3 ms·
If you shut off the engines a couple of dozen meters above ground shouldn’t every alarm be blaring or there should be some sort of additional lever you have to
by dyauspitr 1y ago
If you shut off the engines a couple of dozen meters above ground shouldn’t every alarm be blaring or there should be some sort of additional lever you have to pull way out of the way to enable shutting off the engine that close to the ground.
- WalterBright 1y agoConsider a case where the engine starts to violently vibrate. This can tear the structure apart. Delaying shutting off the engine can be catastrophic. It's very hard to solve one problem without creating another. At some point, you just gotta trust the pilot.
- dyauspitr 1y agoWould it matter in this case since you would crash either ways. I’m talking about protection in a very specific situation where you make it harder to shut off both engines when you’re very close to the ground.
- WalterBright 1y agoIf the ground you are over is a good landing spot, your best chance is to cut off the fuel to that engine ASAP.
- dyauspitr 1y agoAll I’m saying is in those situations it should involve another toggle or pedal that needs to be pushed to cut off the engines so it’s outside the realm of muscle memory.
- WalterBright 1y agoOk, but that also will delay the shutdown and if it's too complicated the pilot may forget it in his extreme stress.
- throwaway48476 1y agoYou cant force individual action alignment with technology. People never learn this.
- russdill 1y agoIf you read through the boeing procedures, if an engine fails just after take off you delay cutting throttle or hitting the cutoff until you have positive climb and pass a certain altitude. Specifically because a mistake here would be so incredibly catastrophic. The following number of steps and verbal cross checks for then shutting down the engine are quite daunting. Not something applicable here, but still interesting to learn about
- jacquesm 1y ago[flagged]
- interestica 1y agoThat’s absolutely applicable here. It means that an engine cutoff shouldn’t be allowed at all during certain parts of flight. It’s not crazy to think that a design fix would be to prevent those engagements during certain parts of takeoff (a certain window). It’s fly by wire anyway so it could presumably be done programmatically. MCAS was basically made to prevent user input that would send the plane into a dangerous angle. The computer overrode the inputs. So there’s precedent for something like it.
- WalterBright 1y ago> The computer overrode the inputs. This is incorrect. The manual stabilizer trim thumb switches override MCAS.
- interestica 1y agoAre we not in agreement? MCAS overrode the inputs and the thumb switches could override MCAS?
- invalidator 1y agoMCAS autonomously adjusts trim downward. The trim switches override MCAS, but when released, MCAS can resume trimming down again. The trim adjustments don't "override" the pilot's elevator inputs (MCAS has no direct control over the elevators), but they can make the controls so heavy that it's impossible to pull up.
- bestouff 1y agoOn an Airbus yes, engines won't stop if the thrust lever isn't on "idle". Not so much on a Boeing.