Garmin GDL 69A GPS Receiver User Manual


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3
TIS Operation and Symbology
Part One: Section 1
andavoid.”Someofthemorecommonexamplesof
these errors follow:
• Whenclientorintruderaircraftmaneuversexces-
sively or abruptly, thetrackingalgorithm may
reportincorrecthorizontalposition until the
maneuveringaircraftstabilizes.
• When a rapidly closing intruder is on a course that
crosses the client aircraft course at a shallow angle
(eitherovertakingorheadon)andeitheraircraft
abruptly changes course within ¼ NM, TIS may
display the intruder on the opposite side of the
client than it actually is.
These are relatively rare occurrences and will
be corrected in a few radar scans once the course
has stabilized.
Improving TIS
UsersofTIScanrendervaluableassistancein
the correction of malfunctions by reporting their
observationsofundesirableperformance.Reporters
should identify the time of observation, location, type
and identity of aircraft, and describe the condition
observed; the type of transponder processor and soft-
ware in use can also be useful information. Since TIS
performance is monitored by maintenance personnel
other than ATC, it is suggested that malfunctions be
reported in the following ways:
• BytelephonetothenearestFlightServiceStation
(FSS)facility.
• ByFAAForm8000-7,SafetyImprovementReport,
a postage-paid card designed for this purpose.
ThesecardsmaybeobtainedatFAAFSSs,General
AviationDistrictOfces,FlightStandardsDistrict
Ofces,andGeneralAviationFixedBasedOpera-
tions.
TIS Symbology
TIStrafcisdisplayedonthe400W/500WSeries
unit according to TCAS symbology, graphically
displayed on a dedicated graphical page (Traffic Page;
see below), and on the moving Map Page. A Traffic
Advisory (TA) symbol appears as a solid yellow circle
(or half circle on the outer range ring if the traffic
is outside the range of the dedicated Traffic Page).
All other traffic is displayed as a hollow white dia-
mond. Altitude deviation from own aircraft altitude
is displayed above the target symbol if traffic is above
own aircraft altitude, and below the symbol if they are
below own aircraft altitude. Altitude trend is displayed
asanuparrow(>+500ft/min),downarrow(<-500
ft/min),ornosymboliflessthan500ft/minratein
either direction.
•TrafcAdvisories(TA)—Yellow
•ProximityAdvisories(PA)—White
•Other—White
190-00356-30 Rev C
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