1 This very interesting pprune blog has informed us many times that all forms of communications from the missing B777 were shut down at about the time that the aircraft left the airways leading to China.
2 But several pprune posts have also told us that there were hourly pings from the B777 until shortly before the time that it was estimated to have run out of fuel (7 hours or so).
3 This same pprune blog has sometimes told us that the 2 Rolls-Royce Trent engines throughout the flight sent coded performance data back to R-R – as this system cannot readily be disabled or was overlooked.
(Most comments about R-R maintenance monitoring have been quickly deleted by the Mods. Watch this space!)
pprune blog quote:
Using the data from just eight satellite "pings" after the plane's other onboard Acars automatic tracking system went off at 1.07am, the team at Inmarsat was initially able to calculate that it had either headed north towards the Asian land mass or south, towards the emptiest stretches of the India Ocean.
So here are 3 simple questions:
1 What system & antenna aboard MH370 continued to send the pings?
2 What system & antenna aboard MH370 sent the R-R data engine monitoring data?
3 When did these two data streams cease?