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

EFFECTIVITY

34-31 TASKS 814-815
SIL ALL
Page 222 D633A103-SIL Feb 15/2010

D. Related Data
(1)
(SSM 34-31-11).

(2)
(SSM 34-31-21).

(3)
(WDM 34-31-11).

(4)
(WDM 34-31-21).

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

(a)  
If the maintenance message shows, then do the Fault Isolation Procedure below.

(b)  
If the maintenance message does not show, 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’s) or P8-26 (first officer’s). 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.

2) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.
3) If the maintenance message does not show, then you corrected the fault.
(c)  If the navigation control panel does not display FAIL on the ACTIVE or STANDBY frequency indicators, then continue.
(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:

NAV MMR CONNECTOR CONNECTOR

CAPTAIN (P8-25) D303  D10719B
pin28 -------------------pinJ1 pin29 -------------------pinK1

FIRST OFFICER D305 D10721B (P8-26)
pin28 -------------------pinJ1 pin29 -------------------pinK1

(d)  If there is not continuity, then do these steps:
EFFECTIVITY SIL ALL  34-31 TASK 815 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 223 Feb 15/2010 

1) Repair the wiring. 2) Re-install the navigation control panel. To install it, do this task: Navigation Control Panel Installation, AMM TASK 34-31-52-400-801. 3) Re-install the MMR. To install it, do this task: Receiver for ILS -Installation, AMM
TASK 34-31-42-400-801. 4) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.
5) If the maintenance message does not show, then you corrected the fault.
-------------------------END OF TASK ---------------------------
816. ILS LOC Antenna Failed -Fault Isolation
A. Description
(1)
The task is for this maintenance message:

(a) LOC ANTENNA FAILED

(2)
The multi-mode receiver receives no input signal from the localizer (LOC) antenna, M1102.

B. Possible Causes
(1)
LOC antenna switch, R315 or R316.

(2)
Wiring problem.

(3)
LOC antenna, M1102.

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
　
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