Time:0203:41 MYT/Details

1. Safety Investigation Report MH370/01/2018 Satellite Ground Station Logs - Key Observations

   GES initiates a DATA-2 ACARS transmission (uplink), but receives no acknowledgement from the SATCOM.
   

   1. Therefore, the SATCOM Link was lost at sometime between 1707:48 and 1803:41.
   2. There is no evidence of a cockpit-initiated manual Log-Off of the SATCOM.
   3. Note that even if the on-board ACARs equipment was failed, disabled or powered down at this time, it would not prevent the SATCOM from acknowledging the ACARS-related P-Channel transmissions from the GES.

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Ground earth station. A satellite ground station sends or receives data from orbiting satellites. (Source: ATSB)

Aircraft Communication and Reporting System

Satellite Communications