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SFO near miss might have triggered aviation disaster

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Re: SFO near miss might have triggered aviation disaster

#351

Wouldn't the word be "near hit" instead of "near Miss"? If you were close too missing, you'd hit something...

"Near miss" parses as "a miss which was near," not "nearly a miss."

I love George Carlin, bless his soul, but this is one thing he got wrong.

Re: SFO near miss might have triggered aviation disaster

#352

Earlier quoted context omitted.

Seems like a design flaw. Do any taxiways have markings etc. to make them more distinguishable?

They do. They have different lighting systems/colours etc. to differentiate them. Taxiways generally have green lights along the centerline to guide aircraft rolling on the ground, but runways usually have white (bright) lights along the edges . There are times when even THAT causes confusion, because sometimes the taxiway centreline lights can look like the edge lights of the runway - especially if the light is refr…

From the sound of things, this particular disaster hasn't happened before, even though it's conceptually easy to imagine how it could. Is that because it's easy for the controllers on the ground to wave somebody off if they're going the wrong way, or is it really because we're just lucky?

Re: SFO near miss might have triggered aviation disaster

#353

Earlier quoted context omitted.

If there is fog you do not fly by hand. You use an automated landing system (ILS) in that case.

SFO's ILS isn't always functioning. It was turned off for months when Asiana crashed (June 1st - Aug 2nd)[1]. [1] http://www.popularmechanics.com/flight/a9124/what-went-wrong...

I'm pretty sure SFO always has functioning ILS, otherwise the airport would have to close every time there was even mildly bad weather. Each runway has its own system, though, so an individual runway's ILS can be turned off.

If there was fog, they wouldn't have been using 28L.

Re: SFO near miss might have triggered aviation disaster

#354
post #34

People "could" run their cars off of bridges every day, but they don't because they can see, and because roads have signs warning them of curves. This sounds like a story of how well the aviation system works more than anything. The pilot is in constant communication with the tower. The system worked as intended here and he went around. It seems like a non story.

Comment like that would put me off hiring you for any sort of mission- or safety-critical project. The approach for Asiana 214 looked fine until it wasn't; that was less than 4 years ago. Maybe you should stare at the video of that crash for a while and consider the large consequences that can ensue from a small error of judgement made a little too late.

I would say that the approach for Asiana 214 looked bad from the moment it started, as the pilot felt uncomfortable performing a visual approach. Something has gone terribly wrong with training standards if a qualified airline pilot feels uncomfortable performing a visual approach in good weather into an airport with no tricky features.

Asiana wasn't a small error of judgment, it was a fundamental failure of training and over-reliance on automation which resulted in a pilot who didn't really know how to land.

Re: SFO near miss might have triggered aviation disaster

#355
post #48

I am just a passenger, but this looks very over-blown. A pilot aligned with the taxiway, that's bad. But no pilot would ever land on a runway (or taxiway) with 3 planes on it. Just search the Aviation Herald for "runway incursion". And indeed, he spotted them, communicated, went around. Aviation safety margins are so wide that this does not qualify as a near-miss.

I'm a private pilot who has flown into SFO once, and flies over SFO on a regular basis (I'm based at Palo Alto airport). This is not being overblown. If you listen to the audio tape, the tower orders the go-around at the 33 second mark, and United 1 reports that "Air Canada flew directly over us" 16 seconds later. That is a breathtakingly close call. Safety margins are wide when pilots don't screw up. But this one di…

The recording is edited for highlights. The LiveATC archive has a ~40 second interval between "go around" and "flew directly over us" and even that archive is edited to remove silence, so the real interval may have been even longer.

Re: SFO near miss might have triggered aviation disaster

#356
post #295

Earlier quoted context omitted.

Yeah. When reading about modern air disasters, you often hear that five different things had to go wrong at once for them to happen. In this case, one or two things went wrong, the rest of them went right, and everything was fine.

This is spot on. The strength and weakness in doing something as complex as safely landing an airliner full of people is all in the capability of the human mind to use technology. Especially in flying, I think (I did this for a career, a whole other career ago) it's easy to have everything going smoothly, then some "minor" thing be out of expectation, but hey things are going smoothly, so dismiss the minor thing beca…

This is true in all manner of domains. I've never flown but I can remember a number of times I've made (fortunately relatively inconsequential) mistakes that caused me to face-palm afterwards. Why? Not so much that I made a mistake. But that I could recall clearly a number of observations that I made but dismissed because they ran counter to what I "knew" was the reality of my situation.

Re: SFO near miss might have triggered aviation disaster

#357

Earlier quoted context omitted.

No, you can't. A friend of mine couldn't become a commercial pilot because he has some kind of colourblindness. However, I remember him trying for some time and even campaigning for colourblind people to be admissible as commercial pilots because for the actual flying colourblindness doesn't seem to matter. So, perhaps ridiculous as it may sound taking colourblindness into account when proposing such an improvement i…

You can become color blind later though.

Or temporarily from medication, particularly those used to treat erectile dysfunction and benign prostatic hyperplasia [1][2].

[1] https://www.faa.gov/about/office_org/headquarters_offices/av...

[2] https://www.leftseat.com/viagra.htm

Re: SFO near miss might have triggered aviation disaster

#358
post #134
post #46

Earlier quoted context omitted.

Assuming the liveatc audio in the article has not been edited, it sounds like there's about 10 seconds between ATC giving go around and the United pilot saying they flew right over. With instructions given to Air Canada in between so it might have been seconds earlier. Based on that, it was seconds away from a collision. It seems like a near miss when considering aviation safety margins.

I would assume it was edited. He only joins the frequency about 30 seconds before it happens. That means tower only took control once he was 60 seconds before landing. I don't know the procedures at SFO but that seems too short.

It has been edited. The LiveATC archive has about 40 seconds between "go around" and "flew directly over us." The LiveATC archive appears to be edited to remove silence, so it may have been even longer.

Re: SFO near miss might have triggered aviation disaster

#359
post #29

Earlier quoted context omitted.

(pilot here) Yes, they are very well shown on maps, but it can be hard to map your diagram to what you're seeing, especially if it's raining or if it's at night, and even more if you're tired. I never made the mistake, but can see how somebody in bad conditions would.

Thanks! But why do you even have to map your diagram to what you're seeing? Isn't there a GPS system that shows you exactly where you are on the map and where you are going to go in the next few minutes? It doesn't seem like there should be any mental or visual processing to figure out that you're heading toward the wrong runway, right?

There is, if you use it. In this case they were doing a visual approach , where you use eyesight in order to line up and land, because you have seen the runway. People do visual approaches in SFO as they are necessary to land 2 aircraft at the same time on the parallel runways ( they're like 30ft too close for parallel approaches on instrument ). It is still recommended to even in a visual approach, turn on the instrument approach systems ( for that exact reason ) but it looks like it is not mandatory for that airline.

Re: SFO near miss might have triggered aviation disaster

#360

> Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic. [1] Is it just me or is this blatantly off-topic? Or is anything major happening in the bay area automatically on-topic for Hacker News? [1] https://news.ycombinator.com/newsguidelin…

There's something about air traffic that is very HackerNews. Search for "air traffic" to see what I mean. Maybe it's something about coordinating big complex systems, or maybe radio chatter is nerdy, I don't know, but it does make sense to me.
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