Garmin G1000 Pilot's Manual page 344

APPENDIX E
NOTE: TIS is unavailable at low altitudes in many
areas of the United States. This is often the case
in mountainous regions.
TIS information is collected during a single radar
sweep. Collected information is then sent through the
Mode S uplink on the next radar sweep. Because of this,
the surveillance information is approximately five seconds
old. TIS ground station tracking software uses prediction
algorithms to compensate for this delay. These algorithms
uses track history data to calculate expected intruder posi-
tions consistent with the time of display. Occasionally, air-
craft maneuvering may cause variations in this calculation
and create slight errors on the Traffic Map Page. Errors
affect relative bearing information and target track vector.
This can cause a delay in the displayed intruder informa-
tion. However, intruder distance and altitude typically
remain relatively accurate and may be used to assist in
spotting traffic.
The following errors are common examples:
• When the client or intruder aircraft maneuvers
excessively 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 intercepts the client aircraft course at a shal-
low angle (either overtaking or head-on), and
either aircraft abruptly changes course within
0.25 nautical miles, TIS may display the intruder
aircraft on the incorrect side of the client aircraft.
These are rare occurrences and are typically resolved
within a few radar sweeps once the client/intruder aircraft
course stabilizes.
E-2
Pilots using TIS can provide 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 the
aircraft, and describe the condition observed. Reports
should also include the type of transponder and transpon-
der software version as well. Since TIS performance is
monitored by maintenance personnel, not ATC, malfunc-
tions should be reported in the following ways:
Garmin G1000 Pilot's Guide for Cessna Nav III
• By telephone to the nearest Flight Service Station
(FSS) facility.
• By FAA Form 8000-7, Safety Improvement Report
(Postage-paid card can be obtained at FAA FSSs,
General Aviation District Offices, Flight Standards
District Offices, and General Aviation Fixed Base
Operators).
190-00498-00 Rev. A