stops or is erratic.
TAS 1000 shows no RS232 error .
First things to check are the TAT, SAT values on TAS
1000 in flight.
If they are way off , check installed OAT probe and OAT
wiring harness on ground.
See - Test
OAT Probe -
Accuracy and Resolution of
the TAS 1000
values for the wind components that are displayed by
your GPS receiver and the TAS 1000 do not exactly match.
of the various GPS receivers on the market, along with
the equally various methods of passing information from
each GPS receiver, the TAS 1000 and the GPS receiver
communicate with each other at different speeds.
When the TAS 1000
calculates the winds, it uses the ground speed and track
information that was received from the GPS receiver, OAT
from installed probe and uses these values along with
values from the heading and true air speed, to calculate
the wind speed and direction.
However, because of
variations in how each individual GPS receiver handles
the information, the data being handed to the TAS 1000
may not match what is being displayed on the screen. As
an example, some GPS receivers on the market utilize
averaging for wind components. Since the GPS receiver is
displaying the average wind, and the TAS has received
the current, non-averaged value, there may be a
difference between what you see on the TAS and GPS
TAS 1000 course and my GPS course do not always agree
when I am in a turn. Is there a problem with the unit?
factor that can appear to affect the accuracy of the TAS
1000 is the typical course drift of your average,
everyday flight. The TAS 1000 and GPS communicate
approximately every 1.5 seconds. During this time, an
airplane in flight can experience a drift based heading
change of as much as 3 degrees. When the GPS updates the
wind information, it could therefore cause the TAS to be
using information that is 3 degrees off from the
This is the reason why the
TAS 1000 will constantly monitor the heading and track
change, and will try to correct the wind information as
much as possible to eliminate the errors that this
process can introduce.
Naturally, the faster your
GPS receiver can communicate with the TAS, the better
the accuracy of the resulting wind data will be.
air and wind information on my GPS receiver has more
digits, is the TAS losing information?
order to handle and manage the volumes of data and
communication that have to take place between the TAS
1000 and the GPS receiver, the TAS employs simple
rounding of the data. When we developed the TAS, we had
to find the best balance between rapid information and
accuracy. Based on the feedback from our customers,
along with years of flying experience, we elected to
provide more accurate information rather than largely
The results of this effort
can be seen in the TAS 1000. The accuracy is the unit is
approximately 1.5%, with 2 knots as the maximum expected
error in speed. While this may present some minor
differences between the displayed data on the GPS and
the TAS, the long-term operation of the unit as well as
the pilot's ability to interpret and use the produced
data are enhanced over all other configurations that we
Windicator on Start and Taxi
Momentarily displays the
software version number.
Performs a self test with
all LEDs on.
A walking dot on the outer ring will
The photo cell on the TAS
1000 unit controls the display brightness on both the
TAS 1000 and Windicator.
Windicator on Take-Off
The walking dot will remain on the Windicator display
until the aircraft is in flight.
Once the aircraft is
in flight and all five elements needed for processing
winds aloft can be processed by the TAS 1000 will the
Windicator graphically show wind data.
The five elements used for
wind calculations are:
1) True Air Speed from TAS
2) Aircraft heading
3) GPS track
5) OAT probe
The flight data produced by
the TAS 1000 will be equal to the data that you input
into the system. Changing fuel quantities while in
flight, not entering the complete barometer reading, or
taking shortcuts on the entry of critical data will all
act to reduce the accuracy of the TAS 1000.
Taking the time to assure
that your data is correctly entered will help you to get
the best accuracy and highest quality data from of your