I had plenty of crash and burns myself learning. here is a video of me trying to land different aircraft with not so good results 

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Good luck on the test drop, Shut.

I have a question that I can’t seem to find an answer to:

Where in the official documentation (302s, radio transmissions, etc.) is the “pressure bump” mentioned? I have found documentation of the “oscillations” which were recorded at 8:1–8:12, but I cannot find anything official regarding documention of the “pressure bump” which is assumed when Cooper jump.

Can anyone point me in the right direction?

Where in the official documentation <> is the “pressure bump” mentioned?

Here are some documents on vault.fbi.gov which include references to the "oscillation", which was the generic term used by Northwest Airlines and the FBI for a transient change in the cabin pressure gauge:

D.B. Cooper Part 08 p017-019
D.B. Cooper Part 10 p421-422
D.B. Cooper Part 11 p092-093
D.B. Cooper Part 13 p013-014
D.B. Cooper Part 17 p009
D.B. Cooper Part 17 p080
D.B. Cooper Part 18 p154
D.B. Cooper Part 41 p021,026,030-032.

The oscillation would come first once the stairs were lowered. the bump would be the stairs retracting back up pushing pressure into the cabin. same happens closing doors in cars and homes. the drapes will jump or pull away from the wall.

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The oscillation would come first once the stairs were lowered. the bump would be the stairs retracting back up pushing pressure into the cabin. same happens closing doors in cars and homes. the drapes will jump or pull away from the wall.

Yes, but in the FBI files, they conflate they two. In fact, there doesn’t appear to be any mention of a “pressure bump”. Just “oscillations”.

So, is the idea of a “pressure bump” just anecdotal?

The "bump" surfaced AFTERWARDS - during the deposing of the crew the next day. The bump was in place and being considered by everyone prior to the test flight. Everyone includes the flight crew, people at NWA, the FBI, test flight people etc. Initially the bump was included in all of the events communicated as 'oscillations'  - the oscillations culminated in a pressure event at the end, termed a "bump". Bump was not anecdotal but an actual series of quickly spaced events after which oscillations ceased! 

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The oscillation would come first once the stairs were lowered. the bump would be the stairs retracting back up pushing pressure into the cabin. same happens closing doors in cars and homes. the drapes will jump or pull away from the wall.

Yes, but in the FBI files, they conflate they two. In fact, there doesn’t appear to be any mention of a “pressure bump”. Just “oscillations”.

So, is the idea of a “pressure bump” just anecdotal?

The "bump" surfaced AFTERWARDS - during the deposing of the crew the next day. The bump was in place and being considered by everyone prior to the test flight. Everyone includes the flight crew, people at NWA, the FBI, test flight people etc. Initially the bump was included in all of the events communicated as 'oscillations'  - the oscillations culminated in a pressure event at the end, termed a "bump". Bump was not anecdotal but an actual series of quickly spaced events after which oscillations ceased!

Thanks, georger.

Still seems odd that the FBI files, despite the depositions, continually refer to the report of “oscillations” to be the time of Cooper’s jump. There’s no mention of a “bump” in the 302s.

This would lead to two conclusions:
1. The pressure bump occurred some point AFTER 8:12 when the oscillations were first reported.

2. The pressure bump and the oscillations were confused by the FBI as the same thing.

No you are not listening. Nobody confused anything. Different things were reported at different times by different people. By the time of the test flight everyone understood the full sequence of events and effects and the order in which they occurred. Try not to jump to conclusions since you dont have the correct history.   

There were oscillations. This ended with a pressure event coupled with an aerodynamic curtsy of the plane later termed "the bump" - people actually felt in their ears along with a change in the rate-climb meter noted by the flight engineer on his panel ...

There is files that mention the pressure bump...one claims the oscillation and bump were very close from what I recall..


Houston, we have a problem. I took the drone up to 100 feet and the drop device failed. I changed the dropbox to cardboard and it apparently still blocks the signal. it was able to drop from about 50 feet when I could see the light on the unit under the drone. both test pieces dropped straight down. video at 100 feet is also an issue. need a good camera. I'm guessing the drop device needs a line of sight to function. it's rated at 400 feet for distance.

That's for pressurizing the plane. all planes need to be pressurized at altitudes higher than 10,000. they noticed the pressure change looking at the gauges as well. 305 was not. that's why he could open the bulkhead door and lower the stairs. if the cabin was pressurized the door wouldn't open.