Flyjack wrote: "The Cooper vane would not cancel the Alternate Emergency Airstairs release..."
Please explain further. The vane is a physical block. Unless the emergency system could rip the vane off, how could the vane not stop any and every type of stair deployment?
The DC 9-21 I jumped from in 2006 had a working Cooper Vane but since we had removed the stairs the vane didn't block anything.
Hominid is Mr. Stairs. He knows the 727 door and stair systems really well.
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Applying Alternate Emergency Airstairs system breaks the mechanical mechanism to allow the stairs to just fall loose, having the vane hold the stairs up in an emergency crash situation would render them useless as an emergency system.
I don't really know how the limited number of 727's with both main and Alternate Emergency Systems were equipped with the Cooper Vane, but I just find it interesting that DBC might have halted the future use of the Alt Emergency system. If the Cooper vane stopped the Emergency System it wouldn't function as an Emergency System. Since that system is never publicly mentioned I assume it was intentional to keep it quiet. Perhaps the Cooper vane wasn't used on every 727? I don't know, I haven't looked deep into it as it is not really relevant to NORJAK.
All post Cooper 727s and DC 9s had the Cooper vane installed unless their operators took other more permanent measures to eliminate the possibility of an airborne exit. In a ground exit the Cooper vane is no problem as it needs significant airspeed to rotate into a stair drop blocking position. With zero airspeed it has no blocking effect. You are not allowed to view links.
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I still don't see how the emergency extension system would by pass the Cooper vane in flight.
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I see your point now,
That wasn't really what I meant, and not the point, granted poorly worded in haste and retrospect. I meant that the addition of the Cooper Vane should not diminish the purpose of any emergency release system, but here it "would". The emergency release ceases to be a real emergency release. In an accident they could be held back by a damaged Cooper Vane, clearly the opposite to what I had literally written.
I should have said..
"The Cooper vane should not cancel the Alternate Emergency Airstairs release"
The Cooper Vane is somewhat incompatible and diminishes the utility and the purpose of the alternate emergency system. Perhaps why its use was limited. However, this is completely irrelevant to solving DBC case.
This is relevant,
The "authorities" had motive(s) to keep DBC's use of the Alternate Emergency System quiet both for copycat's and to have info that only DBC knew which is likely why it was never mentioned. Conversely, there has never been an explanation of DBC using the main system, because he initially failed to activate it.
Robert99, if you still have a problem with my idea that DBC tried the Alternate Emergency System take it up with "Hominid" I recently found out he has the same opinion. Or is it just that you need to attack me personally. I figured it out through researching docs (some posted), "Hominid" seems to have reached that conclusion through personal experience.
Unless already found and unidentified/unreported,
that small detachable Alternate Emergency Release access door should still be out there in the woods near the placard location.
"In the nine week period from March to early May, 1972, and again in June and July, 1972, more hijackings occurred, most of them extortion attempts. The FAA responded in June by proposing that aircraft with ventral or tail cone exits be modified so that the exits could not be opened in flight. This proposal was not approved until November and compliance was not required before August, 1973. However, by August, 1972, extortion hijackings had abated. Apparently nothing fails like failure, and in extortion hijackings, everyone, with one possible exception, had failed."
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