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traffic areas. This is especially true of high traffic areas
with a high density of TCAS equipped aircraft such as
terminal areas and while on the ground. While on the
ground, range may be reduced to below 5 miles. After
takeoff range will increase,but may still be limited to
under 10 miles.
This tracking range limiting is required in order to comply
with FAA regulations,to ensure that TCAS II will not
interfere with ATC ground station tracking. This should
not be interpreted as a system malfunction.
The RDR-1E/ED and RDR-1F radar transmitters are controlled
from a separate Radar Control Panel.When 5 or
10 mile NO WXR range is selected on the PPI-1U, the
transmitter continues to radiate if an active mode (any
mode except TEST) is selected on the Radar Control
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Collision Avoidance System User’s Manu a l
Panel.Refer to the appropriate Weather Radar
Operating Manual for Cautions and Limitations as prescribed
by FAA Advisory Circular 20-68B.
Always attempt to visually clear the airspace before
maneuvering your aircraft in response to a TCAS advisory.
Do not over react to a Resolution Advisory. Fly
only the vertical speed commanded. Using higher
vertical speeds than that shown on the RA/VSI is
NOT better. Be alert and comply with modified or
weakening RAs (annunciated by “Adjust Vertical
Speed,Adjust” for Change 7.0,or “Monitor Vertical
Speed” for Change 6.04a) to minimize your displacement
from your ATC clearance.
The TCAS installation is required to be wired to give
GPWS and Wind Shear higher priority than TCAS.In
case of simultaneous audio alarms,the TCAS II system
is placed in TA ONLY mode (aural annunciations are
inhibited) and the TA/VSI and RA/VSI flag will show
RA OFF.
Cautions
When TCAS commands a corrective Resolution
Advisory, sufficient time exists to perform a smooth
vertical maneuver to avoid the conflict.TCAS II
expects five second crew reaction time to initial RAs,
requiring approximately .25 G. A change to the initial
RA,including an increase or reversal, requires two
and one-half seconds reaction time and up to .35 G.
It is possible to see an aircraft flying the same course
and direction as your own aircraft and be in close
proximity to your aircraft, yet TCAS II may not consider
it a threat.TCAS II calculates the closure rate of the
intruder, and derives the time to the closest point of
approach (CPA).If there is no closure rate,no advisory
will be issued,unless the intruder is very close
(within approximately 1/4 mile).
Conversely, traffic at the same altitude very far ahead
may be shown as an RA by TCAS because of a very
rapid closure rate.
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Collision Avoidance System User’s Manu a l
Notes
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SECTION 5
Appendix
Functional and Automatic Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
RA/VSI Flags and Test Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
RA/VSI and TA/VSI Lamp Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Failure Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Post Flight Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Glossary of TCAS Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
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Collision Avoidance System User’s Manu a l
Functional
and
Automatic
Self Test
The Mode S transponder and TCAS Functional Test
determines the operational status of the entire system.
The test is initiated by rotating the function
selector knob on the Transponder Control Panel to
the counter-clockwise TEST position for one second.
Thereafter, the test continues automatically for a period
of approximately twelve seconds.During the test
the TCAS II and transponder function is inhibited.
When the knob is held for longer than twelve seconds
the system remains in test until it is released.
If the weather radar indicator is OFF,warm up time
for the weather radar indicators is about 5 seconds.
During the first few seconds of the test sequence,the
control panel,the ITA-81A Dedicated Traffic Display,
the radar indicators,the TA/VSI,and the RA/VSI execute
a display test.
A test pattern appearing on the dedicated display, the
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