(2)
IRS Mode Select Unit, P5–69.
(3)
IRS Master Caution Unit, M1206.
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
EFFECTIVITY
34-31 TASKS 818-819
SIL ALL
Page 229 D633A103-SIL Jun 15/2010
F/O Electrical System Panel, P6-1
Row Col Number Name
A 13 C01480 RADIO NAVIGATION MMR 2
D. Related Data
(1)
(SSM 34-58-11).
(2)
(SSM 34-58-21).
(3)
(WDM 34-31-11).
(4)
(WDM 34-31-21).
(5)
(WDM 34-58-11).
(6)
(WDM 34-58-21).
E. Initial Evaluation
(1) Do
this
task:
ILS
or
Multi-Mode
Receiver
BITE
Procedure,
34-31
TASK
801
(a)
If the ILS light shows on the IRS Mode Select Unit, then do the Fault Isolation Procedure below.
(b)
If the ILS light does not show on the IRS Mode Select Unit, then there was an intermittent fault.
F. Fault Isolation Procedure
(1)
If LOC and G/S Flags are shown on both the Captain’s and F/O’s Displays, then do these tasks: LOC
And
G/S
Flags
Show
On
The
Captain’s
Display
-Fault
Isolation,
34-31
TASK
806
and
LOC
And
G/S
Flags
Show
On
The
F/O’s
Display
-Fault
Isolation,
34-31
TASK
807.
(a)
If the ILS light does not show on the IRS Mode Select Unit and both LOC and G/S Flags does not shown on the Captain’s and F/O’s Displays, then your corrected the fault.
(b)
If the ILS light shows on the IRS Mode Select Unit, then continue.
(2)
Replace the IRS Mode Select Unit, P5-69
These are the tasks:
AMM TASK 34-21-03-000-801,
AMM TASK 34-21-03-400-801.
(a)
If the ILS light does not show on the IRS Mode Select Unit, then you corrected the fault.
(b)
If the ILS light shows on the IRS Mode Select Unit, then continue.
(3)
Replace the IRS Master Caution Unit, M1206, on the P61 sidewall panel.
These are the tasks:
AMM TASK 34-21-07-000-801,
AMM TASK 34-21-07-400-801.
(a)
If the ILS light does not show on the IRS Mode Select Unit, then you corrected the fault.
(b)
If the ILS light shows on the IRS Mode Select Unit, then continue.
(4)
Do this check of the wiring:
(a)
Remove the IRS Mode Select Unit. To remove it, do this task: AMM TASK 34-21-03-000-801.
(b)
Remove the MMR. To remove it, do this task: AMM TASK 34-31-42-000-801.
(c)
Remove the IRS MCU. To remove it, do this task: AMM TASK 34-21-07-000-801.
(d)
Do a continuity check between the MMR and the IRS MCU:
EFFECTIVITY SIL ALL 34-31 TASK 819
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 230 Jun 15/2010
IRS MCU MMR CONNECTOR CONNECTOR D2269 D10719B
pin7 -------------------pinG1 pin10 -------------------pinH1
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