Sheremetyevo Superjet 100 in flames
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I am not an aviation professional so grateful if someone could explain things to me:
If the theory of lightning strike are true, how does it lead to electrical failure ? I thought that an aircraft aluminium or metal mesh composite effectively created an Faraday cage ?
If there were local electrical transients, would this only trip circuit breakers. which presumably could be reset quickly ?
Thank you.
If the theory of lightning strike are true, how does it lead to electrical failure ? I thought that an aircraft aluminium or metal mesh composite effectively created an Faraday cage ?
If there were local electrical transients, would this only trip circuit breakers. which presumably could be reset quickly ?
Thank you.
§25.1316 Electrical and electronic system lightning protection.
(a) Each electrical and electronic system that performs a function, for which failure would prevent the continued safe flight and landing of the airplane, must be designed and installed so that—(1) The function is not adversely affected during and after the time the airplane is exposed to lightning; and(2) The system automatically recovers normal operation of that function in a timely manner after the airplane is exposed to lightning.(b) Each electrical and electronic system that performs a function, for which failure would reduce the capability of the airplane or the ability of the flightcrew to respond to an adverse operating condition, must be designed and installed so that the function recovers normal operation in a timely manner after the airplane is exposed to lightning.
There is a lengthy Advisory Circular that provides specifics on how to show compliance.
In short, critical systems can not be significantly affected by the lightning transient, essential systems can be affected but must self recover (with no resetting of circuit breakers). The allowable recovery time depends on the system, but 10 seconds was a good rule of thumb.
So the short answer is that a lightning strike should NOT have resulted in widespread system failures.
Hard to make any further judgment until we know what controlability issues the crew had to tackle. It could be a badly blotched landing with a perfectly controllable airplane, or an outstanding feat of airmanship in face of adverse circumstances.
Last edited by andrasz; 6th May 2019 at 09:13.
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Terrifying footage from inside the cabin here - https://www.youtube.com/watch?v=KwTpGLKPFXI&feature=youtu.be
Full uncut video of the first 5 minutes:
00:20 Aircraft comes to a stop
00:30 First slide deploys
01:51 First Fire truck arrives
02:13 Last evacuation on slide
02:50 RH cockpit crew evacuates using rope
03:30 Crew member climbs back to plane on slide
03:47 Smaller and larger dark objects slide down slide
03:55 Crew member slides down slide
00:20 Aircraft comes to a stop
00:30 First slide deploys
01:51 First Fire truck arrives
02:13 Last evacuation on slide
02:50 RH cockpit crew evacuates using rope
03:30 Crew member climbs back to plane on slide
03:47 Smaller and larger dark objects slide down slide
03:55 Crew member slides down slide
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I am not an aviation professional so grateful if someone could explain things to me:
If the theory of lightning strike are true, how does it lead to electrical failure ? I thought that an aircraft aluminium or metal mesh composite effectively created an Faraday cage ?
If there were local electrical transients, would this only trip circuit breakers. which presumably could be reset quickly ?
Thank you.
If the theory of lightning strike are true, how does it lead to electrical failure ? I thought that an aircraft aluminium or metal mesh composite effectively created an Faraday cage ?
If there were local electrical transients, would this only trip circuit breakers. which presumably could be reset quickly ?
Thank you.
It appears that after that last crew member slides back down at 03:55, there is still someone in the doorway who goes back inside. I don't see them come out, unless they use the slide on the other side. On watching again, it looks like that last crew member then runs around to check the slide on the other side, but no luck.
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Full investigation of all AC losses
This crash is too similar to the last one in 2018 with MLG collapse. And the first AC loss due to CFIT also had electrical failure, hadn't it? It's time for a full investigation of SSJ accidents. This AC is a menace to society. Poor families that lost their members. Rest in peace.
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If its in direct law then likely a handful, and we don't know exactly what systems that were down or why, so lets not rush to judgement on flying skills or otherwise.
What is truly sad is the mis-reporting, the video evidence clearly shows it wasn't on-fire on approach, and its a consequence of the bounce causing a puncture/rupture of the wing fuel tanks.
Reports here now that 41 fatalities.. sad indeed.
What is truly sad is the mis-reporting, the video evidence clearly shows it wasn't on-fire on approach, and its a consequence of the bounce causing a puncture/rupture of the wing fuel tanks.
Reports here now that 41 fatalities.. sad indeed.
When I see the people running with their large luggage, it makes me furious. How many more could have been saved if it wasn't for some selfish morons, we will never know.
Apparently they had lost COMs, so I am guessing the reasons the fire services was so slow was that there had not been any communication from the aircraft as they came in for landing.
Does anybody know what the fire service rescue reaction time should be at an airport like this? Or what level of RFFS it is at this airport?
Someone should have spotted that burning aircraft on approach and raised some alarms you would have thought.
Apparently they had lost COMs, so I am guessing the reasons the fire services was so slow was that there had not been any communication from the aircraft as they came in for landing.
Does anybody know what the fire service rescue reaction time should be at an airport like this? Or what level of RFFS it is at this airport?
Someone should have spotted that burning aircraft on approach and raised some alarms you would have thought.
The landing may have been hard enough to break off the gear and the dislodged gear which rupture the fuel tanks. The videos so far posted show only the latter part of the landing slide out.
The first issue is why the hard landing and then to work the before and afters from that.
The first issue is why the hard landing and then to work the before and afters from that.
