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Metrojet crash Eygpt

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Metrojet crash Eygpt

Old 17th Nov 2015, 11:48
  #21 (permalink)  
 
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Egypt authorities suspend 17 people from airport staff, two of them are suspected of helping person who placed bomb.
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Old 17th Nov 2015, 11:58
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A0283

seems the area of interest of the bomb going off was a hole found under the keel near the tail

a bomb/IED of 1kg TNT so the RT news says

that maybe explains seeing no cargo hold area or cargo doors or floor back from the wing box

assume bulk loading of the bags and no ULD's used on this airline?

remember this A321 had a planned 12 layover at SSH unattended for the most part
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Old 17th Nov 2015, 12:44
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How difficult is a barometric-pressure device as trigger?

PS Egypt seems to be denying any airport staff was arrested....?
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Old 17th Nov 2015, 12:52
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Originally Posted by rog747 View Post
seems the area of interest of the bomb going off was a hole found under the keel near the tail
How interesting - that is exactly where the Waste Tank is situated in what, I believe, is a relatively inaccessible compartment.
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Old 17th Nov 2015, 12:55
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Barometric Trigger

Very very easy. Just think of two wires that are pressed together by an expanding balloon. It would take an average school kid about 30 minutes of labour to design accurately.
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Old 17th Nov 2015, 12:58
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Quote:
"How difficult is a barometric-pressure device as trigger?"

'Safest' would be a barometric-pressure trigger that starts a timer. Pressure altitude was reached earlier in the flight if device was placed in cargo-hold.
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Old 17th Nov 2015, 12:58
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Changes to come??

http://www.pprune.org/9177010-post2084.html


A0283 -two unexpected ones ( bomb hiding places)
Control eng - waste tank not easily accessible compartment

if by tail section they mean APU or HS (or one of the two suggests above) it really does question airport security if someone opened a "maintenance panel" to place a bomb.

Of course my original post concerned doors/hatches only if the industry now has o consider securing maintenance panels/hatches what a nightmare.

Last edited by oldoberon; 17th Nov 2015 at 13:12. Reason: add text edit 2 add para maintenance panels
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Old 17th Nov 2015, 13:13
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The modern mobile phone has a barometer, GPS, accelerometers, microphones, timer, radio links, a huge amount of computing power, and a massive support ecosystem of development tools and optional hardware. It's also an everyday item and possession is entirely unremarkable. You can develop the software anywhere in the world and deploy it anywhere else on demand.

You couldn't hope for a better platform to design an efficient and flexible bomb trigger mechanism, all for a couple of hundred dollars and accessible to people with hobbyist-level skills.

That engineering problem has been solved.

I don't know, of course, whether this is what was used; a cheap wristwatch is still a sensible alternative. But this is what I suspect.
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Old 17th Nov 2015, 13:36
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Would the proposed placement also explain the immediate cutoff of FDR data?
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Old 17th Nov 2015, 13:53
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The modern mobile phone has a barometer, GPS, accelerometers, microphones, timer, radio links, a huge amount of computing power, and a massive support ecosystem of development tools and optional hardware. It's also an everyday item and possession is entirely unremarkable. You can develop the software anywhere in the world and deploy it anywhere else on demand.

You couldn't hope for a better platform to design an efficient and flexible bomb trigger mechanism, all for a couple of hundred dollars and accessible to people with hobbyist-level skills.
At the same time, modern phone lacks any suitable interface to actually wire it up to the detonator, and the creative modifications required to do it are not exactly hobbyist-level; more so, the modified phone will no longer be "entirely unremarkable" - unless one manages to conceal the entire explosive device within the phone's casing. I defer to demolition experts on whether it is doable.

I agree that It is a possibility, but from an pure engineering standpoint of view, my humble opinion is that using a smartphone as a detonation trigger seems to be too complicated and potentially unreliable way, while, obviously, there are much simpler ways to achieve the same effect, like the $1 wristwatch that you have mentioned.
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Old 17th Nov 2015, 14:05
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It appears all suggestions of "HS jackscrew failure" branch of PPRuNe armchair investigation was wrong
wait, will be followed by the ...'balistics expert' team
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Old 17th Nov 2015, 14:17
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Russia seems to be serious re Bomb

For a second straight day French warplanes hit a command post and a recruitment center for jihadists in an Islamic State stronghold, Raqqa, the French Ministry of Defense announced on its website, while Russian news reports said a Russian submarine had fired cruise missiles at Islamic State targets in the same area.
Russia struck Raqqa with advanced Kalibr cruise missiles launched from a submarine in the eastern Mediterranean, the RBC news agency reported, citing sources in the Russian Defense Ministry. The agency said it was the first time Russia had fired cruise missiles from a submarine during a war.
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Old 17th Nov 2015, 14:24
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screw jack failure

Think the poster meant mechanical failure, would have thought a bomb in apu compartment would have severely disprupted HS and ripped jackscrew to pieces.
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Old 17th Nov 2015, 14:26
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How do you protect your 'mole', if the device is set to trigger while the a/c is still over home territory, leaving evidence right at his doorstep? Doesn't make much sense.
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Old 17th Nov 2015, 15:02
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Originally Posted by Iceheart
At the same time, modern phone lacks any suitable interface to actually wire it up to the detonator, and the creative modifications required to do it are not exactly hobbyist-level; more so, the modified phone will no longer be "entirely unremarkable" - unless one manages to conceal the entire explosive device within the phone's casing. I defer to demolition experts on whether it is doable.
EDIT: It's a trivial job, involving a tenner and ebay.

Last edited by HundredPercentPlease; 17th Nov 2015 at 15:50. Reason: Details removed in case it gives the game away and thus upsets people
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Old 17th Nov 2015, 15:08
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LifeNews published cut from old video with suspected luggage piece.

LifeNews LIFE | NEWS

"In contrary with other luggage, this one seems bears burn marks from inside".



UPD: Nevertheless, I still not think it was luggage bomb. My opinion it was planted outside rear pressure bulkhead and it was planted from outside.

Last edited by Kulverstukas; 17th Nov 2015 at 16:09.
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Old 17th Nov 2015, 15:19
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Exactly what is the wisdom in posting about possible trigger mechanisms and explosive devices on a public aviation forum???.......?
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Old 17th Nov 2015, 16:18
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oyviv
There's nothing to worry about with what has been posted here

This is stuff that an industrious middle school kid with a bit of a mechanical aptitude could easily come up with.
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Old 17th Nov 2015, 16:21
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If some people here, not being explosive experts, can imagine such mechanisms, don't you think Daesh have been able too ? They aren't probably (and unfortunately) completely stupid.
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Old 17th Nov 2015, 16:35
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Originally Posted by Kulverstukas View Post
UPD: Nevertheless, I still not think it was luggage bomb. My opinion it was planted outside rear pressure bulkhead and it was planted from outside.
So, in your opinion, what destroyed the fuselage pressure vessel while still in the air?

There is no evidence of the RPB being thrust forwards!
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