(b)  
Do a check of the grounding block for 0 volt (GND).

(c)  
For the captain’s NAV control panel, P8-25, do the check of connector D553 at pin 28 and pin

29.

(d)  
For the first officer’s NAV control panel, P8-26, do the check of connector D1817 at pin 14 and pin 15.

EFFECTIVITY

34-31 TASKS 807-808
SIL ALL
Page 210 D633A103-SIL Feb 15/2010

(e)  
If the NAV control panel does not display FAIL on the ACTIVE or STANDBY frequency indicators, then you corrected the fault.

(f)  
Re-install the P5 panel.

(2)  
If the NAV control panel displays FAIL on the ACTIVE or STANDBY frequency indicators, then continue.

(3)
Replace the NAV control panel, P8-25 (Captain) or P8-26 (F/O) as applicable. These are the tasks: Navigation Control Panel Removal, AMM TASK 34-31-52-000-801, Navigation Control Panel Installation, AMM TASK 34-31-52-400-801.

(a)  If the NAV control panel does not display FAIL on the ACTIVE or STANDBY frequency indicators, then you corrected the fault.
-------------------------END OF TASK ---------------------------
809. No Pointers and No Flags -Fault Isolation
A.  Description
(1)  The ILS data goes to a no computed data (NCD) condition.
B.  Possible Causes
(1)
MMR-1, M2104 or MMR-2, M2105.

(2)
Navigation control panel, P8-25 (Captain) or P8-26 (F/O).

(3)  
ILS antenna, M40 (G/S) or M1102 (LOC).

(4)
Wiring.

C.  Circuit Breakers
(1)  These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-1
Row Col Number Name
A 2 C01479 RADIO NAVIGATION MMR 1

F/O Electrical System Panel, P6-1
Row Col Number Name
A 13 C01480 RADIO NAVIGATION MMR 2

D.  Related Data
(1)
(SSM 31-62-15).

(2)
(SSM 34-31-11).

(3)
(WDM 31-62-15).

(4)
(WDM 34-31-11).

E.  Initial Evaluation
(1)  Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.

(a)  If the localizer and glideslope pointers do not show on the captain’s or F/O’s displays, then do the Fault Isolation Procedure below.
EFFECTIVITY

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(b)  If the localizer and glideslope pointers show on the captain’s or F/O’s displays, then there was an intermittent fault.
F.  Fault Isolation Procedure
(1)  Do this check of the navigation control panel:
(a)  
Make sure that the navigation control panel does not display FAIL on the ACTIVE or STANDBY frequency indicators.

(b)  
If the navigation control panel display FAIL on the ACTIVE or STANDBY frequency indicators, then do these steps: 1) Replace the navigation control panel, P8-25 (Captain) or P8-26 (F/O). These are the tasks:

Navigation Control Panel Removal, AMM TASK 34-31-52-000-801, Navigation Control Panel Installation, AMM TASK 34-31-52-400-801.

(c)  
If the navigation control panel does not display FAIL on the ACTIVE or STANDBY frequency indicators, then continue.

SIL ALL; AIRPLANES WITH MULTI-MODE RECEIVERS (MMR)
(2)  Do this check of the wiring:
(a)  
Remove the navigation control panel. To remove it, do this task: Navigation Control Panel Removal, AMM TASK 34-31-52-000-801.

(b)  
Remove the MMR. To remove it, do this task: Receiver for ILS -Removal, AMM TASK 34-31-42-000-801.

(c)  
Do a continuity check between the MMR and the applicable navigation control panel:
　
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