Section 3: TIS Operational Procedures
Introduction
TIS warns the user with voice and visual traffic
advisories whenever it predicts an intruder to be a
threat (see illustration). Voice and visual data is sent
from the GTX 330. The user should not start evasive
maneuvers using information from the 400W/500W
display or on a traffic advisory only. The display and
advisories are intended only for assistance in visually
locating the traffic, due to the lack in resolution and
coordination ability. The flight crew should attempt
to visually acquire the intruder aircraft and maintain
a safe separation in accordance with the regulatory
requirements and good operating practice. If the flight
crew cannot visually acquire the aircraft, they should
contact ATC to obtain any information that may assist
concerning the intruder aircraft. Based on the above
procedures, minor adjustment to the vertical flight
path consistent with air traffic requirements are not
considered evasive maneuvers.
Power-Up Test
The TIS interface performs an automatic test
during power-up.
• If the system passes the power-up test, the
Standby Screen appears on the Traffic Page.
• If the system passes the power-up test and the
aircraft is airborne (as determined by system
configuration at the time of installation, see
your installer for detailed criteria information),
traffic is displayable on the Traffic Page in oper-
ating mode.
• If the system fails the power-up test, the "NO
DATA", "DATA FAIL", or "FAILED" message
is displayed. See your installer for corrective
action if the "DATA FAIL", or "FAILED" message
is displayed. The "FAILED" message indicates
the GTX 330 has failed. The "DATA FAIL" mes-
sage indicates data is being received from the
GTX 330 but a failure was detected in the data
stream. The "NO DATA" message indicates that
data is not being received from the GTX 330.
NOTE: "NO DATA" may be a normal mode of opera-
tion in a dual transponder installation where the GTX
330 with TIS is not the selected transponder.
• UNAVAIL — When a 60 second period
elapses with no data, TIS is considered to be
unavailable. This state is indicated by the text
"UNAVAILABLE" (500W Series) and "UNAVAIL"
(400W Series). The pilot should be aware
that "UNAVAIL" could indicate a TIS coverage
limitation due to a line-of-sight situation, a low
altitude condition, no TIS service, or a result
of flying directly over the radar site providing
coverage (cone of silence).
0.5 nm
This area within 34 seconds
Conditions for Traffic Advisories
The following condition causes TIS to display a Traffic
Advisory (TA) on the 400W/500W Series unit:
• The intruder aircraft approaches your aircraft on
a course that will intercept (defined by a 0.5 NM
horizontal radius and a relative altitude of ± 500
feet) your course within 34 seconds.
Part One: Section 3
TIS Operational Procedures
Intruder Aircraft
+ 500 ft
- 500 ft
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