Q1. What's with 737s?
Q2. What's with 737maxs?
A. It's a kludge.
movie has to be seen to believed] .say. If the nose goes up tooo far the wings lose their capacity for aerodynamic lift and the plane falls out of the sky - it's called a stall. Competent pilots can recover from a stall . . . if the ground isn't too close. Stalling being seen as the problem, the Boeing engineers had a 'fix' which was to nudge the nose downwards by twitching the tail flaps. This was all to be done automatically with a software fix called the Maneuvering Characteristics Augmentation System (MCAS) which took data from the Angle of Attack AOA sensors on the front of the plane. In Ethiopia, and previously in Indonesia, the AOA seems to have jammed in the up position; MCAS kicked in to lower the nose; the pilots tried to keep the nose up while frantically trying to work out why their plane was going weird on them; the MCAS won and everyone died. I'm getting some info from Juan "Oroville" Browne at Blancolirio [dam-prev], a qualified pilot and following my nose [keep it Up, Bob, you're not going to stall] to fill in the backstory. Boeing engineers have been mandated to lather on another layer of fixes to fix the fixes - because it is too expensive to go back to the drawing board and design the whole plane better. There were nearly 400 of these 737MAXs disaster-waiting-to-happens out there (until they were [reluctantly] grounded) and 5,000 on firm order. We'll see if Boeing can recover from the reputational damage / PR disaster. Wendover Prods explains this better than I can - with pictures. And latest on cost-to-Boeing from Blancolirio.
Because flying is magic [Any sufficiently advanced technology is indistinguishable from magic, Arthur C Clarke] to the most of us, we take the words and deeds of designers, engineers (and pilots) on trust. Somehow we feel that, as drivers, we have locus standi to have an opinion on driverless cars - whether they are A Good Thing and how they should deal with Edge Cases. I've put out my utilitarian stall on trolleyology in several guises before - and I've also mentioned driverless cars before as a sort of inevitable future for us. Radio Canada put out a nice little essay with cute super-primitive cartoon movies about where utilitarian maths might be programmed into driverless cars to have the best possible outcome if things go wrong:
- five people privileged over one
- pregnant women [two people?] privileged over other people
- innocent bystanders privileged over jaywalkers
- they can be legit killed if crossing the street away from a ped-Xing
- children privileged over pensioners
- the 'driver' privileged over The Other
- people privileged over property.
It's a nice conundrum and the story was picked up by Metafilter where lots of people rowed in with their own perspective on the matter. The Metafilter co-operative crowdsource is really rich in viewpoints.
- Those nerdnik programmers will be working for a company and that company will have a legal / litigation department who will be looking forward to the first case against the company. It's not going to look good, if the attorney, for someone your software has killed, find that your engineer has preferred a swerve into someone rather than just slamming on the brakes. The Just Brake sub-program is going to be easier to write also; rather than trying to reliably machine-learn pregnancy vs obesity.
- And WTF are we at with the tyranny of the car? Why should people careering around in a metal box be allowed to damage bollards & trash-cans, let alone running over pedestrians and cyclists?
- If we are going to have cars, though, let's not have them driven by drunken yahoos, txtn their slobby pals. Those creatures kill 100-200 people a year in Ireland and 100 people a day in the USA. Surely, a six y.o. robot could do better.
Finally and as a salutary antidote, before you next rev off in your metal box to buy some useless old utensils, spend 20 minutes watching this story of 4 carpenters spending a week making 8 x 13m rafters for a medieval church. The last rafters lasted 800 years - I put it to you that there is nothing you can buy at the end of your carbon-tax-free car-journey that will last even 800 weeks.