(b)
If the maintenance message shows, then do the Fault Isolation Procedure below.
F. Fault Isolation Procedure
(1) Do this check of the weather radar receiver/transmitter cooling system:
(a)
Select WXR ON on the EFIS control panel.
(b)
If the fan comes on, then do these steps: 1) Remove the weather radar receiver/transmitter. To remove it, do this task: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801.
2) Look for any objects or dust that can stop the weather radar receiver/transmitter air flow. a) Remove the unwanted objects that stop the air flow.
SIL 001-003
b) Clean the air filter. To clean the filter, do this task: Weather Radar R/T Mount Filter Cleaning, AMM TASK 34-43-09-100-801
SIL ALL
EFFECTIVITY SIL ALL 34-43 TASK 805
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 222 Feb 15/2011
(c) If the fan does not come on, then replace the weather radar receiver/transmitter mount, M1209.
These are the tasks:
*
Weather Radar Receiver/Transmitter Mount Removal, AMM TASK 34-43-31-000-801
*
Weather Radar Receiver/Transmitter Mount Installation, AMM TASK 34-43-31-400-801
(d) Do this task: Weather Radar (WXR) System -Operational Test, AMM TASK 34-43-00-710-802-001 or Weather Radar (WXR) System -Operational Test, AMM TASK 34-43-00-710-803-002
1) If the weather radar operational test passes, then you corrected the fault.
SIL 014, 015, 020
(2) Do this check of the Left (Right) weather radar receiver/transmitter cooling systems:
(a)
Select WXR ON on the EFIS control panels.
(b)
If the fans come on, then do these steps: 1) Remove the Left (Right) weather radar receiver/transmitter. To remove it, do this task: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801.
2) Look for any objects or dust that can stop the Left (Right) weather radar receiver/ transmitter air flows. a) Remove the unwanted objects that stop the air flows.
3) Re-install the Left (Right) weather radar receiver/transmitter. To install it, do this task: Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801.
(c) If the fan does not come on, then replace the Left (Right) weather radar receiver/transmitter mount, M103 (M2673).
These are the tasks:
*
Weather Radar Receiver/Transmitter Mount Removal, AMM TASK 34-43-31-000-801
*
Weather Radar Receiver/Transmitter Mount Installation, AMM TASK 34-43-31-400-801
(d) Do this task: Weather Radar (WXR) System -Operational Test, AMM TASK 34-43-00-710-802-001
1) If the weather radar operational test passes, then you corrected the fault.
SIL ALL -------------------------END OF TASK ---------------------------
806. Weather Radar System, Inertial Reference System Problem -Fault Isolation
A. Description
(1) This task is for these observed faults:
(a)
Tilt Code ‘‘-1’’ Attitude -Left.
(b)
Tilt Code ‘‘+1’’ Attitude -Right.
(c)
Tilt Code ‘‘-3’’ Air Data -Left.
(d)
Tilt Code ‘‘+3’’ Air Data -Right.
EFFECTIVITY
34-43 TASKS 805-806
SIL ALL
Page 223 D633A103-SIL Feb 15/2011
(2) The weather radar has found a problem with the data sent from the inertial reference system portion of the ADIRU.
B. Possible Causes
(1)
Air data inertial reference unit (ADIRU), M1749 (left ADIRU) or M1752 (right ADIRU).
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