An on-orbit upgrade and maintenance operation of BDS-3 MEO-21 satellite, BDS-3 MEO-22 satellite, BDS-3 MEO-25 satellite, and BDS-3 GEO-4 satellite will be carried out from 19 April 2026. According to the maintenance process, a single satellite will be set to be unusable for about 4 hours. 

As for BDS-3 MEO-25 satellite, the detailed duration is from UTC 19 April 2026, 23:00, to UTC 20 April 2026, 03:00; as for BDS-3 MEO-22 satellite, the detailed duration is from UTC 20 April 2026, 04:00, to UTC 20 April 2026, 08:00; as for BDS-3 MEO-21 satellite, the detailed duration is from UTC 20 April 2026, 08:00, to UTC 20 April 2026, 12:00; as for BDS-3 GEO-4 satellite, the detailed duration is from UTC 20 April 2026, 12:00, to UTC 20 April 2026, 16:00.