M
Maxel
Guest
Yes, I know, this is my first post and I'm already complaining! I have been lurking and reading and I'm to the point that if I don't say something I'm going to blow a gasket or an artery or something.
I would like an explanation from those who continually beat the drum of this topic. But first, a little factual background.
When an aircraft goes to make a flight, the following happens: (let us all pretend that we are hypothetically speaking of the real aircraft here that crashed into the pentagon)
Prior to the flight a flight-plan must be filed, including particulars such as destination, fuel, requested route, AIRCRAFT TYPE, etc.
When it is ready to depart, the aircraft comes on the "ground control" frequency of the air traffic control tower. (there are several people working in a tower specially a major tower at a major city) The pilot requests his clearance and his permission to taxi.
The controller looks around, sees the aircraft at the "gate" and if there are no conflicts gives the permission.
The aircraft then taxiis into position and is given the frequency for "local control". This is the person that gives aircraft the clearances to land or to take off. He must visually see the aircraft.
The aircraft is given his clearance to take off, the controller keeps an eye on it until it is far enough to clear another one for take-off or for landing. The aircraft is then given the frequency to go to for departure-control.
A TRACON or terminal radar area aproach and departure control is a darkened room usually collocated with the tower where the controllers sit at their radar consoles. The original aircraft comes up on their frequency and is verified on radar.
Now here let's make a distinction: There is primary radar and secondary radar. A primary radar site will send out radar waves that "bounce" back to the antenna, thus giving the equipment range and azimuth. In other words the aircraft position. It can also pick up showers, thunderstorms. large flocks of birds, missiles, etc.
A secondary radar operates on a different principle. As it scans the sky it "interrogates" the transponder aboard the aircraft or the IFF on military aircraft (Identification Friend or Foe). This radar cannot pick up objects that do not have a transponder.
The radars at Tracons are almost always BOTH. (I don't know of any that are not, but there may be, but certainly not at a major terminal)
Now back to our aircraft: It will be cleared to a specific point/altitude and told to contact "Center" (Air Route Traffic Control Center- a building with several hundred people working there) at a specified frequency. The Center operates with secondary radar unless it's an emergency (Secondary radar Outage) (The aircraft has been on radar and has been followed/monitored by a controller THE ENTIRE TIME.
The aircraft continues along its cleared path and contacts the center frequency: Something such as "Center, this American 321 with you on 132.5." The controller responds with: "American 321 Washington Center, RADAR CONTACT. (or Boston Center or whatever). That means the controller has verified the aircraft is on his radar scope and he has assumed responsibility for the aircraft. The pilot is then given any further clearances.
Our aircraft continues its climb along its route and suddenly things start to go wrong. The airplane begins to turn, change altitude and direction etc. The controller attempts to talk to the pilot with limited success. The closest facilities with primary radar are alerted (both civilian and military).
This aircraft who has been followed/tracked the entire time then flies towards Washington and crashes into the Pentagon. It is all on radar tapes that can be played back (and voice tapes as well)
Can somebody explain to me how a missile was substituted for the aircraft and where the real airplane went?
I would like an explanation from those who continually beat the drum of this topic. But first, a little factual background.
When an aircraft goes to make a flight, the following happens: (let us all pretend that we are hypothetically speaking of the real aircraft here that crashed into the pentagon)
Prior to the flight a flight-plan must be filed, including particulars such as destination, fuel, requested route, AIRCRAFT TYPE, etc.
When it is ready to depart, the aircraft comes on the "ground control" frequency of the air traffic control tower. (there are several people working in a tower specially a major tower at a major city) The pilot requests his clearance and his permission to taxi.
The controller looks around, sees the aircraft at the "gate" and if there are no conflicts gives the permission.
The aircraft then taxiis into position and is given the frequency for "local control". This is the person that gives aircraft the clearances to land or to take off. He must visually see the aircraft.
The aircraft is given his clearance to take off, the controller keeps an eye on it until it is far enough to clear another one for take-off or for landing. The aircraft is then given the frequency to go to for departure-control.
A TRACON or terminal radar area aproach and departure control is a darkened room usually collocated with the tower where the controllers sit at their radar consoles. The original aircraft comes up on their frequency and is verified on radar.
Now here let's make a distinction: There is primary radar and secondary radar. A primary radar site will send out radar waves that "bounce" back to the antenna, thus giving the equipment range and azimuth. In other words the aircraft position. It can also pick up showers, thunderstorms. large flocks of birds, missiles, etc.
A secondary radar operates on a different principle. As it scans the sky it "interrogates" the transponder aboard the aircraft or the IFF on military aircraft (Identification Friend or Foe). This radar cannot pick up objects that do not have a transponder.
The radars at Tracons are almost always BOTH. (I don't know of any that are not, but there may be, but certainly not at a major terminal)
Now back to our aircraft: It will be cleared to a specific point/altitude and told to contact "Center" (Air Route Traffic Control Center- a building with several hundred people working there) at a specified frequency. The Center operates with secondary radar unless it's an emergency (Secondary radar Outage) (The aircraft has been on radar and has been followed/monitored by a controller THE ENTIRE TIME.
The aircraft continues along its cleared path and contacts the center frequency: Something such as "Center, this American 321 with you on 132.5." The controller responds with: "American 321 Washington Center, RADAR CONTACT. (or Boston Center or whatever). That means the controller has verified the aircraft is on his radar scope and he has assumed responsibility for the aircraft. The pilot is then given any further clearances.
Our aircraft continues its climb along its route and suddenly things start to go wrong. The airplane begins to turn, change altitude and direction etc. The controller attempts to talk to the pilot with limited success. The closest facilities with primary radar are alerted (both civilian and military).
This aircraft who has been followed/tracked the entire time then flies towards Washington and crashes into the Pentagon. It is all on radar tapes that can be played back (and voice tapes as well)
Can somebody explain to me how a missile was substituted for the aircraft and where the real airplane went?