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This means that 9:37:44 was the last, complete frame, gathered by the recorder. That puts the likely time of impact in the 9:37:45-6 range, and possibly even into the 9:37:46-7 timeframe. The presence of 9:37:46 in this data suggests that its timestamp may have made it onto the tape. How is that possible if 9:37:45 is not a complete frame? That’s a good question, but a reasonable hypothesis has to do with the storage mechanism used. Solid State Recorders, like all medium, are quite unpredictable if they fail during write operations. The actual area being used to record data can very easily be corrupted if power fails while writing. It’s plausible that the crash caused problems in and around this local area of data, causing corruption of the 9:37:45 data frame (again, changing a single bit in a synch word is enough to cause software to completely choke).
The moral of the story here is that the FDR data runs out anywhere from up to 2 seconds before the plane actually crashed into the Pentagon.
Summary
1) The FDR did not record the final moments of Flight 77. There is up to 2 seconds missing.
2) The CSV file is not meant to be analyzed forensically, it is meant to be plotted.
3) The CSV data is not raw FDR data. It is not even serial bitstream data.
4) The CSV data is not meant to be broken down into 1/8th seconds and analyzed.
5) The CSV data, properly interpreted, says that there are N samples during this particular frame.
6) Without the frame description, we do not know when in a frame any one sample occurred.
7) Without the frame description, we have lost the measurement timestamps, so the time a particular word was recorded does not necessarily equate with when it was measured.
8) Given these time-shift errors, any mathematics that uses more than one data-point runs the risk of assuming that two numbers occurred at the same time, when they didn’t.
9) Many of these errors can be corrected, greatly, with the frame descriptor.
10) Any analysis must account for (or justify ignoring) these issues in order to draw any valid conclusions.
Originally posted by weedwhacker
reply to post by Lillydale
"Lilly", just so I can clear up a few things.....
It is not based on data;
IF HE MEANS it wasn't based on the EXACT data from the American Airlines 77 SSFDR...WHO CARES???!!!???????
Originally posted by theonlyrusty
Very educational thread.
I am not, nor do I care to be, an airline pilot, so some "airline jargon" is beyond my understanding, but............
Could someone explain to me the significance of why they picked the Pentagon to crash a plane into? These terrorists go to all the trouble to devise this plan from their caves, and then they pick the Pentagon? I, personally would have targeted the whitehouse and a football stadium and a nascar race...maybe even a large college or a Pga Golf tournament....I mean, if you want the most bang for your buc, why hit something that is so well fortified?
"Let's hit the Pentagon. Not very many people will get hurt and it will send the message that______________________________?
Someone please fill in the blank for me.
I know this post probably won't get any response....none of mine do since I don't know how to star and flag stuff....
whatever....
Originally posted by hooper
As for why - as they said during the cold war - it is basically shaped like a target and quite easily distinguished from the air. The capital building, the white house and other federal building downtown in DC not so much so. Look at aerial photos in Google.
Originally posted by Lillydale
Originally posted by hooper
As for why - as they said during the cold war - it is basically shaped like a target and quite easily distinguished from the air. The capital building, the white house and other federal building downtown in DC not so much so. Look at aerial photos in Google.
So you are saying that because other buildings may be more important, they purposely designed the pentagon to look like a target from the sky? Why would they not just make that one as difficult as the others????
Do you own or have you ever used a firearm? When shooting at a target, is the best angle to get right up next to the target and shoot sideways at it or to shoot dead on?
....or are you claiming that one wall was what made such an easy to spot and easy to hit target?
The buildings they hit were not the "best" landmarks nor were they easy to get to.
What I was trying to get at was the motivation that caused them to pick the buildings they did.
I seriously doubt that these buildings stood out on the top of their list.
...an oil refinery...
... jefferson memorial...
.... a large gathering of people, a childrens hospital...
... or an airport...
Say you are planning an airline terrorist attack on Britain. Can you tell me the buildings that have the most significance?
How do you discriminate what building is in fact an important one to hit?
...how is a bunch of cave dwelling goat herders just happened to pick the buildings they did?
Originally posted by Lillydale
reply to post by weedwhacker
So weedwacker, just out of curiosity - who have you cleared your identity with here? You claim to be a pilot and you claim to have proven it and yet everyone else that claims to be a pilot has contradicted you so far. Why is it that you do not sound like a real pilot and other real pilots do not agree with anything you have said. Where are your credentials?
Originally posted by theonlyrusty
The men that planned all this were not from our country/culture and would have to have had done ALOT of research for those particular buildings to have any significance to THEM.
If you are capable of by passing all the safeguards the US has in place to keep such events from happening, I would imagine that once you had the plane in the air, you pretty much could turn anything into an easy target.
How hard can it be to hit a building with a plane?
Tell me all the important buildings in Rome. Try Morocco. Now Buenos Aires. Tokyo.
Would you feel different about 911 if they had wiped out 150,000 at a Nascar race? Would this have made it more or less significant?
I would imagine that once you had the plane in the air, you pretty much could turn anything into an easy target.
How hard can it be to hit a building with a plane?
Originally posted by weedwhacker
Would you feel different about 911 if they had wiped out 150,000 at a Nascar race? Would this have made it more or less significant?
Oh, don't get me started!! [pun]
I really a) don't think that a NASCAR 'hit' would kill 150,000 people...and, b) this is going to get me in trouble, but...Who would miss them???
[dodging flaming arrows and ladles of backyard whiskey....]
posted by hooper
I don't know why the pilot choose the path that he did, and never will for sure. Now, what I suspect is that two alternatives were considered. An approach from above and the approach he did take. I think both would have been equally as damaging. I am not a commercial pilot or any kind of a pilot and do not pretend to be. I think the approach he took had a greater possibilty for success. Once the aircraft is level near the ground and pointed in the right direction then it is only a matter of keeping it on course. And I am sure he didn't care what side of the Pentagon he hit. As for diving into the top of the building I would think that once you establish the dive and find that you may overshoot your target it would be much more difficult to correct.