(WARNING PRECEDES)
(1)
Make sure the air data inertial reference (ADIRU) system is operational.
NOTE: ADIRS alignment is required before you proceed with the repair confirmation.
(2)
Set the WXR switch on the captain’s and first officer’s EFIS control panels to ON.
(3)
Set the mode switch on the weather radar control panel to WXR.
(4)
Set the TILT mode switch on the weather radar control panel to AUTO.
(a)
Make sure ‘‘A’’ shows to the right of the tilt value on the captain’s and first officer’s NAV displays.
(b)
Make sure you do not see ’AUTOTILT FAIL’’ on the captain’s and first officer’s NAV displays.
(5)
Open this circuit breaker and install safety tag:
CAPT Electrical System Panel, P18-1
Row Col Number Name
B 7 C00629 GND PROX WARN
(6)
Make sure the amber AUTOTILT FAIL shows on the captain’s and first officer’s NAV displays.
(7)
Remove the safety tag and close this circuit breaker:
CAPT Electrical System Panel, P18-1
Row Col Number Name
B 7 C00629 GND PROX WARN
(8)
Make sure you do not see AUTOTILT FAIL on the captain’s and first officer’s NAV displays.
SIL ALL -------------------------END OF TASK ---------------------------
804. Weather Radar Control Panel Problem -Fault Isolation
A. Description
(1) The weather radar operational test shows a control panel fault.
B. Possible Causes
(1)
Weather radar control panel, P8-52.
(2)
Wiring.
C. Circuit Breakers
(1) These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-3
Row Col Number Name
SIL 014, 015, 020
C 7 C01678 WEATHER RADAR RT RIGHT
EFFECTIVITY SIL ALL 34-43 TASK 804
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 219 Feb 15/2011
F/O Electrical System Panel, P6-1
Row Col Number Name
SIL ALL
D 13 C00120 WEATHER RADAR RT
D. Related Data
(1)
(SSM 34-41-11).
(2)
(WDM 34-41-11).
E. Initial Evaluation
(1) 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.
(a)
If the weather radar operational test passes, then there was an intermittent fault.
(b)
If WXR FAIL CONT shows, then do the Fault Isolation Procedure below.
F. Fault Isolation Procedure
(1) Replace the weather radar control panel, P8-52.
These are the tasks:
*
Weather Radar Control Panel Removal, AMM TASK 34-43-91-000-801
*
Weather Radar Control Panel Installation, AMM TASK 34-43-91-400-801
(a) 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.
2) If WXR FAIL CONT shows, then continue.
(2) Do this check of the wiring between the weather radar control panel and the weather radar receiver/transmitter:
(a)
Remove the weather radar receiver/transmitter, M101. To remove it, do this task: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801.
(b)
Remove the weather radar control panel. To remove it, do this task: Weather Radar Control Panel Removal, AMM TASK 34-43-91-000-801.
(c)
Do a wiring check between the weather radar receiver/transmitter connector D189B and the weather radar control panel connector D193 (WDM 34-41-11).
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