Transponder causing problems for Airlines on final ????

[Ray Bengen]

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 ???

Ray

[Steven P. McNicoll]

"Ray Bengen" > wrote in message
...
>
> 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

[BTIZ]

I agree.. sounds like the aircrafts on final's TCAS lit off when it picked
up the transponder of the aircraft waiting to depart.. sitting right next to
the runway..

BT

"Steven P. McNicoll" > wrote in message
nk.net...
>
> "Ray Bengen" > wrote in message
> ...
> >
> > 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
>
>

[PS2727]

I think the tower was a bit harsh then because at several large airports ALL
aircraft are asked to keep the transponder on during ground operation all the
way to/from the gate. TCAS systems have a mode which gets rid of most unwanted
warnings for takeoffs and landings. There is nothing at all wrong with turning
the transponder on when approaching #1 for takeoff, it's better than forgetting
to turn it on at all. If it is an ongoing problem at that airport try calling
the folks in the tower to find out why and how they would like transponders
handled on their field.

[OtisWinslow]

I was taught the old "Lights, Camera, Action" thingy when crossing the
hold line onto the runway for takeoff.


"PS2727" > wrote in message
...
> I think the tower was a bit harsh then because at several large airports
ALL
> aircraft are asked to keep the transponder on during ground operation all
the
> way to/from the gate. TCAS systems have a mode which gets rid of most
unwanted
> warnings for takeoffs and landings. There is nothing at all wrong with
turning
> the transponder on when approaching #1 for takeoff, it's better than
forgetting
> to turn it on at all. If it is an ongoing problem at that airport try
calling
> the folks in the tower to find out why and how they would like
transponders
> handled on their field.

[EDR]

In article t>,
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.

[Tom Sixkiller]

"EDR" > wrote in message
...
> In article t>,
> 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.

Why wouldn't that be the case here?

[Steven P. McNicoll]

"EDR" > wrote in message
...
>
> TCAS only works with Mode-S transponders.
>

Negative.

[Garner Miller]

In article >, Ray Bengen
> 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 ???

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. The other transponders will paint on the screen,
but that's about all the ones on the ground will do.

--
Garner R. Miller
ATP/CFII/MEI
Manchester, CT =USA=

[Garner Miller]

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.

--
Garner R. Miller
ATP/CFII/MEI
Manchester, CT =USA=

[EDR]

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.

[Capt.Doug]

>"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.

[Bob Noel]

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

[BTIZ]

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

"EDR" > wrote in message
...
> In article t>,
> 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.

[BTIZ]

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

you did not specify...

BT

[JDMX5er]

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