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Originally posted by pro420
The official story was that the terrorists hijacked the planes and flew them into there destination. Now what im about to say might already have been said on ATS or not. This is my view. The official story doesn't make since to me. How did the terrorists know where to fly??? It's impossible to fly to a destination without help from a control center (you know what i mean). So how the hell did the terrorists know where to fly?? the government never says that they were contacted by the terrorists asking them directions or saying that they hijacked the planes. Im sure the terrorists never did contact the control center so that being said how did they know where to fly???????????????????????????????????
Mod Edit: All caps removed. Please see The use of All Caps. Thank you - Jak
[edit on 31/3/08 by JAK]
Originally posted by weedwhacker
reply to post by qwertz
Again, qwertz, I have to pipe up to clear up some facts.
In 2001 not all jets had GPS updating to the IRS. The IRS platform is initialized, at the gate, before departure. The airplane cannot be moved during this approx 8-10 process. The Inertial Reference System has at its heart three laser-ring gyros, and is incredibly sensitive to movement once it is fully initialized. It uses the principle of 'precession' in a gyroscope to calculate motion, direction and velocity, once fully stabilized.
In order to properly initialize, Laitude and Longitude data is typed in. We get these data from our Jeppeson charts. What's more, the system remembers where it was last shut down, and if there's a huge discrepancy, then it will show a 'fault', and you have to start over. Also, it can detect the rotation of the Earth, so if the Latitude entered is too far out of range, it will also fault. It CANNOT tell North or South latitude, except that it remembers where it was last shut down.
Once up, the IRS (there are two of them) are updated by VOR bearing/bearing and DME info. Relatively recently, as airlines upgrade equipment, GPS updating is more and more prevalent, and of course much more accurate. GPS capability is going to be needed in the near future, as traffic increases....it is also needed for the new GPS instrument approaches being developed.
The IRS is the platform that interfaces with the rest of the systems, including the FMS I mentioned in an earlier post.
Finally, there was no need for amateur 'pilots' (or terrorists) to need to know how to operate the autopilot. Just how to disconnect it (easy) and to silence the siren after the disconnect (and a few minutes in a real simulator would have told them all they needed to know).
Hope this helps fill-in the story of what actually happens in a modern commercial jet.
Originally posted by weedwhacker
reply to post by qwertz
qwertz, in fact, if it was an 'inside job', then it would probably have needed good CAVU weather to pull it off...or not. Why could it not have been done at night? Or in inclement weather? The devastation would have been the same, but there wouldn't be all of the video and pictures to spark conspiracy controversies later.
On the other hand, a determined band of terrorists would need a nice, clear day to do this thing.
What I'm trying to point out, is just the logic of the event. If it was meant as a 'clandestine' false flag Op, why in full daylight on a beautiful day? Psychological effect? Why is that worth the risks of being found out?
What else I am trying to point out is that misinfo about how airplanes actually work, and how they're operated, gets onto the internet, and it needs to be corrected with facts.
Thanks, WW
Originally posted by weedwhacker
reply to post by qwertz
...
If it in any way turns out to be an 'inside job' then there are no words to describe the disgust it would enable. There would likely be no need to prosecute those involved, they would be lynched.
Originally posted by weedwhacker
reply to post by Jeff Riff
Jeff Riff, good finds re: flying in IFR conditions....EXCEPT, it was CAVU that day.
Remember, I live in the DC area now, as I did on September 11, 2001. I KNOW what the weather was like that day, and talking about flying on instruments is not pertinent when there was no weather to restrict visibility at all.