"BBC are reporting a final partial Inmarsat handshake ping received at 08:19 following the routine handshake received at 08:11 with no explanation".
Flame out.
RAT deployed.
SATCOM Packs ( are ON/RUN) provides the last (new) "handshake".
IF the report is actually correct.
Sounds plausible to me, however, ACARS on T7 is hooked up to SAFEBus, which is battery powered too. Flame out would not turn off BAT, right?