User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 6−22
15 Dec 2005
Table 6−4. Computer Unit Fault Reporting and Corrective Actions
Status
Annunciator
Failure Possible corrective Action
TCAS
PASS
The TCAS Computer Unit
passes its own internal BITE
test
TCAS computer unit is operational. If other
annunciators are on, the problem is in the indicated
subsystem or aircraft wiring.
TCAS
FAIL
The TCAS Computer Unit has
failed its own internal BITE
test
Replace the TCAS computer unit.
TOP
ANT
The top antenna DC
resistance test indicates a
failure
Remove the TCAS computer unit. Use a multimeter
to measure the DC resistances indicated in Table 6−5
for the top antenna. Repair antenna cables or replace
the antenna as required.
BOT
ANT
The bottom antenna DC
resistance test indicates a
failure
Remove the TCAS computer unit. Use a multimeter
to measure the DC resistance indicated in Table 6−5
for the bottom antenna. Repair antenna cable(s) or
replace the antenna as required.
HDG Heading input function not
used
Not applicable
TA
DISP
Traffic advisory display
discrete signals No.1 or No.2
indicate a failure
Check wiring and power to TA display. (On both sides
of the cockpit, if two are installed.) Make sure that
RA/TA valid discrete 1 and 2 (RMP−7E and RMP−7J)
are <3.5 V dc to ground. Repair wiring or replace
display as required.
RA
DISP
Resolution advisory display
discrete signals No.1 or No.2
indicate a failure
Check wiring and power to RA displays. Make sure
that RA valid discrete 1 and 2 (RMP−14C and
RMP−13E) are <3.5 V dc to ground. Repair wiring or
replace display as required.
RAD
ALT
Radio altitude source No.1 or
No.2 is invalid or has failed
Check wiring and power to the radio altimeters. For
analog radio altimeters, make sure the RAD ALT No.1
and No.2 valid discrete (RMP−2K and RBP−3C) are
>18.5 V dc. Repair wiring or replace radio altimeter
as required.
XPDR
BUS
Mode S Transponder No.1 or
No.2 is invalid or has failed.
Check wiring and power to the transponders. Check
for data on XT 429 bus No.1 and No.2 (RMP−14F/G
and RMP−14H/J). Repair wiring or replace
transponder as required. If the Single Mode S
Transponder program pin (RMP−10D) is not grounded
in installations. Computer Units, a XPDR Bus Fault
may be displayed.
ATT Attitude input function not
used.
Not applicable