Posted by bradleybuda 1 day ago
I second that. Hearing in the VASAviation video (linked by someone else in a nearby thread) the robotic voice announcing what it's doing, while it does a completely autonomous landing in an airport it autonomously decided on, with no possibility of fallback to or help from a human pilot, is one of these moments when we feel like we're living in the future promised by the so many sci-fi stories we've read as children.
To answer your question though, LVL has been around for close to two decades now. IIRC there was a Cirrus/Garmin partnership that added it to the latter's G1000/GFC 700 and it's since trickled out to other consumer-grade autopilots.
If the captain could figure it out, so could the computer.
I recall another crash, not so long ago, of a commuter plane where the wings iced up a bit and the airplane stalled. The crew kept trying to pull the nose up, all the way to the ground. They could have recovered if they pushed the stick forward - failing basic stall recovery training.
There are many others - I've watched every episode of Aviation Disasters. Crew getting spatially disoriented is a common cause of crashes.
What exactly was a computer at the time supposed to figure out with unreliable data, especially after a stall had first developed?
Also in fairness I was a bit too opaque with my point, which is that 1) LVL requires the pilot to actually press it, which they are unlikely to do if like you yourself have mentioned they are clueless about what situation they're actually in, and 2) LVL is not appropriate stall recovery so I don't really see how it is relevant to a case of an aerodynamic stall.
Of course. I did say it was a button to press!
> LVL is not appropriate stall recovery
It should be. I don't see how it couldn't be designed to do stall recovery. After all, the avionics do recognize a stall (as it activates the "pull up" stick shaker).
Yep, the real design problem here is the idiocy of allowing dual input.
There is no engineering fix to AF447. You cannot protect a plane from what is essentially a rogue pilot who is not restrained.
It would have happened exactly the same in a Boeing. The problem was a supposedly trained and tested pilot responding to a somewhat normal event (loss of awareness and disorientation) by freaking the fuck out and throwing a plane into the ocean from 30k feet. The copilot knew what was going on with 3 minutes left until impact, and was trying to fix things, and was using the feature to override dual input, and was still being hampered by a pilot who was refusing to do the only safe thing he should have: Sit back and shut the fuck up.
The actual solution is regular testing of pilots in stressful simulations to ensure they react predictably in bad situations. That can never be perfect though.
P.S. my lead engineer at Boeing told me they can fix everything but the "nut behind the wheel".
As I mentioned before, my dad taught instrument flying. What he'd do is go through all the maneuvers where your body gets tricked, and the student (under a blackout hood so they could only see the instruments) must recover. And they'd do it over and over, until the student stopped believing his screaming senses and trusted the instruments.
I don't know all that can be simulated in a simulator. I don't know if modern flight training is sufficient.
BTW, experiments were done with birds to see how they flew "in the soup" (zero visibility). The birds would just fold their wings and drop out of it. It seems that evolution hasn't evolved a method for navigating blind.
There’s probably a lot that match, but sounds like Colgan Air 3407 in 2009 (the last major commercial airline crash in the US before the mid-air collision earlier this year in DC)
> "If the captain could figure it out, so could the computer."
The aircraft system entered ALT2 mode, where bank-angle protection is lost. Protection for angle-of-attack is also lost when 2 or more input references are lost.
You might describe these circumstances as the computer saying "I don't know what the heck's going on, you humans figure it out please".
Having 3 pitot tubes iced over means they read 0 velocity. It is reasonable for the computer to be designed to recognize that if all three pitot tubes read 0, then the pitot tubes are the problem. With the altimeter unwinding, it should be able to recognize a stall. With the turn and bank indicator, and the AOA indicator, it should be able to return to straight and level.
Recall that the captain figured it out at a glance and knew exactly what to do.
The pitot tubes had differential icing, and didn't all read 0kts – they reported different velocity against each tube, such as 40kts or 60kts (against an expected baseline of ~ 275kts). The computer correctly recognised the data was invalid and rejected it.
It's a common narrative that the captain immediately figured out the issue. The report and transcript of the cockpit recording[2] notes that the captain's interventions showed that he had not identified the stall, nor had the copilots.
~ cockpit recording ~
0:00 autopilot disconnects
0:01 [copilot right] "I have the controls"
0:11 [copilot right] "We haven't got a good display of speeds"
1:26 captain enters cockpit
1:30 [copilot right] "I don’t have control of the airplane at all"
1:38 [captain] "Er what are you doing?"
3:37 [captain] "No no don't climb"
4:00 [captain] "Watch out you’re pitching up there"
4:02 [copilot right] "Well we need to we are at four thousand feet"
4:23 ~ recording stops ~
[1] https://www.faa.gov/sites/faa.gov/files/AirFrance447_BEA.pdf
[2] https://bea.aero/uploads/tx_elyextendttnews/annexe.01.en.pdfBTW, my dad taught instrument flying in the AF. He said it was simple - look at the instruments. Bring the wings level, then the pitch level. Although simple, your body screams at you that it's wrong.
He carried with him a steel pipe, so he could beat a student unconscious who panicked and would not let go of the controls. This was against regulation, but he wasn't going to let a student pilot kill him.
When JFKjr's crash was on the evening news, he said two words - "spacial disorientation". Months later, that was the official cause.
Most flight instructors just keep a spare pen in their pocket to jab an uncooperative student in thigh with. (Thankfully almost never used.)
- https://www.garmin.com/en-US/blog/aviation/blue-button-helpi...
- https://pilotsupport.avidyne.com/kb/article/50-dfc90-wings-l...
Awesome to see stuff like this. Light sport aircraft have parachutes. Cool to see safety being incorporated into the avionics and not just flying it, but getting her down safely.
Instead, the FAA is probably going backwards on this issue and doubling down on the regulatory framework that gave us the MAX-8 situation while narrowing any avenue for smaller firms to innovate [0]
Not sure why the downvotes when all I want is for someone to live. I understand it’s harder for larger aircraft but anything 8 passenger or less, this should be considered.
My wish is that one day aircraft will operate off batteries that are charged via the fuselage solar panels and that the airframe will be light enough to support “rapid deceleration pods” or other parachute like devices to bring the aircraft to the ground. Larger commercial aircraft can recharge at the gates.
Eliminating the combustible fuel in the wings is another huge win.