[HN Gopher] Dublin Airport airbrige collapsed, damaging American...
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Dublin Airport airbrige collapsed, damaging American Airlines
Boeing 787
Author : mikequinlan
Score : 65 points
Date : 2023-07-09 13:42 UTC (9 hours ago)
(HTM) web link (aviationa2z.com)
(TXT) w3m dump (aviationa2z.com)
| FL410 wrote:
| That airplane is surely not going anywhere any time soon, but it
| seems we have far different ideas of "severely damaged."
| 13of40 wrote:
| When you're getting on the plane, if you look down and to the
| right there's a little wheel resting against the side of the
| plane and connected to the skybridge. It says do not touch.
| That's because it's the sensor that allows the skybridge to
| automatically level itself when the plane moves up and down on
| its suspension due to fueling, loading, unloading, etc. I wonder
| if this is what happens if it gets touched?
| supernova87a wrote:
| I would hope / imagine that the amount of force necessary to
| move that wheel is well greater than what an average person
| could exert without being noticed and stopped by one of the
| crew! (i.e. only genuinely large movements of the 2 very heavy
| objects involved)
| collinc777 wrote:
| Sometimes it doesn't have the warning and I think it should be
| mandatory. Any passenger can go and play with the wheel and
| wreck havoc.
| mbreese wrote:
| I always figured it was a pinching hazard.
| mechhacker wrote:
| If you look down you also see how far away the ground is.
|
| Always find myself subconsciously wondering how to react if the
| bridge/plane somehow separate.
| pmontra wrote:
| Jump forward, either into the plane or into the bridge, or
| rest on the back foot? I think that either we train reflexes
| or our body will take a guess but who trains for that?
| brookst wrote:
| I hate the moment of having one foot on plane, one on bridge.
| yakubin wrote:
| Jump with both feet.
| HKH2 wrote:
| Then you probably won't enjoy watching video footage of
| elevator failures.
| bombcar wrote:
| Ride either of them down, preferably the plane. Don't fall
| out!
| zootboy wrote:
| Judging from the photos, not unless "touched" means "was pulled
| back and rolled about 7 turns downward".
| hlandau wrote:
| Another design to accomplish this same goal seems to be called
| the "safety shoe" [1]. I believe this is a horizontal bar
| placed under the open door which moves the airbridge down if it
| gets too close.
|
| https://www.youtube.com/watch?v=4Ir5b0GzfiE
| supernova87a wrote:
| I've wondered what that is when seeing it during boarding!
| The video doesn't explain anything though... Is it some
| proximity sensor? How? It doesn't seem to require extremely
| accurate positioning.
| jffry wrote:
| I found a product manual [1] from one manufacturer which
| describes stepping on it as part of a maintenance test
| (bottom of page 6), so it seems like some type of switch or
| pressure.
|
| The idea seems to be that if the door touches the top of
| the sensor, it automatically lowers the jetbridge a few
| inches to prevent the door from being damaged. And I guess
| this can happen if the plane is being loaded improperly
| causing it to shift.
|
| [1] PDF, 4MB: https://www.acesincusa.com/wp-
| content/uploads/2020/07/Safety...
| supernova87a wrote:
| Oh, I see, thanks for that! Yes it looks like a contact
| strip sensor kind of thing.
|
| I have also noticed in some jet bridges, you will see
| some kind of air sensor probe on the end of a coiled
| cord, which is very odd to me that this would inform the
| operation of the bridge. I can't find a photo of it
| readily, but it is definitely something I have noticed
| and puzzled about.
| johnwalkr wrote:
| The wheel is the primary sensor and the safety shoe is a
| backup.
| turrican wrote:
| I work in aviation and have moved that wheel out of curiosity.
| As expected, the jet bridge moved up and down with the wheel!
| dehrmann wrote:
| Aren't those reachable by boarding passengers? Never put
| anything sensitive like that near passengers. With millions of
| passengers, including kids, walking by it each day, _someone_
| is going to touch it for fun, especially when you put up a sign
| saying "touch me!"
| netsharc wrote:
| This tech is on thousands of bridges around the world, has
| been for a lot of years now, and yes, millions of people have
| passed it, and we haven't heard of any incidents of
| passengers touching it and causing big issues... so I would
| say whoever engineered it knew what they were doing and don't
| need the Internet commenter expert knowledge...
| gamesbrainiac wrote:
| I went to Ireland just last month, and I have to say that the
| Airport was significantly better than what it was 2 years ago.
| This news puts a damper on my raised expectations.
| thecosmicfrog wrote:
| One incident lowers your opinion of a busy international
| airport?
| Mystery-Machine wrote:
| Ummmm, yes? How often does such incident happen? Seems like
| not that often. I don't remember ever hearing of such
| incident.
