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807. WAIT ATT Flag on the Integrated Standby Flight Display -Fault Isolation
A.  Description
(1)  The WAIT ATT message shows when there is a temporary loss of attitude function. The attitude function will automatically come back. No maintenance action is necessary.
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808. G/S or LOC Flag on the Integrated Standby Flight Display -Fault Isolation
A.  Description
(1) The G/S or the LOC flag shows when there is a loss of glide slope or localizer functions.
B.  Possible Causes
(1)  
Instrument Landing System.

(2)
Integrated Standby Flight Display.

C.  Related Data
(1)
(SSM 34-24-15).

(2)
(WDM 34-24-15).

D.  Initial Evaluation
(1)  Make sure that these circuit breakers are closed:
CAPT Electrical System Panel, P18-1
Row Col Number Name
A 2 C01479 RADIO NAVIGATION MMR 1

CAPT Electrical System Panel, P18-2
Row Col Number Name
D 8 C01551 ISFD

(2)  
If the G/S or LOC flag does not show on the integrated standby flight display, then there was an intermittent fault.

(3)  
If the G/S or LOC flag shows on the integrated standby flight display, then do the Fault Isolation Procedure below.

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

(a)  
Repair the problems that you find.

(b)  
If the G/S or LOC flag does not show on the integrated standby flight display and the attitude is displayed, then you have corrected the fault.

EFFECTIVITY

34-24 TASKS 806-808
SIL ALL
Page 205 D633A103-SIL Jun 15/2008

(c)  If the G/S or LOC flag shows on the integrated standby flight display, then continue.
(2)
Replace the integrated standby flight display, N226. These are the tasks: Integrated Standby Flight Display Removal, AMM TASK 34-24-02-000-801, Integrated Standby Flight Display Installation, AMM TASK 34-24-02-400-801.

(a)  
If the G/S or LOC flag does not show on the integrated standby flight display and the attitude is displayed, then you have corrected the fault.

(b)  
If the G/S or LOC flag shows on the integrated standby flight display, then continue.

 

(3)  
Do this check of wiring between the integrated standby flight display and the multi-mode receiver.

(a)  
Remove the multi-mode receiver, M2104. To remove it, do this task: Receiver for ILS -Removal, AMM TASK 34-31-42-000-801.

(b)  
Remove the integrated standby flight display, N226. To remove it, do this task: Integrated Standby Flight Display Removal, AMM TASK 34-24-02-000-801.

(c)  
Do a wiring check between these pins of connector D10719B for the MMR and connector D10853 for the integrated standby flight display (WDM 34-24-15):

 

D10719B  D10853
pinG1 ------------------pinA pinH1 ------------------pinW

(d)  
Repair the problems that you find.

(e)  
Re-install the multi-mode receiver, M2104. To install it, do this task: Receiver for ILS -Installation, AMM TASK 34-31-42-400-801.

(f)  
Re-install the integrated standby flight display, N226. To install it, do this task: Integrated Standby Flight Display Installation, AMM TASK 34-24-02-400-801.

(g)  
Remove the safety tags and close these circuit breakers:

CAPT Electrical System Panel, P18-1 Row Col Number Name A 2 C01479 RADIO NAVIGATION MMR 1
CAPT Electrical System Panel, P18-2
　
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