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radar PPI and the TA/VSI allow verification of each
type of intruder symbol.The test generates the symbols
arranged as shown.The Traffic Advisory Display
annunciates the word TEST. If the weather radar is in
the TEST function,this pattern appears over the PPI
test pattern.If in a weather function,this test appears
over weather.
Use of the self test function in flight will inhibit TCAS
II and transponder operation for up to 12 seconds.
For this reason,the pilot should use caution when
initiating the test in flight.
NOTE:
Some installations may inhibit the activation of TCAS selftest
in flight. However,TCAS will be placed in STBY while
the Transponder is in self test for approximately 5 sec.
During the TCAS self test operation aircraft pressure altitude,
aircraft Mode-S Address and aircraft maximum airspeed
capability are not monitored.However, these
transponder inputs are always monitored and faults reported
while the TCAS is in one of its active modes -- TA Only
or TA/RA. Altitude Input to the selected transponder is
monitored by the transponder but will not display a fault
message when selecting transponder modes.
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A Resolution A d v i s o ry (red square) will appear at 3
o ’ cl o ck , ra n ge of 2 miles, 1000 feet below and fly i n g
l eve l .
A Tra ffic A d v i s o ry (ye l l ow circle) will appear at 9
o ’ cl o ck , ra n ge of 2 miles 200 feet below and cl i m b i n g .
P roximity tra ffic (solid white diamond) will appear at
1 o’cl o ck , ra n ge of 3.6 miles, 200 feet ab ove descendi
n g .
N o n - T h reat tra ffic (open white diamond) will appear
at 11 o’cl o ck , ra n ge of 3.6 miles, flying level 1000 fe e t
ab ove .
TCAS DISPLAY TEST PATTERN; TCAS FUNCTION,
5 NM RANGE, DEDICATED DISPLAY AND PPI
TA/VSI TEST PATTERN; 5 NM RANGE.
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Collision Avoidance System User’s Manu a l
RA/VSI Flags
and Test
Indicators
During the first few seconds of the TEST the RA/VSI
red and green circumference lights (the
climb/descend indicators) illuminate sequentially.The
TCAS flag is in view throughout the test period.
SEQUENTIAL LAMP TEST
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After the sequential lamp test the red and green
climb/descend lights display a fixed test command
throughout the remainder of the system test.
RA/VSI and
TA/VSI Lamp
Tests
RA/VSI Lamp
Test
At the conclusion of a successful Self Test,a synthesized
voice announces,
“TCAS System Test OK”
If the aircraft wiring includes a lamp test function,
the RA/VSI sequential lamp test can be observed by
activating the Master Lamp Test switch.The test will
continue as long as the switch is held in test position.
FIXED TEST COMMAND
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Collision Avoidance System User’s Manu a l
TA/VSI Lamp
Test
The TA/VSI lamp test produces an array of traffic in
the pattern shown.The climb/descend color bands
alternate between green and red,lasting for two seconds
each.The bands are blank for a one second
interval in between.
NOTE: The VSI function of the TA/VSI will not be
observed during the lamp test.
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Should a VSI failure be detected at any time,the VSI
flag will appear.
Should a failure be detected during Self Test,the
audio message says,
“TCAS System Test Fail”
If the TA display is a PPI or dedicated display, the
appropriate failure message will be displayed.(See
Fault Message Format in Section 3:Controls and
Displays.)
TCAS test audio is inhibited during GPWS and windshear
test or alert.
The CTA-81B function selector is moved to the right
hand test position (switch fully clockwise) to test the
ATCRBS transponder. During the test,segments of the
Transponder Control Unit display window and the
ATC Fail Lamp illuminate.
If a failure of the TCAS systems has occurred, give
Maintenance as much specific information about the
problem as possible.Avoid phrases such as “TCAS
inop”.
Provide information in terms of fault lights lit,audio
announcements,test patterns discrepancies and
screen annunciations that indicate which unit was
observed to have failed.
Failure
Conditions
Test Audio
Inhibit
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TCASII/ACASII Collision Avoidance System User’s Manual(14)
