Skylab Reboost Module

Skylab Reboost Module [NASA]

The Skylab Reboost Module was an attempt to save the Skylab space station by reboosting it to a save altitude for further use. It was planned, that one of the first Shuttle missions would dock to the Skylab station and install the Skylab Reboost Module. A launch no later than 1979 was needed to save the station. More Shuttle missions would then bee needed to refurbish the station.

When it became clear, that the Shuttle would not be ready in time to save Skylab, the Reboost Module was cancelled.