I have a problem with the "known flight path " statement. I think nobody knows for certain where the flight path actually was 100 %. I'm a Math person and I actually think the location of the flight could be proven thanks to the location of the placard. Lots of variables would have to be taken into consideration like the elevation placard was found, the elevation of airplane, approx wind and direction and of course the exact location where the placard was found. I understand there was a simulation done but I'd like to see a replica of the placard dropped from a plane at the correct height on a day when the wind direction and velocity duplicates the wind on day of jump. I know it sounds complicated but it's simple Math. The drift of placard from drop position would tell you pretty accurately where the airplane was flying when the stairs were lowered. I realize this doesn't prove where the plane crossed the Columbia River but it could easily narrow the path of flt 305.
R99 has tried to address all of these points - its his job!
(said with total affection & respect for R99!)
Georger, did you mean up-stream a couple of posts back?
Kermit, here are some of the problems with determining the actual flight path. The FBI has redacted all information useful to determining the flight path from the Seattle ATC radio transcripts. You should read and compare the Seattle ATC radio transcripts with the transcripts from the SEATAC tower, Oakland ATC, and Reno tower. There are 19 redactions in the Seattle ATC transcript and none whatsoever in the other transcripts from the other three facilities.
I have personally initiated three FOIA requests with the FBI and FAA trying to get the original and complete Seattle ATC transcript. Nothing of any consequence came of these efforts despite two interventions at the Congressional level by my US Representative.
There are any number of reasons for believing that the airliner bypassed Portland on the west side including evidence shown on the so-called "FBI map" (actually, the FBI doesn't know where that map came from), any number of interviews conducted by Georger with people in the Portland area, the flight crew, and many, many other factors.
I would suggest you read the thread on this site where I discussed the flight path problem in great detail.
I have probably had as much training as you in fields related to engineering mathematics. I am also a retired Aeronautical Engineer, retired general aviation and sports aircraft pilot, and have a limited amount of skydiving experience. And I hold the FAA Ground Instructor Ratings for the related aviation fields mentioned above.
Robert99
ADDENDUM: Georger's post just above is correct!
R99