> Inmarsat data tracks the Rolls Royce engines. This is not strictly correct. The pings that were being sent to the aircraft and which satellites received conf

> Inmarsat data tracks the Rolls Royce engines. This is not strictly correct. The pings that were being sent to the aircraft and which satellites received confirmations from were to the SATCOM system on board the plane. This is a multi-purpose communications channel. The ACARS is a maintenance reporting system which can send out various information about the aircraft at certain points, and which issued two reports about the Rolls Royce engines, but there were no further engine reports after the aircraft hit cruise altitude (it generally reports at takeoff, cruise, and landing).