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Transponders

Twocky61
post Apr 22 2014, 04:25 PM
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Group: Student Forum Pilot
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Joined: 21-April 14
From: Christchurch Dorset uk
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I have emailed both the FAA in the US & the CAA in the uk this question and they both failed to reply:

On the 9-11 flights the terrorists disabled the transponders, thus the atc controllers were only able to track the airliners call signs and radar blip, 'on primary'. With transponders on then atc controllers have all available information on the aircraft, plus they would also have had a 7700 Sqwark if the pilots were able to activate it

So the question is this:

Why are transponders not permanantly on as are black boxes? In what situation would a transponder need to be disabled?

Thanks

This post has been edited by Twocky61: Apr 22 2014, 04:27 PM
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excontroller
post Apr 22 2014, 05:14 PM
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QUOTE (Twocky61 @ Apr 22 2014, 03:25 PM) *
I have emailed both the FAA in the US & the CAA in the uk this question and they both failed to reply:

On the 9-11 flights the terrorists disabled the transponders, thus the atc controllers were only able to track the airliners call signs and radar blip, 'on primary'. With transponders on then atc controllers have all available information on the aircraft, plus they would also have had a 7700 Sqwark if the pilots were able to activate it

So the question is this:

Why are transponders not permanantly on as are black boxes? In what situation would a transponder need to be disabled?

Thanks

Transponders are simply electronic transmitters that are interrogated by ground receivers to identify aircraft for air traffic control. Like nearly any electronic device, there is an on/off switch. I worked in a tower 33 years ago but I'd say probably they must be turned off while taxiing around an airport to relieve some congestion that would assuredly occur on an airport like ATL, JFK, ORD, etc. Those places have GROUND radar. That being the case, the fact they were turned off STILL has little bearing on the events of that day. You have to focus on TWO things in this situation, what happened 9/11/01.....and what resulted in the ensuing years, (ie. what we have NOW). Taken together, the big picture certainly should make most reasonable people believe all is NOT as we are told.
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MikeR
post Apr 22 2014, 05:49 PM
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Group: Private Forum Pilot
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QUOTE (excontroller @ Apr 23 2014, 09:14 AM) *
Taken together, the big picture certainly should make most reasonable people believe all is NOT as we are told.


After endless official 9/11 stories were exposed
as lies, when a couple of big bangs were reported
at Boston last year, it was smart to start checking for
evidence of fraud from the get-go.

Who here was disappointed or surprised
on discovering the first amputee had in fact
lost limbs a coupla years before the Big Bang?

Then a second turns up in hospital
with similar contraindications....**

What official 9/11 story can we believe now?


MikeR

(** Absolutely NO disrespect for anybody's real suffering:
what's referred to here is only the fraudulent crisis acting ... )

This post has been edited by MikeR: Apr 22 2014, 06:05 PM
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tumetuestumefais...
post Apr 22 2014, 06:27 PM
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There actually is the Mode-S transponder - a newer better transponder than old Mode-3 avoiding the congestion problem with radio multicast interrogation present with Mode-3, identifies the planes using unique code/squawk bound to aircraft registration/tail number and assigned by FAA/ICAO and it is mandatory for all major airliners including American and United and it was mandatory already in the 2001 through so called TCAS (Traffic Collision and Avoidance System) which uses Mode S transponder interrogation and which is mandatory in USA from 1993 when US Congress passed law mandating major airliners to have the TCAS.

The Mode S was developed by the Lincoln Labs/MIT already since 1968 (- and already then the newly formed DOT ATCAC decided the ATCRBS - the Mode-3 transponders + the ground Mode 3 secondary radar systems - are inadequate), tested at Boston Logan and according to this presentation from December 2000 there were Mode S facilities already at 108 busiest US airports and majority of the planes landing there had even then already the Mode S transponders including the 9/11 attack planes.

The unique Mode S squawks for the 9/11 attack planes were:
N334AA/"AA11": 50722254/A3A4AC
N644AA/"AA77": 52072030/A87418
N612UA/"UA175": 51773757/A7F7EF
N591UA/"UA93": 51721341/A7A2E1
(source)

Now, there are maybe even more burning questions to FAA than yours:
Where are the logs from the Mode S ground facilities from 9/11, where are the TCAS/Mode S logs from the planes which passed nearby the 9/11 attack planes and likely must have made automatic Mode S interrogations with the 9/11 attack planes? ...dunno.gif
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Twocky61
post Apr 23 2014, 03:19 AM
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Thanks for that excontrollerm MikeR &
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Twocky61
post Apr 23 2014, 03:28 AM
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Group: Student Forum Pilot
Posts: 10
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From: Christchurch Dorset uk
Member No.: 7,781



Thanks for those informative replies excontroller MikeR & tumetuestumefaisdubien

so there definately must be some sort of cover-up going on or alien.gif influence, (well actually I doubt alien.gif even if they exist) & even if there is a cover-up I suppose we will never know

Thanks again

This post has been edited by Twocky61: Apr 23 2014, 03:28 AM
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