Installation, AMM TASK 31-62-21-400-801. 3) If the flags do not show on the F/O’s display, then you corrected the fault.
(e)
If there is continuity between pin G10 and structure ground, then continue.
SIL ALL; AIRPLANES WITH MULTI-MODE RECEIVERS (MMR)
(3) Do this check of the wiring between the DEU and the MMR:
(a)
Remove the DEU, M1809. To remove it, do this task: Display Electronic Unit Removal, AMM TASK 31-62-21-000-801.
(b)
Remove the MMR-2, M2105. To remove it, do this task: Receiver for ILS -Removal, AMM TASK 34-31-42-000-801.
(c)
Do a check for an open circuit between the pins specified for the applicable fault flag:
DEU MMR
CONNECTOR CONNECTOR
LOC FLAG D3975D D10721B
pin C15 ----------------- pin G1
pin D15 ----------------- pin H1
G/S FLAG D3975B D10721B
pin G3 ------------------ pin G1
pin H3 ------------------ pin H1
(d) If there is an open circuit, then do these steps:
1) Repair the wiring.
2) Re-install MMR-2, M2105. To install it, do this task: Receiver for ILS -Installation, AMM TASK 34-31-42-400-801.
3) Re-install the DEU, M1809. To install it, do this task: Display Electronic Unit Installation, AMM TASK 31-62-21-400-801.
4) If the flags do not show on the F/O’s display, then you corrected the fault.
(e) If there is continuity between the pins, then continue.
1) Re-install the MMR-2, M2105. To install it, do this task: Receiver for ILS -Installation, AMM TASK 34-31-42-400-801.
2) Re-install the DEU, M1809. To install it, do this task: Display Electronic Unit Installation, AMM TASK 31-62-21-400-801.
SIL ALL
EFFECTIVITY SIL ALL 34-31 TASK 807
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 209 Oct 10/2006
(4) Do this check of the display electronic unit (DEU):
(a)
Do
this
task:
DEU
Self-Test
Procedure,
31-62
TASK
802.
(b)
If the DEU shows FAILED, then do these steps:
1) Replace the DEU, M1809. These are the tasks: Display Electronic Unit Removal, AMM TASK 31-62-21-000-801, Display Electronic Unit Installation, AMM TASK 31-62-21-400-801.
-------------------------END OF TASK ---------------------------
808. Navigation Control Panel Problem -Fault Isolation
A. Description
(1) The Navigation Control Panel shows a failure.
B. Possible Causes
(1) Navigation control panel, P8-25 (Captain) or P8-26 (F/O).
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)
(WDM 34-31-11).
(2)
(SSM 34-31-11).
E. Initial Evaluation
(1) Do this check of the NAV control panel:
(a)
If the NAV control panel does display FAIL on the ACTIVE or STANDBY frequency indicators, then do the Fault Isolation Procedure below.
(b)
If the NAV control panel does not display FAIL on the ACTIVE or STANDBY frequency indicators, then it was an intermittent fault.
F. Fault Isolation Procedure
(1) Do check of the wiring of the INSTR SWITCHING module:
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