曝光台 注意防骗
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in the intruding aircraft:
• The intruding aircraft must be equipped with
a properly operating transponder for normal
TCAS operation.TCAS is unable to detect any
aircraft without an operating transponder.
• If the intruder is Non-Altitude Reporting
(NAR),TCAS will display only the range and
bearing.It can issue a Traffic Advisory based
on distance and direction of flight but will not
generate a Resolution Advisory. TCAS assumes
Non-Altitude Reporting (NAR) traffic is at the
same altitude as your own aircraft.
TCAS does not display NAR traffic above 14,500 feet.
A TCAS II Resolution Advisory is based on the expectation
that the crew will comply within 5 seconds.
Any modification to the initial RA,including an
increase or reversal to an RA, requires two and one
half seconds reaction time.
The TCAS II processor is programmed with the specific
aircraft operating limitations,i.e.,maximum altitude
at which the aircraft can climb at 1500 feet per
minute.Climb or Increase Climb RAs are therefore
inhibited when the RA maneuver cannot be completed
safely due to lack of aircraft performance capability.
These performance limits are included as part of
the aircraft wiring.See the AFM (Airplane Flight
Manual) for the specific performance limitations for
your aircraft.
Wiring options for TCAS also include the following:
• TCAS II can be wired to display all traffic full
time or all traffic only as a result of the presence
of a TA or an RA.
• The TCAS display may have pilot selectable
range or may be a fixed range controlled by
Warnings
and
Limitations
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the aircraft wiring.
• The TCAS II system can be automatically placed in
standby when the aircraft is on the ground.
• The IVA-81A/IVA-81D can be wired to clear the display
automatically after a TA or RA passes,or by
pressing the TA SEL button,if applicable.
• The manually initiated TCAS test procedure can be
inhibited in flight.However, this does not inhibit
the transponder self test and TCAS will be placed in
STBY during transponder Self-Test for approximately
5 sec.
• The aircraft Master Lamp Test Switch can be wired
to control the TA/VSI and RA/VSI sequential lamp
test.
• TCAS can be wired to inhibit display of Traffic on
the ground when your own aircraft is below 1700
±50 feet AGL.If configured this way, aircraft on the
ground disappear as you descend through 1650
feet and reappear on the traffic display as you
climb above 1750 feet.TCAS II designates “On-
Ground”traffic by comparing own aircraft radio
altitude and pressure altitude.Any intruder estimated
by TCAS to be within 380 feet of the ground
descending or 400 feet ascending will be categorized
“On-Ground.” If not configured this way, all
“On-Ground”intruders are displayed as non-threat
traffic (open white diamond).(Change 6.04a)
TCAS II does not display traf fic on the ground.
(Change 7.0)
In general,if the intruder is within 380 ±20 feet of the
ground it will not be displayed. When another aircraft
lands,it may take approximately 20 seconds for TCAS II to
determine that it has done so.(Change 7.0)
When TCAS II is on the ground,it will display existing
tracks down to 150 feet of the ground. Again,it may take
20 seconds for the system to determine that the aircraft
has landed.(Change 7.0)
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Refer to the Airplane Flight Manual for the specific operational
features of your particular TCAS installation.
Increase Descent Resolution Advisories are inhibited
below 1450 feet AGL.(Change 6.04a)
Increase Descent Resolution Advisories are inhibited
below 1450 feet AGL while descending and 1650 feet
AGL while ascending.(Change 7.0)
All Resolution Advisories are inhibited below 900 feet
descending or 1100 feet ascending.
All TCAS II audio warnings are inhibited below 900 feet
Radio Altitude on approach and up to 1100 feet Radio
Altitude on departure.(Change 6.04a)
All TCAS II audio warnings are inhibited below 400 feet
Radio Altitude on approach and up to 600 feet Radio
Altitude on departure.(Change 7.0)
Maneuvers based solely on the TCAS Traffic Display are
prohibited by the AFM.
RAs should be followed without the autopilot or
autothrottle system engaged.
TCAS II tracking range can be severely limited in high
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TCASII/ACASII Collision Avoidance System User’s Manual(12)
