Chuck wrote On 10/29/05 14:31,:
Unnerveing thing happen to me today.
I have TIS displayed on the Garmin 430.
I was 15 or 20 miles north of Moraine (I73) in southern Ohio and
talking to Dayton Controller under Flight Following.
I'm at 4500 ft and landing at Moraine. I request (I'm in his air
space) the controller that I would like to start my decent and he says
cleared to decend. Shortly, the display squacks and says "traffic" and
I see a traffic indicated at 500 ft below. I tell controller that I
have traffic on my display 500 ft below and he says "Yes, it is a 172
going into Moraine also."

So now we have a low wing (my Archer) above a high wing (172) and I
have been cleared to decend. I tell the controller that I am stopping
my decent and turning left 30 deg (and speeding up). He did not
respond. The 430 display over the next minute shows seperation and I
turn back to course and see the 172. I continue to keep my speed
greater that his and we both land without further problem.

Welcome to the wonderful world of TIS. Now you can really see what the
controller sees, and be scared. I have seen some amazing things with TIS,
including a near collision between two other aircraft in front of me.

Now, I'm going to side, a little bit, with the controllers on this. I
was visiting the tower, and the controller said to me, some "some guys
have TCAS, because they don't trust us". That's exactly the way they
see it, that you are getting into *their* business.

Now take a typical situation. You are (apparently) closing on another
aircraft. You see the TIS, you make an evasive manuver. The problem
is, the controller, who is watching the entire picture, had it worked
out, and knew you were going to pass behind that aircraft. Now, you
are manuvering, and you have thrown all his cards in the air.

I'm not saying that in this situation you are definately wrong or
definately right, I am just saying that you can cause more harm than
good by second guessing the controller. He has a bigger picture than you
do with that TIS.


I think TIS may have saved my ( and others) life today and the FAA is
decomissioning the sites with the explination that ADS-B is going to be
better when they get it implemented in the next few years and an an
inexpensive plane electronic becomes available.

God, I wish I knew how to stop this decomissioning of TIS before ADS-B
is widely available. My life (and maybe yours) may depend on it.

Chuck


Its worse than that. ADS-B comes with dramatically greater equipment
requirements and expense. The UAT required with ADS-B is $8,000
(garmin). It dosen't stop there. the AIRLINE ARE NOT GOING TO USE
UAT, so you are going to spend all that money and STILL not see
the largest peices of metal in the sky. Oh, the FAA is going to
"cross link" you with the transponder based system that the
airliners are still going to use. Meaning that unless you are both
in radar contact, you won't see each other, neatly chopping off the
biggest advantage of the system, that it works outside radar
coverage.

So thats the FAA solution: More cost to you, less functionality,
less safety! Yea!