(b)  
If the audio tone is normal, then there was an intermittent fault.

F. Fault Isolation Procedure
SIL 001-003; AIRPLANES WITH BENDIX (ALLIED SIGNAL) MULTI-MODE RECEIVERS
(1)  Do this check of the MMR:
(a)  
Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.

(b)  
If the LCD display on the multi-mode receiver shows MMR TEST COMPLETE FAILURES, then follow the BITE procedure and go to the task for the applicable maintenance message.

(c)  
If the LCD display on the multi-mode receiver shows MMR TEST COMPLETE NO FAILURES, then continue.

SIL 004-021, 101-999; AIRPLANES WITH COLLINS MULTI-MODE RECEIVERS
(2)  
Do this check of the MMR:

(3)  
Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801.

EFFECTIVITY SIL ALL  34-31 TASK 811 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 217 Jun 15/2010 

(a)  
If the red LRU STATUS light comes on after approximately 15 seconds, then follow the BITE procedure and go to the task for the applicable maintenance message.

(b)  
If the green LRU STATUS light comes on after approximately 15 seconds, then continue.

SIL ALL
(4)
Replace the remote electronics unit, M1353. These are the tasks: Remote Electronics Unit (REU) Removal, AMM TASK 23-51-01-000-801, Remote Electronics Unit (REU) Installation, AMM TASK 23-51-01-000-802.

(a)  
Do this task: Instrument Landing System -System Test, AMM TASK 34-31-00-730-801.

(b)  
If the audio tone is normal, then you corrected the fault.

(5)
Do this check of the wiring:

(a)  
Remove the remote electronics unit. To remove it, do this task: Remote Electronics Unit (REU) Removal, AMM TASK 23-51-01-000-801.

(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 these pins of connector D10719B for the MMR and connector D2501A for the remote electronics unit:

D10719B  D2501A
pinJ10 ------------------pinE12 pinK10 -----------------pinE11
D10721B  D2501A
pinJ10 ------------------pinH9 pinK10 -----------------pinG9

(d)  
If there is not continuity, then do these steps: 1) Repair the wiring. 2) Re-install the remote electronics unit. To install it, do this task: Remote Electronics

Unit (REU) Installation, AMM TASK 23-51-01-000-802. 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: Instrument Landing System -System Test, AMM TASK 34-31-00-730-801. 5) If the audio tone is normal, then you corrected the fault.

(e)  
If there is continuity, then continue.

1)  Re-install the MMR. To install it, do this task: Receiver for ILS -Installation, AMM TASK 34-31-42-400-801.
(f)  Do a Nose Radome InspectionAMM TASK 53-52-00-200-801.
-------------------------END OF TASK ---------------------------812. ILS or Multi-Mode Receiver Failed -Fault Isolation
EFFECTIVITY SIL ALL  34-31 TASK 811 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 218 Jun 15/2010 

A. Description
(1)
The task is for this maintenance message:

(a)  LRU STATUS
　
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