(a)  
Remove the Left (Right) weather radar receiver/transmitter, M101 (M460). To remove it, do this task: Weather Radar Receiver/Transmitter Removal, AMM TASK 34-43-41-000-801.

(b)  
Disconnect the weather radar antenna drive unit connector D119 (D2923).

(c)  
Do a wiring check between the Left (Right) weather radar receiver/transmitter connector D189B (673B), D189C (D673C) and the weather radar antenna drive unit connector D119 (D2923)(WDM 34-41-11).

D119 (D2923)  D189C (D673C)
pinI --------------------pin3 pinZ -------------------pin8
D119 (D2923)  D189B (D673C)
pinS -------------------pinC13 pinT -------------------pinC14 pinD -------------------pinC10 pinE -------------------pinC11 pinF -------------------pinC12 pinP -------------------pinE13 pinQ -------------------pinE14 pinA -------------------pinE10 pinB -------------------pinE11 pinC -------------------pinE12 pinHH ------------------pinD11

(d)  If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Re-install the Left (Right) weather radar receiver/transmitter, M101 (M460). To install it,
do this task: Weather Radar Receiver/Transmitter Installation, AMM TASK 34-43-41-400-801. 3) Re-connect the Left (Right) weather radar antenna drive unit connector D119 (D2923). 4) Do this task: Weather Radar (WXR) System -Operational Test, AMM TASK 34-43-00-710-802-001. a) If the weather radar operational test passes, then you corrected the fault.
-------------------------END OF TASK ---------------------------
SIL 001-003
828.  Weather Radar Automatic Tilt Fail Problems -Fault Isolation
A.  Possible Causes
(1)  
EGPWS Computer

(2)
Wiring

(3)  
WXR Transceiver

B.  Initial Evaluation
(1)  
Make sure the air data inertial reference unit (ADIRU) is operational. NOTE: ADIRS alignment is required before you proceed with the initial evaluation test.

(2)  
Make sure the captain’s and first officer’s EFIS displays are ON.

EFFECTIVITY

34-43 TASKS 803-828
SIL ALL
Page 216 D633A103-SIL Feb 15/2011

(3)  Do this task: GPWS
BITE
Procedure,
34-46
TASK
801, Self Test, Level 2, Current Faults, and Level 4, Fault History.
(a)  
If you hear the aural maintenance message ‘‘ARINC 429 Output Fault’’ in the EGPWS current faults or fault history, then replace the ground proximity warning computer, M652. To replace it, do these steps: Ground Proximity Warning Computer Removal, AMM TASK 34-46-01-000-801, Ground Proximity Warning Computer Installation, AMM TASK 34-46-01-400-801.

NOTE: ’’ARINC 429 Output Fault’’ is an EGPWS internal hardware failure reported by BIT that is relevant to the ‘‘Autotilt Fail’’ fault.

(b)  
If you do not hear the aural maintenance message ‘‘ARINC 429 Output Fault’’ in the EGPWS current faults or fault history, then do the Fault Isolation Procedure below.

C.  Fault Isolation Procedure
(1)  Do this check of the wiring between the weather radar receiver/transmitter and the ground proximity warning computer:
(a)  
Remove the ground proximity warning computer, M652. To remove it, do this task: Ground Proximity Warning Computer Removal, AMM TASK 34-46-01-000-801.

(b)  
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.

(c)  
Do a wiring check between the ground proximity warning computer connector D1153A and the weather radar receiver/transmitter connector D1898 (WDM 34-49-11).
　
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