818. Total ADIRU Failure -Fault Isolation
A. Description
(1)
This task is for this observed fault:

(a) Tilt Code of "-6" ADIRU.

(2)
No air data detected from the ADIRUs to the weather radar receiver/transmitter.

B. Possible Causes
(1)
ADIRU, M1749 (left) or M1752 (right).

(2)
Display electronics unit (DEU), M1808 (DEU 1) or M1809 (DEU-2).

(3)
Weather radar receiver/transmitter, M101.

SIL 014, 015, 020
(4) Left (Right) Weather radar receiver/transmitter, M101 (M460).
SIL ALL
C. Circuit Breakers
(1) These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-1
Row Col Number Name
E 7 C01007 ADIRU LEFT AC

CAPT Electrical System Panel, P18-2
Row Col Number Name
D 5 C01359 DISPLAY DEU 1 PRI

CAPT Electrical System Panel, P18-3
Row Col Number Name

SIL 014, 015, 020
C 7 C01678 WEATHER RADAR RT RIGHT
F/O Electrical System Panel, P6-1
Row Col Number Name

SIL ALL
C 14 C01008 ADIRU RIGHT AC D 9 C01362 DISPLAY DEU 2 HOLDUP D 10 C01361 DISPLAY DEU 1 HOLDUP D 11 C01360 DISPLAY DEU 2 PRI D 13 C00120 WEATHER RADAR RT
D. Related Data
(1)
(SSM 34-41-11), .

(2)
(WDM 34-41-11), .

E. Fault Isolation Procedure
(1) Replace the applicable ADIRU, M1749 (M1752).
These are the tasks:

EFFECTIVITY SIL ALL  34-43 TASK 818 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 257 Feb 15/2011 

(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 tilt code does not show then you corrected the fault.
2) If the tilt code shows, then continue.
(2) Replace the weather radar receiver/transmitter, M101. These are the tasks: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801, Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801.
(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 tilt code does not show then you corrected the fault.
SIL 014, 015, 020
(3) Replace the Left (Right) weather radar receiver/transmitter, M101 (M460). These are the tasks: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801, Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801.
(a)  Do this task: Weather Radar (WXR) System -Operational Test, AMM TASK 34-43-00-710-802-001.
1) If the tilt code does not show then you corrected the fault.
SIL ALL
-------------------------END OF TASK ---------------------------
819. No Input from the Air/Ground Relay -Fault Isolation
A. Description
(1)
This task is for this weather radar system observed fault:

(a)  Tilt Code of ‘‘-7’’ Air/Ground.

(2)
No data is detected from the air/ground relay by the weather radar receiver/transmitter.

B. Possible Causes
(1)
Air/ground relay, R589.

(2)
Wiring.

(3)
Weather radar receiver/transmitter, M101.

(4)
Left (Right) Weather radar receiver/transmitter, M101 (M460).

SIL 014, 015, 020
SIL ALL
EFFECTIVITY

34-43 TASKS 818-819
SIL ALL
Page 258 D633A103-SIL Feb 15/2011

C.  Circuit Breakers
(1)  These are the primary circuit breakers related to the fault:
CAPT Electrical System Panel, P18-3
Row Col Number Name