Iridium 74 replacement by Iridium 21

In early January 2006, Iridium 21 (25778, 1999-032B), previously one of two spare satellites in orbital plane 1, entered the operational constellation, evidently to replace Iridium 74 (25345, 1998-032D), which was lowered to the engineering orbit. Iridium 74 appears still to be under control, so is possibly a partial failure.

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