I'll have more to say about this later, but I said this on DZ:

There is a difference between the "oscillations" and the "pressure bump". The "oscillations" are like being pregnant and the "pressure bump" is like having a baby. At 8:11 the crew was reporting that the plane was "getting some oscillations in the cabin" (still pregnant). They did not report a pressure bump at that time (just gave birth). They did the same thing at 8:12 (although I'm open to the possibility of a 1 minute delay in the original 8:11 report). The FBI looked at the data and transmissions about "pressure fluctuations" and "oscillations" and incorrectly deduced that that meant that's when Cooper bailed. They looked at the woman who was 8 months pregnant and said "she just had a baby". That's their error and that confusion continues to this day.

We don't know when Cooper jumped, but we know that he had to have jumped AFTER 8:11 and probably after 8:12.

The 8:13 time that is repeated comes from Sonderlind who estimated the jumped time after the crew reported it an unknown time later. It's not official - just an educated guess based on crew statements.

Then you add in the statements from Rat and others about "not being in Portland Proper but in the suburbs and the immediate vicinity" and "seeing the lights of Portland coming up" "but not yet crossed the Columbia yet". That leads me to believe that the jump occurred nearer to the Columbia than originally thought. Proof? No, but strong circumstantial evidence. The FBI would seem to agree since they have moved the drop zone further south as time passed. I think they know they screwed the pooch with the 8:11 jump and ensuing search and adjusted it south - just not enough IMO.

TL;DR:  The assumption that the oscillations and the pressure bump are the same thing is a mistake. Are they connected? Yes, but not the same thing. Like being pregnant vs. giving birth.

T

The 8:13 time that is repeated comes from Sonderlind who estimated the jumped time after the crew reported it an unknown time later. It's not official - just an educated guess based on crew statements.

Paul made the jump maps and calculated 8:11. why would he reference 8:13?

I don't recall him giving a time other than 10-15 minutes vs 5 to 10 said in the past. I believe Eric stated Bill said 8:13 unless I'm mistaken on that?

I think you are wrong or we wold see a map referencing that point? several maps were made. check and see if the time was changed...

I know a reference is made stating the jump could go all the way down to the columbia or the search..

I'm trying to figure out why they stayed with the 8:11 location if the crew believes it was 8:13. I'm not disputing the time the crew states but they appear to go against that?

However, Anderson has said that they delayed in reporting the pressure bump. Also, the 8:12 time is purely a guess. We know it happened after the oscillations but when did the oscillations end? 8:14? 8:14? 8:15? 8:16? We don’t know. The reason the jump time is important to me is because if it’s close to the river then that would begin to offer an explanation for the money on Tena Bar.

But if we verify it happened earlier then that creates even more confusion.

The stairs weren’t opening like Cooper needed. Cooper called me on the interphone while Tina was riding up front with us. Cooper had let Tina come to the front.  He yelled,  "slow it down!."  I stated back to Cooper, "OK."  And we did;  we slowed the plane.

This is from the start of the flight. they leveled off, slowed the plane down and went to 30 degree flaps.

The oscillations continued, as I remember, but were smoother and we hadn’t heard anything from Cooper.

This is also from the start of the flight and appears the oscillation smoothed out. Copper might of been on the first couple steps causing more disruption.

Bill called back to him and he finally answered.  He said everything was “OK”

This is the 8:05 entry.

More time passed. And then suddenly came that “bump”. After the final "bump" which we felt with our ears, we all discussed it for awhile, waiting for another bump.  It never repeated, so we assumed that was his exit.

Here, it appears to show the gap between the 8:05 entry and when Cooper was on the stairs. they describe two events or two bumps. one possibly Cooper on the stairs and the final bump being the door closing....

I went over this last night and checked again with the Harrison notes. apparently, he was monitoring the flight and taking notes.

We have several entries in the log that can be confusing.

The log/teletype reports at 8:22 the plane is at 23 miles DME.
Harrison notes the time at 8:18.

The next entry in the log is 8:52 stating they are over the Eugene VOR and talk about Cooper's last contact 55 minutes ago. that doesn't match the 8:52 entry. Harrison notes it at 9:00 which makes sense for the last contact at 55 minutes.

The problem appears to be the entry recorded has two time frames into one. (8:22 log)
Harrison notes at 8:50 they are over the Eugene VOR
Harrison notes the next entry as 9:00 for the reference to 55 minutes since they contacted Cooper.
The transcripts have them combined.

The distance between the 23 miles DME and the Eugene VOR is approx. 79 NM.
This gives approx. 26.3 minutes of flight.
This gives a time of 8:44

Then you look at the fuel. 4500 per hour x 3 is 13,500
The 8:22 entry shows 40,000 lbs of fuel.
The 8:52 entry shows 33,500 lbs of fuel
They burned 6,500 lbs in 30 minutes. which sounds right.

Harrison times are
8:18 and 8:50 with 32 minutes.
The fuel equals about the same.

We are still missing time. Harrison reports 165 at 8:18 and the transcripts report 170.

What is interesting is that if Harrison is accurate with the 8:18/23 DME stamp, then according to my version of the Western Flight Path--Maylay (not Toledo) direct to Canby--305 would be over Sauvie Island a 1000 feet or so south of Tena Bar at 8:13.

This would mean that DBC jumping at 8:13 and drifting to the NE would land just north of Tena Bar as I have theorized.

An intriguing coincidence to note in my mind.