General Category > DB Cooper
Clues, Documents And Evidence About The Case
Chaucer:
Thanks, R99.
The problem I am running into is that "pressure oscillations" and "pressure fluctuations" are not commonly used aviation terms. Also, the description given by the crew of these terms don't seem to make sense. Were they only detected on the instruments? Or were they physically felt?
I imagine them being the same sensation as driving with only one back window down in your car.
Robert99:
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Register or LoginThanks, R99.
The problem I am running into is that "pressure oscillations" and "pressure fluctuations" are not commonly used aviation terms. Also, the description given by the crew of these terms don't seem to make sense. Were they only detected on the instruments? Or were they physically felt?
I imagine them being the same sensation as driving with only one back window down in your car.
--- End quote ---
I would not describe the terms you mention as "not commonly used aviation terms". I think Anderson noted pressure fluctuations on the cabin altitude gage on the Flight Engineer's panel.
And I think the stairs slamming into the fuselage was sufficient to cause a physical reaction of the crew. Rataczak reportedly said that it was sufficient to dislodge his radio headset.
Chaucer:
A google search of “pressure fluctuations” and “aviation” will bring up almost no relevant information. A search for the term pressure oscillations will produce next to nothing.
My point is that the sensation that the crew experienced aboard 305 that night is not commonly described in the literature.
JAG:
You are not allowed to view links.
Register or LoginThanks, R99.
The problem I am running into is that "pressure oscillations" and "pressure fluctuations" are not commonly used aviation terms. Also, the description given by the crew of these terms don't seem to make sense. Were they only detected on the instruments? Or were they physically felt?
I imagine them being the same sensation as driving with only one back window down in your car.
--- End quote ---
While I can't quite find the reference at the moment, I believe it has been discussed on this forum that the crew reported feeling the nose of the plane dip slightly around the time of the pressure bump. I suppose it's open to interpretation whether it was related to the bump or not.
Robert99:
You are not allowed to view links.
Register or LoginYou are not allowed to view links.
Register or LoginThanks, R99.
The problem I am running into is that "pressure oscillations" and "pressure fluctuations" are not commonly used aviation terms. Also, the description given by the crew of these terms don't seem to make sense. Were they only detected on the instruments? Or were they physically felt?
I imagine them being the same sensation as driving with only one back window down in your car.
--- End quote ---
While I can't quite find the reference at the moment, I believe it has been discussed on this forum that the crew reported feeling the nose of the plane dip slightly around the time of the pressure bump. I suppose it's open to interpretation whether it was related to the bump or not.
--- End quote ---
The stairs going down would result in a nose down moment which would have to be corrected by the pilot, if hand flying the aircraft, or by the autopilot if it was flying the aircraft. The stairs would go down when Cooper was on them and slam back up when he jumped.
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