FY-4B will drift from 133°E to 105°E, replacing FY-4A as the primary operational satellite. The transition period starts from February 1^st through March 5^th. FY-4B data collection will be disabled during its relocation and be operational afterwards at 0:00 (UTC) March 5^th. At the same time, FY-4A will drift to 86.5°E as backup and stop data service.