Transponder causing problems for Airlines on final ????

In article , Garner Miller
wrote:

In article , EDR
wrote:

Sounds like TCAS

TCAS only works with Mode-S transponders.

Who told you that? A Mode C transponder looks the same on a TCAS
screen as Mode S. The only difference is that two Mode-S-equipped
airplanes are able to coordinate a TCAS maneuver (so both airplanes
won't get told "climb" and climb into each other).
TCAS will interact and with Mode C transponders just fine, and will
even show and give a traffic advisory for aircraft with no altitude
encoding at all.

Okay, TCAS I vice TCAS II. Everyone should specify.

"Garner Miller" wrote in message Makes sense, but it's incorrect. At
least with the TCAS system I use,
when below about 1500' AGL, the confict resolution mode is disabled for
exactly that reason.

Most older TCAS will activate the RA mode upon rotation. Last month we had a
TA from a B-767 that had just cleared the runway as we were rotating for
take off. I don't know why it wasn't an RA.

D.

In article ,
"Capt.Doug" wrote:

"Garner Miller" wrote in message Makes sense, but it's incorrect. At
least with the TCAS system I use,
when below about 1500' AGL, the confict resolution mode is disabled for
exactly that reason.

Most older TCAS will activate the RA mode upon rotation.

really? that's a dumb design.

Last month we
had a
TA from a B-767 that had just cleared the runway as we were rotating for
take off. I don't know why it wasn't an RA.

possibly because of the increase in altitude separation.

--
Bob Noel

BULL... the pilot with Mode S gets the warning... but it reads all
Transponders..
BT

"EDR" wrote in message
...
In article et,
Steven P. McNicoll wrote:

There he was, holding for takeoff, ready to go, transponder alive, and
he
gets bitched at by the tower for "causing problems with the airliner's
nav
on final, switch transponder to standby."

Makes sense to anyone ???

Sounds like TCAS

TCAS only works with Mode-S transponders.

Okay, TCAS I vice TCAS II. Everyone should specify.

you did not specify...

BT

I frequently get TCAS traffic alerts referencing aircraft on the ground during
takeoffs and landings.

The TCAS will display traffic with an operating transponder regardless of the
type of transponder, i.e. mode C or S.

G. Lee