General Category > DB Cooper

General Questions About The Case

<< < (659/677) > >>

dudeman17:
You are not allowed to view links. Register or LoginYou can see what looks to be a guy geared up hanging off the stairs. I don't I understand why they couldn't take N467US to Skylark Airport in Lake Elsinore or Perris Valley Airport in Ca. and take a load up. There would of been a line around the DZ!

--- End quote ---

You're certainly right about all of that!

I'm surprised to see the guy at the bottom of the stairs. Forgive me for not knowing this, but didn't they do that test out over the ocean? I wonder if they had a contingency for recovering him if he happened to fall off.

73blazer:
Mabey this has been answered somewhere but I just don't find it.
If the airstairs are hydraulically operated then why would they bounce back up to create the Rataczak pressure bump? I can't find specifics on the 727 airstairs hydraulics, but information available says they are pushed down and drawn back up by two hydraulic cylinders. I operate all kinds of hydraulic equipment and while you can move some without the actual hydraulic pressure being applied it will move very very slowly. I'm just wondering about the whole "bounce" back of the airstairs if that's even possible.   

Shutter:
Three systems are on the 727.. system A-B and a standby system. all are tied together. system A mostly does the flight controls, system B controls the main brakes and aftstairs..I believe they operate at 3000 psi..

The stairs didn't "slam shut" they came up rather slowly due to fighting the hydraulic system. this can be seen in the movie "The Pursuit Of DB Cooper"  flight 305 was going about 20 knots faster so the stairs might of retracted a little faster but no much IMO. even coming up slowly would cause disruption that would register on the control panel.

73blazer:
So the 727 has the std (well ahead of its time really) three hydraulic circuits. That's fine. But the air stairs are hydraulically operated and I'd love to see the hydraulic circuits that control them on paper surely that has to exist somewhere. . I guess i was never convinced this pressure bump was the actual time of departure as I really don't think these stairs can come back up with any force as to produce any noticeable reading by the cockpit or anyone else. They supposedly reproduced this event shortly after is there written recorded evidence to this effect?  I dunno...just asking questions......

Shutter:
The aircraft is air-tight so any disruption will show on the gauge. the stairs almost closed once he left the stairs. the wind load on the stairs was extreme and kept the stairs almost closed until his weight was applied lowering them further putting a greater load on the stairs.

System A was powered by the engines, not sure which one and system B was AC powered, along with the standby system. YouTube has some video on the hydraulics..

Navigation

[0] Message Index

[#] Next page

[*] Previous page