK 34-21-00-200-801

(b)  
Inertial Reference Residual Groundspeed Error Check, AMM TASK 34-21-00-200-802

(2)  
If the ADIRS is not in tolerance for the two checks, follow the instruction in the task to fix the problem.

(3)  
If the ADIRS is in tolerance for the two checks, then continue.

(4)  
Do
this
task:Flight
Management
Computer
System
BITE
Procedure,
34-61
TASK
801

(a)  
Do the fault isolation tasks for the maintenance messages that you find.

(b)  
If you find no maintenance messages, monitor the applicable after the subsequent flight leg.

(5)  
Do the repair confirmation below.

G.  Repair Confirmation
(1)  
Do these tasks:

(a)  
IR Radial Position Error Check, AMM TASK 34-21-00-200-801

(b)  
Inertial Reference Residual Groundspeed Error Check, AMM TASK 34-21-00-200-802

(c)  
Flight
Management
Computer
System
BITE
Procedure,
34-61
TASK
801

(2)  
Check and make sure the IR radial position and inertial reference residual groundspeed is satisfactory and there are no maintenance messages found.

-------------------------END OF TASK ---------------------------
839. ADR Failure -Fault Isolation
A.  Description
(1)  This task is for this maintenance message:
(a)  34-21020 ADR FAIL
EFFECTIVITY

34-21 TASKS 836-839
　
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