From what I heard, they are obviously critical but not a single point of failure. In fact they're made of several points that are expected to fail in a pre-det

From what I heard, they are obviously critical but not a single point of failure. In fact they're made of several points that are expected to fail in a pre-determined order to cover the "engine falling off the plane" scenario. I learned this from this superb article describing what happened when they failed in the wrong order: https://admiralcloudberg.medium.com/concrete-and-fire-the-crash-of-el-al-flight-1862-7f2e8fa4bee9 https://admiralcloudberg.medium.com/concrete-and-fire-the-cr...