Source: USGS Landsat Mission
Starting on Friday, March 25th, MSS orders will be held so that radiometric enhancements can be implemented. MSS processing will recommence on April 1st, and notices will be sent, as typical, when scenes are completed. For more information on these enhancements, please see the L1–5 MSS Calibration page.
+ “MSS orders held until April 1st,” USGS