We know that just before reentry started, there was concern over a signal which indicated that the heat shield which would protect the capsule from the heat of reentry had become detached. This would have meant catastrophe, and orders were given to keep the retrorocket packs intact to hold the heat shield in place. However, it turned out that it was merely a faulty signal and there was no problem with the heat shield.
My question, or questions are: Why would the heat shield possibly come loose? Wasn’t it permanently attached to the rest of the capsule? Since there was a sensor that indicated that it had possibly come loose, this implies that in some circumstance, the heat shield was, for lack of a better term, detachable, or at least at risk of coming loose. Why would this be?