9
TIS Operational Procedures
Part One: Section 3
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 are sent
fromtheGTX330.Theusershouldnotstartevasive
maneuversusinginformationfromthe400W/500W
display or on a traffic advisory only. The display and
advisories are intended only for assistance in visually
locatingthetrafc,duetothelackinresolutionand
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
concerningtheintruderaircraft.Basedontheabove
procedures,minoradjustmenttotheverticalight
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.
•Ifthesystempassesthepower-uptestandthe
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.
•Ifthesystemfailsthepower-uptest,the“NO
DATA”,“DATAFAIL”,or“FAILED”message
is displayed. See your installer for corrective
actionifthe“DATAFAIL”,or“FAILED”message
isdisplayed.The“FAILED”messageindicates
theGTX330hasfailed.The“DATAFAIL”mes-
sage indicates data are being received from the
GTX330butafailurewasdetectedinthedata
stream.The“NODATA”messageindicatesthat
dataarenotbeingreceivedfromtheGTX330.
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—Whena60secondperiod
elapses with no data, TIS is considered to be
unavailable.Thisstateisindicatedbythetext
“UNAVAILABLE”(500WSeries)and“UNAVAIL”
(400W Series). The pilot should be aware
that“UNAVAIL”couldindicateaTIScoverage
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).
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.
0.5 nm
Intruder Aircraft
+ 500 ft
This area within 34 seconds
- 500 ft
190-00356-30 Rev C
