Carried on board or pre placed there by "aircrew"?
Think gun in the bathroom scene in The Godfather.
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Russian passenger plane crashes in the Sinai
- Thread starter T.Lex
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Carried on board or pre placed there by "aircrew"?
Think gun in the bathroom scene in The Godfather.
Actually, from the BBC:
Russia plane crash: IS publishes 'improvised bomb' photo - BBC News
The switch has 2 LEDs on it, and presumably a battery in the taped up portion. The switch might simply arm it and power a pressure sensor. It could've been anywhere. But, I'd still guess that it was in carry-on or placed in an overhead bin by an airport worker. Put it and a sandwich and some chips in a brown paper bag and no one would think twice about it.
I dont even think it has to be well placed. I believe it would just have to inside a pressurized part of the plane. I took a forensic science class in college and we talked about explosives in planes when one of the guest speakers showed up, and from what I remember, a very small amount of explosives could cause catastrophic damage when the plane was pressurized.
But then again.... I might be remembering wrong
Well, from the little I've followed that, it depends on a bunch of factors. I remember in the late 80s/early 90s, there was a jet (to Hawaii, IIRC) that had part of the roof rip off. A stewardess died, but the plane landed.
Other depressurizations can be catastrophic or not.
Actually, I go back to the time of the radar signals. I wonder if it was a timer under the switch. Maybe just the face of a watch or something. The explosion appeared to be on the hour. They could pretty easily figure out how long it would take to get to altitude, add a buffer, then round up to the nearest quarter hour.
Other depressurizations can be catastrophic or not.
Actually, I go back to the time of the radar signals. I wonder if it was a timer under the switch. Maybe just the face of a watch or something. The explosion appeared to be on the hour. They could pretty easily figure out how long it would take to get to altitude, add a buffer, then round up to the nearest quarter hour.
jblomenberg16
Grandmaster
Could very well be. A few things strike me though.
1) A typically pressure sensor has a relatively linear output of voltage vs. pressure, so it would take some additional circuitry to get it to "trigger" since there isn't usually a binary on / off behavior of such a sensor.
2) I need to do a little more digging, but I don't think that a small 9V battery is enough to ignite a typical electric blasting cap reliably. Yes, they are VERY sensitive to static electricity so when using normally there is great care to prevent an accidental ignition due to stray current. I just don't know if 9v or smaller is enough to actually get one to ignite.
I do think the can and cap are pretty good bets, and from there the actual trigger mechanism is probably the easy part.
Blowing up the picture (sorry) it doesn't look like a 9V battery. The edging is rounded. They make a 12v pile cell battery, 2 of these in series would give 24v.
jblomenberg16
Grandmaster
That'd do it. You only need a couple amp-seconds.
I guess so. The more I thought of it, I guess the electric match in the cap is really a heavier duty version of the igniter used for model rocket engines.
jblomenberg16
Grandmaster
Stuck with a news search and looked for the jpost. 
Catering loads cases of pop on board. Just one can among many. A popcan sized lump of Semtex detonated in forward or aft galley would impact critical systems
What about the thyristor circuitry and capacitor from a camera flash? Charges at the voltage under discussion and delivers a high amperage pulse.
So... this is interesting.
Everyone figured out a bomb brought down the Metrojet. Russia finally said a bomb brought down the Metrojet. The downing of the jet led, in part, to Russia's escalation against Daesh.
But wait...
Egypt: Sinai crash probe finds 'no proof of terrorism' - BBC News
Now, Egypt certainly has motive to downplay terrorism, in part because their tourism industry took a real hit. But, "no proof" is a strong statement. Especially when it runs counter to what everyone else is saying. If it is for domestic consumption, then who are they trying to convince?
Everyone figured out a bomb brought down the Metrojet. Russia finally said a bomb brought down the Metrojet. The downing of the jet led, in part, to Russia's escalation against Daesh.
But wait...
Egypt: Sinai crash probe finds 'no proof of terrorism' - BBC News
Now, Egypt certainly has motive to downplay terrorism, in part because their tourism industry took a real hit. But, "no proof" is a strong statement. Especially when it runs counter to what everyone else is saying. If it is for domestic consumption, then who are they trying to convince?
