A321 Antenna

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3rd July 2019 | 19:31

#1 (permalink)

Altcrznav

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From: USA

A321 Antenna

Any thoughts as to what this antenna is for? And no, the TCAS one is the circular one to the aft.

3rd July 2019 | 20:13

#2 (permalink)

Exrigger

Joined: Dec 2006

Posts: 492

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From: Lincoln

Possibly a Marker Beacon Antenna:

Marker Beacon Antenna Archives - Sensor Systems Inc., Aircraft Antenna

3rd July 2019 | 20:20

#3 (permalink)

tubby linton

Joined: Mar 2007

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From: Here and there

A very reputable source to the A320f says that it is the Tcas.

3rd July 2019 | 20:22

#4 (permalink)

Altcrznav

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From: USA

Quote:

Originally Posted by tubby linton

A very reputable source to the A320f says that it is the Tcas.

The round antenna is TCAS.

3rd July 2019 | 20:31

#5 (permalink)

tubby linton

Joined: Mar 2007

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From: Here and there

I think the round one is the gps and the flat one tcas. There are lots of images here.
TCAS Antenna Archives - Sensor Systems Inc., Aircraft Antenna

3rd July 2019 | 20:56

#6 (permalink)

AerocatS2A

Joined: Jan 2004

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From: Here and there

Quote:

Originally Posted by Altcrznav

The round antenna is TCAS.

Why so certain the round one is TCAS?

4th July 2019 | 00:11

#7 (permalink)

Smithy02

Joined: Jul 2016

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From: Everywhere

Our A320 do not have ADFs fitted but that looks like an ADF sense antenna to me.

S02

4th July 2019 | 00:23

#8 (permalink)

Altcrznav

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From: USA

Quote:

Originally Posted by Smithy02

Our A320 do not have ADFs fitted but that looks like an ADF sense antenna to me.

S02

ADF antennas are on top.

4th July 2019 | 00:25

#9 (permalink)

Altcrznav

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From: USA

I’m thinking it is a plug for the old TCAS I antenna. When aircraft was upgraded to TCAS II, the ACSS round antenna was installed.

4th July 2019 | 00:44

#10 (permalink)

LookingForAJob

Joined: Jun 2001

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From: Wherever someone will pay me to do fun stuff

A bit of Googling (and only a little bit) 'cos I'm bored suggests it's a MKR.

4th July 2019 | 08:00

#11 (permalink)

pineteam

Joined: Jul 2006

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From: Somewhere over the rainbow

How old is this A321? It surely looks like a TCAS antenna.

4th July 2019 | 09:49

#12 (permalink)

sonicbum

Joined: Mar 2012

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From: Having a margarita on the beach

If it's not the TCAS then it must be the Marker. Can't think of anything else with that shape.

4th July 2019 | 10:22

#13 (permalink)

FlightDetent

Only half a speed-brake

Joined: Apr 2003

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From: Commuting not home

The Chemtrails Report Interchange Beam is not displayed for logical reasons, but the location varies for that one anyway.

4th July 2019 | 11:45

#14 (permalink)

Station Zero

Joined: Sep 2016

Posts: 50

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From: Singapore

Round one behind is TCAS, not likely to be ATC or DME as they are the small yellow ones.

My guess some kind of air to ground coms, possibly cellular or some kind of gatelink. Not standard as there is a skin doubler externally for it.

5th July 2019 | 17:50

#15 (permalink)

Altcrznav

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From: USA

Solved

It is not an antenna but a cover plate for the old ATG-4 antenna used for our terrestrial-based internet. We're completely switched over to satellite so, obviously, these antennas were removed.

Gogo ATG-4 - what is it, and how does it work? - Gogo Concourse Blog