(c)  
If
WXR
FAIL
CONT
shows,
then
do
this
task:
Weather
Radar
Control
Panel
Problem
-
Fault Isolation, 34-43 TASK 804.

(d)  
If
WXR
FAIL
ATT
shows,
then
do
this
task:
Weather
Radar
System,
Inertial
Reference
System Problem -Fault Isolation, 34-43 TASK 806.

(e)  
If
WXR
FAIL
WEAK
shows,
then
do
this
task:
Weather
Radar
Cooling
Problem
-Fault
Isolation, 34-43 TASK 805.

(f)  
If
WXR
FAIL
shows,
then
do
this
task:
Weather
Radar
System
BITE
Procedure,
34-43 TASK 801.

EFFECTIVITY SIL ALL  34-43 TASK 814 
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details  Page 247 Feb 15/2011 

SIL 001-003
(g)  If
AUTOTILT
FAIL
shows,
then
do
this
task:
Weather
Radar
Automatic
Tilt
Fail
Problems
-Fault Isolation, 34-43 TASK 828.
SIL ALL
-------------------------END OF TASK ---------------------------
815.  Predictive Windshear System Problem -Fault Isolation
A.  Description
(1)  This task is for this fault:
(a)  PWS FAIL
B.  Possible Causes
(1)  
Weather radar antenna drive, M1209.

(2)  
Weather radar receiver/transmitter, M101.

SIL 014, 015, 020
(3)  Left (Right) Weather radar receiver/transmitter, M101 (M460).
SIL ALL
(4)
ADIRU, M1749 (left) or M1752 (right).

(5)  
Low range radio altimeter (LRRA), M1735 (left LRRA) or M1736 (right LRRA).

(6)  
Autothrottle microswitch assembly, M1766 (left) or M1767 (right).

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
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.
EFFECTIVITY

34-43 TASKS 814-815
SIL ALL
Page 248 D633A103-SIL Feb 15/2011

(b)  If the weather radar operational test does not pass, then do the Fault Isolation Procedure below.
F.  Fault Isolation Procedure
(1)  Do this check of the weather radar receiver/transmitter blower assembly.
(a)  
To get access to the weather radar R/T mount, open this access panel:

Number Name/Location
112A Forward Access Door

(b)  
Push the blower assembly test switch on the R/T mount.

(c)  
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.
　
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