(b)
If the DEU shows FAILED, then do these steps: 1) Replace the DEU, M1808.
EFFECTIVITY SIL ALL 34-31 TASK 806
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 207 Oct 10/2006
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 ---------------------------
807. LOC And G/S Flags Show On The F/O’s Display -Fault Isolation
A. Description
(1) The localizer (LOC) and glideslope (G/S) receiver functions have a failure.
B. Possible Causes
(1)
MMR-2, M2105.
(2)
VHF NAV switch S2, P5-28.
(3)
Wiring problem.
(4)
Display electronic unit (DEU), M1809.
C. Circuit Breakers
(1) This is the primary circuit breaker related to the fault:
F/O Electrical System Panel, P6-1
Row Col Number Name
A 13 C01480 RADIO NAVIGATION MMR 2
D. Related Data
(1)
(SSM 34-31-21).
(2)
(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 flags show on the F/O’s display, then do the Fault Isolation below.
(b)
If the flags do not show on the F/O’s display, then there was an intermittent fault.
F. Fault Isolation Procedure
(1) Do this task: Instrument Landing System -Operational Test, AMM TASK 34-31-00-710-801.
(a)
If the flags show on the captain’s and F/O’s displays while the VHF NAV switch is in the BOTH ON 2 position, then do these steps: 1) Replace the MMR-2, M2105. These are the tasks: Receiver for ILS -Removal, AMM TASK 34-31-42-000-801, Receiver for ILS -Installation, AMM TASK 34-31-42-400-801.
2) If the flags do not show on the captain’s and F/O’s displays, then you corrected the fault.
(b)
If the flags show just on the captain’s or F/O’s displays, then do these steps: 1) Replace the VHF NAV switch S2, P5-28. 2) If the flags do not show on the captain’s and F/O’s displays, then you corrected the
fault.
EFFECTIVITY
34-31 TASKS 806-807
SIL ALL
Page 208 D633A103-SIL Oct 10/2006
3) If the flags show on the captain’s or F/O’s displays, then continue.
(c) If the flags only show on the F/O’s display while the VHF NAV switch is in the BOTH ON 2 position, then continue.
(2) Do this check of the wiring between the VHF NAV switch and the DEU, M1809:
(a)
Set the VHF NAV switch to the BOTH ON 2 position.
(b)
Remove the DEU, M1809. To remove it, do this task: Display Electronic Unit Removal, AMM TASK 31-62-21-000-801.
(c)
Do a continuity check between pin G10 of the connector D3975B and structure ground.
(d) 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：737-600/700/800/900 FAULT ISOLATION MANUAL 故障隔離手冊 導航(94)
