EFFECTIVITY SIL ALL 34-33 TASK 801
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Low Range Radio Altimeter (LRRA) Receiver/Transmitter
Figure 201 (Sheet 1 of 3)/ 34-33-00-990-802
EFFECTIVITY SIL ALL 34-33 TASK 801
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Low Range Radio Altimeter (LRRA) Receiver/Transmitter
Figure 201 (Sheet 2 of 3)/ 34-33-00-990-802
EFFECTIVITY SIL 004-021, 101-999 34-33 TASK 801
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Low Range Radio Altimeter (LRRA) Receiver/Transmitter
Figure 201 (Sheet 3 of 3)/ 34-33-00-990-802
EFFECTIVITY SIL 001-003 34-33 TASK 801
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802. Radio Altimeter Receiver/Transmitter Failed -Fault Isolation
A. Description
(1)
The task is for this maintenance message:
(a) RADIO ALTIMETER FAILED
(2)
The radio altimeter receiver/transmitter has an internal failure.
B. Possible Causes
(1) LRRA receiver/transmitter, M1735 (No. 1) or M1736 (No. 2).
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
F/O Electrical System Panel, P6-1 Row Col Number Name A 16 C01385 RADIO NAVIGATION RADIO ALTM 2
D. Related Data
(1)
(SSM 34-33-11).
(2)
(SSM 34-33-21).
(3)
(WDM 34-33-11).
(4)
(WDM 34-33-21).
E. Fault Isolation Procedure
(1)
Replace the LRRA receiver/transmitter, M1735 (No. 1) or M1736 (No. 2). 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.
(2)
Do
this
task:
Low
Range
Radio
Altimeter
(LRRA)
BITE
Procedure,
34-33
TASK
801
(3)
If the LCD display on the LRRA receiver/transmitter shows RADIO ALTIMETER TEST COMPLETE NO FAILURES, then you corrected the fault.
-------------------------END OF TASK ---------------------------
803. LRRA Transmit Antenna Failed -Fault Isolation
A. Description
(1) The task is for this maintenance message:
(a) TRANSMIT ANTENNA FAIL
EFFECTIVITY
34-33 TASKS 802-803
SIL ALL
Page 207 D633A103-SIL Feb 15/2010
B. Possible Causes
(1)
Transmitter antenna, M1737 (No. 1) or M1738 (No. 2).
(2)
Wiring problem.
NOTE: Moisture contamination between the antenna and the airplane skin or in the antenna co-ax connector can cause false altitude output from the Radio Altimeter system.
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