[dkjaudyeqooe]

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]

Are the door sensors redundant on the 737, or do the crew and pilot just check different readouts of the same?

[dkjaudyeqooe]

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.