(2)
IRS Mode Select Unit, P5–69.
(3)
IRS Master Caution Unit, M1206.
(4)
GPS antenna connection (M2102), D2947 or (M2103), D2941.
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)
(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
EFFECTIVITY
34-31 TASKS 822-823
SIL ALL
Page 239 D633A103-SIL Jun 15/2010
(a)
If the ILS, GLS and GPS lights come on, on the IRS Mode Select Unit, then do the Fault Isolation Procedure below.
(b)
If the ILS, GLS and GPS lights do not come on, on the IRS Mode Select unit, then there was an intermittent fault.
F. Fault Isolation Procedure
(1)
Replace the MMR, (M2104 and M2105).
These are the tasks:
AMM TASK 34-31-42-000-801
AMM TASK 34-31-42-400-801
(a)
If the ILS, GLS and GPS lights do not come on, on the IRS Mode Select Unit, then you corrected the fault.
(b)
If the ILS, GLS and GPS lights come on, on the IRS Mode Select Unit, then continue.
(2)
Do this check of the wiring:
(a)
Remove the MMR. To remove it, do this task: AMM TASK 34-31-42-000-801.
(b)
Do a MMR continuity check:
MMR A/C CONNECTOR REFERENCE D10719B DC Ground
pinD5 ------------------DCGround =<10Ohms pinD7 ------------------DCGround =<10Ohms pinH5 ------------------DCGround =<10Ohms pinJ5 -------------------DCGround =<10Ohms
MMR MMR CONNECTOR CONNECTOR D10719B D10719B
pinB5 ------------------pinK4 >100KOhms
MMR A/C CONNECTOR REFERENCE D10721B DC Ground
pinD5 ------------------DCGround =<10Ohms pinD7 ------------------DCGround =<10Ohms pinH5 ------------------DCGround =<10Ohms pinJ5 -------------------DCGround =<10Ohms
MMR MMR CONNECTOR CONNECTOR D10721B D10721B
pinB5 ------------------pinK4 >100KOhms
(c) If the result is not as expected, then do these steps: 1) Repair the wiring. 2) Re-install the MMR. To install it, do this task: AMM TASK 34-31-42-400-801. 3) If the ILS, GLS and GPS lights do not come on, on the IRS Mode Select Unit, then you
corrected the fault.
EFFECTIVITY SIL ALL 34-31 TASK 823
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 240 Jun 15/2010
4) If the ILS, GLS and GPS lights come on, on the IRS Mode Select Unit, then continue.
(3) If the ILS, GLS and GPS lights come on, on the IRS Model Select Unit, then do these tasks: ILS
Light
Stays
On
Continuously
-Fault
Isolation,
34-31
TASK
819
GLS
Light
Stays
On
Continuously
-Fault
Isolation,
34-31
TASK
821
GPS
Light
Stays
On
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