| esharte wrote:
| You likely just went through the newer terminal 2 that time but
| it's been open 13 years already.
| Macha wrote:
| Also depends how exact 2 years ago is. From the beginning of
| covid until a few months ago it was quite understaffed as
| they didn't bother keeping staff training/certifications up
| to date as they didn't expect demand to pick up so quickly as
| it has.
|
| I have to say that pre-covid, Dublin airport has been one of
| the better airports in my experience. Security was among the
| fastest of airports I've been in, decent variety of shops
| behind it, flights departing smoothly
| supernova87a wrote:
| The photo has the look of some hydraulics in the support legs
| failing and allowing the end of the bridge to fall.
| raverbashing wrote:
| This sucks but it is not that big of a deal
|
| Jet bridges can fail that way and doors get ripped off exactly to
| not make a bigger mess in that case
|
| Insurance, maintenance, etc are all there for a reason. Plane
| should be back into service soon
| CoastalCoder wrote:
| > This sucks but it is not that big of a deal
|
| Not this time, thankfully.
|
| But it could have severely injured or even killed someone in /
| under the bridge at the time of failure. Especially if they
| were transitioning between the plane and the bridge.
| wongarsu wrote:
| If you stand below without a hardhat (as the people in the
| picture) you might be hit by the falling door or the
| airbridge itself. That might be bad.
|
| For passengers this doesn't look particularly dangerous
| though. From the picture s it look like a 2 meter/6 feet fall
| onto concrete. Unprepared, but feet first. Sure you _can_ die
| from that if you are uncoordinated and somewhat frail (e.g.
| suffering from osteoporosis), but most people would get away
| from that with a couple scratches on their hands and knees.
| CoastalCoder wrote:
| I could be mistaken, but I think the following are also
| possible:
|
| (a) While crossing the threshold, head trauma from the
| bar(s) that support the flexible ceiling of the bridge.
|
| (b) While crossing the threshold, pinned and crushed by
| that bar. I.e., half of their body is inside the plane, the
| other half is holding up the bridge via that bar.
|
| (c) While crossing the threshold, a parent carrying a baby.
| Baby is ripped out of parent's arms, and falls 6-8 feet to
| the ground. Possibly head first.
|
| All are horrifying possibilities, which I don't believe
| would be fully remediated by post-incident insurance or
| maintenance.
| dghlsakjg wrote:
| This is all under the assumption that this was a sudden
| collapse while the jet-bridge was fully loaded with
| people.
|
| If the system just lost hydraulic pressure slowly during
| a non-loading time, its entirely possible that it took
| quite a while to collapse, and no one was near enough to
| do anything. The forces would be high, but there would be
| ample time for a human to move.
| ciabattabread wrote:
| [flagged]
| dghlsakjg wrote:
| All I said was that rapid catastrophic failure is
| necessary for any of the injury mechanisms mentioned.
|
| Why the snarky comment?
| wongarsu wrote:
| I think there's a big difference between asserting that a
| very deadly event should have been less deadly, and
| arguing that an event where nobody was hurt in fact was
| fairly harmless and was unlikely to seriously hurt or
| kill anyone.
| xaminmo wrote:
| They are hydraulic elevators. Failure falls are slow. There
| are exclusion zones under the bridge, and soneone inside
| would have to trip, fall, and hit their head to be at serious
| risk.
|
| Basically, failure modes for aviation related technology
| tries to take into account public risk.
| blantonl wrote:
| A DFW Airport maintenance employee was killed after falling
| from a Jet Bridge back in 2015.
| NooneAtAll3 wrote:
| reminded me of Top Gear scene
| xaminmo wrote:
| That would not happen here since it stayed pressed against
| the fuselage. Falling out of an open jetbridge unexpectedly
| has head injury written all over it. A failing / falling
| jetbridge has hydraulic slow descent vibes.
| tacker2000 wrote:
| This website is as ad-infested as it gets...
| Dalewyn wrote:
| Wouldn't surprise me if the article itself was "AI" generated
| with minimal editing by a non-native English speaker, given the
| very awkward wording, inconsistent terminology, and repetition
| of key facts.
| oefrha wrote:
| "Repetition of key facts" is something AI chatbots and pre-AI
| "journalists" have in common. Gotta write that ten paragraph
| article even though you only have one sentence of actual
| information.
| dawnerd wrote:
| Also what happens when info if only available from one
| tweet but you need paragraphs and multiple embeds.
| Aloha wrote:
| I've been on some mighty rusty unstable feeling jetbridges, I've
| always wondered how often they collapse, and what their nominal
| lifetime is.
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(page generated 2023-07-09 23:02 UTC)