A. Description
(1)
This task is for these weather radar system observed faults:
(a)
Tilt Code "-2" Radio Altitude -Left.
(b)
Tilt Code "+2" Radio Altitude -Right.
(2)
The weather radar has found a problem with the data sent from the radio altimeters.
B. Possible Causes
(1)
Low range radio altimeter (LRRA), M1735 (left LRRA) or M1736 (right LRRA).
(2)
Wiring.
(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 B 4 C01384 RADIO NAVIGATION RADIO ALTM 1
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
A 16 C01385 RADIO NAVIGATION RADIO ALTM 2 D 13 C00120 WEATHER RADAR RT
D. Related Data
(1)
(SSM 34-41-11).
(2)
(WDM 34-41-11).
(3)
(WDM 34-33-11).
(4)
(WDM 34-33-21).
E. Initial Evaluation
(1)
Do the right or left (LRRA) depend on the titl code.
(2)
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.
EFFECTIVITY SIL ALL 34-43 TASK 807
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 229 Feb 15/2011
(a)
If the tilt code does not show then there was an intermittent fault.
(b)
If the tilt code shows then do the Fault Isolation Procedure below.
F. Fault Isolation Procedure
(1) Replace the left LRRA, applicable to tilt code ‘‘-2’’. To replace it,
These are the tasks:
*
Low Range Radio Altimeter (LRRA) Receiver/Transmitter (R/T) Removal, AMM TASK 34-33-21-000-801
*
Low Range Radio Altimeter (LRRA) Receiver/Transmitter (R/T) Installation, AMM TASK 34-33-21-400-801
(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.
2) If the tilt code shows then continue.
(2) Replace the right LRRA, applicable to tilt code ‘‘+2’’. To replace it,
These are the tasks:
*
Low Range Radio Altimeter (LRRA) Receiver/Transmitter (R/T) Removal, AMM TASK 34-33-21-000-801
*
Low Range Radio Altimeter (LRRA) Receiver/Transmitter (R/T) Installation, AMM TASK 34-33-21-400-801
(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.
2) If the tilt code shows then continue.
(3) Do this check of the wiring between the left LRRA and the weather radar receiver/transmitter, applicable to tilt code ‘‘-2’’:
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