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Old 8th Jan 2018, 18:00   #21 (permalink)
 
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According to a German Newspaper ("Die Welt"), a finnish newspaper („Ilta-Sanomat“) has reported that three persons were IN the aircraft and an attempt to open the door has not been successful and then the door blew open. Parts have been found 10 meters away. That suggests the APU on and pressurization on the ground to me...
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Old 8th Jan 2018, 19:03   #22 (permalink)
 
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Quote:
Originally Posted by kaaremi View Post
when the door of the Gulfstream G-150 jet opened as he was approaching it
It's not entirely clear from reports whether the door was opened from the inside or the pilot himself was opening it when it struck him.

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Old 8th Jan 2018, 22:23   #23 (permalink)
 
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Quote:
Originally Posted by His dudeness View Post
According to a German Newspaper ("Die Welt"), a finnish newspaper („Ilta-Sanomat“) has reported that three persons were IN the aircraft and an attempt to open the door has not been successful and then the door blew open. Parts have been found 10 meters away. That suggests the APU on and pressurization on the ground to me...
Yes if it blew right out could be pressurised cabin, bad way to go though.
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Old 11th Jan 2018, 17:55   #24 (permalink)
 
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With regards to abnormal pressurization on the ground in freezing conditions:

I'm not familiar with the G150 or it's pressurization system however on aircraft which rely on an ejector to provide the vacuum to open the outflow valves (as they should be on the ground prior to applying takeoff power) , if moisture happens to be present in the service air system supplying the ejector and is allowed to freeze this can potentially reduce or prevent vacuum production. This in turn allows the outflow valves to close and subsequently, assuming doors/windows are shut, pressurize the cabin with little or no control. Something to be certainly cautious of in cold weather OPS.
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Old 12th Jan 2018, 20:18   #25 (permalink)
 
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I don't know the dimensions of that door, but assuming it's about 36"x50", that makes it 1800 square inches, which translates to 1800 lbs at 1 psid, and 3600lbs at 2 psid and so on. With that kind of violence, and being projected some 10 meters away, it had to weigh quite a bit.
As an example, some 30 years ago, I had depressurized a Challenger; the pressure diff. gauge read 0. The FSR on board told me to pull the handle up to open the door (we're inside). The door opened with a force that caused the skin to buckle; it bounced up about 4 feet; it required 30 hrs of repairs. I doubt anyone would have survived being hit by that force, let alone at higher psid. The door was probably closed but not locked, since the crew was still outside. And if it was locked, you could not open it with the handle; ; the weigh on the "lock plates" would be way too high; the Challenger door didn't detach nor flew away like this one, so I suggest it was only closed with the locks partially engaged possibly.
Most doors require 2 actions: one to close and one to lock it.
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Old 13th Jan 2018, 15:05   #26 (permalink)
 
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wrench
The door didn't detach, see the picture.
"Parts have been found 10 meters away".
However, as you say, there is a lot of area there.
Very sad.
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Old 16th Jan 2018, 09:20   #27 (permalink)
 
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The Finnish Safety Investigation Authority reported that excessive pressure had accumulated in the cabin, causing the door to open abruptly. Now, the investigation focuses on why the pressure release valve was not in operation and how the crew had been instructed in this regard.

The investigation continues and the final report is expected in 6-12 months.
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Old 19th Jan 2018, 15:10   #28 (permalink)


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Please share Preliminary Investigation report. Thanks.
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