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Key bit from the article translated: There is no connection to recent problem with the 737 MAX 9 where a door plug was not installed correctly. Instead, this

• dkjaudyeqooe 3y ago
  They say that, but the doors are closed, cross checked and then the pilots would be alerted by a sensor if a door is open. So did three or four members of staff get this simple thing wrong or is the plane at fault?
  • creshal 3y ago
    Are the door sensors redundant on the 737, or do the crew and pilot just check different readouts of the same?
    • dkjaudyeqooe 3y ago
      One flight attendant physically closes and arms the door, so it is in automatic mode such that the slide will deploy if its opened, then a separate flight attendant physically checks that it is closed and armed. I have no information the sensor redundancy, but the physical checks are redundant.
• littlestymaar 3y ago
  How can a plane take off if the door isn't properly closed? How isn't there a detector, and a mechanism that just prevent the plane to even move if the door isn't closed. That's what trains do (and the earlier iteration of this design in train is decades old and really basic: on old trains there's a wire running through all doors which are acting as switches mounted in serial: if one is open, there's no current)
  • JoshTriplett 3y ago
    On trains, "stop" is generally a safe action. On planes in the air, "stop" is a deadly action. As described, that sounds like a mechanism that could potentially go very wrong on a plane. By way of example, consider if the plane was in flight and a door opened: the pilots need full control of the plane in order to land it. There should absolutely be mechanisms to detect and avoid this situation, but hard interlocks like you're describing could cause catastrophic failures in flight.
    • littlestymaar 3y ago
      > On trains, "stop" is generally a safe action. On planes in the air, "stop" is a deadly action. Having worked in this industry (edit: train industry) I'm fully aware of that. > By way of example, consider if the plane was in flight and a door opened the pilots need full control of the plane in order to land it. Not necessarily. Or at least it depends how you define “full control”: of course everything related to flight is mandatory. But, for instance, the ability to unlock the parking brakes of the landing gear likely isn't something you need while piloting mid-air and this is enough to implement the safety mechanism I talked about. Also, you could have a bypass for the safety lock in case something goes wrong. For instance in PWR nuclear reactors, you don't want to accidentally overflow the steam generator, so there's one pump, designed to feed it when the reactor is stopped, that is disabled when the reactor is running. But in case of accident you may actually need this pump, so there's a key (literally a physical key) that you can use to disable the protection and make the pump usable in that mode too.
      • JoshTriplett 3y ago
        > Also, you could have a bypass for the safety lock in case something goes wrong. [...] there's a key (literally a physical key) that you can use to disable the protection I'm entirely in favor of having a safety mechanism with explicit warnings and a bypass mechanism, with that bypass mechanism being something that should never happen in normal operation. I was solely arguing against the kind of interlock that a train has where "current can't flow" if the doors are open, since the plane should absolutely be able to operate with the doors open in order to safely land.
• aydyn 3y ago
  This response is incredibly dramaphobic. I want to hear more anti-Boeing screeds.