Airplanes are mechanical contrivances. So it shouldn't come as a surprise to learn they sometimes break. The object, of course, is for them to break on the ground, preferably right in front of a maintenance shop at which you have a credit on your account. It rarely works out that way, of course. Instead, airplanes can and do break while we're flying them. But even when they let us down, they usually have been signaling in some fashion what's about to happen.
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