I thought it was helpful:
Another clue is that part of the Boeing 777's Aircraft Communications Addressing and Reporting System (ACARS) was shut off.
The system, which has two parts, is used to send short messages via a satellite or VHF radio to the airline's home base.
The information part of the system was shut down, but not the transmission part. In most planes, the
information part of the system can be shut down by hitting
cockpit switches in sequence in order to get to a computer screen where an option must be selected using a keypad, said Goglia, an expert on aircraft maintenance.
That's also something a pilot would know how to do, but that could also be discovered through research, he said.
But to turn off the other part of the ACARS, it would be necessary
to go to an electronics bay beneath the cockpit.
That's something a pilot wouldn't normally know how to do, Goglia said, and it wasn't done in the case of the Malaysia plane. Thus, the ACARS transmitter continued to send out blips that were recorded by the Inmarsat satellite once an hour for four to five hours after the transponder was turned off. The blips don't contain any messages or data, but the satellite can tell in a very broad way what region the blips are coming from and adjusts the angle of its antenna to be ready to receive message in case the ACARS sends them. Investigators are now trying to use data
http://www.huffingtonpost.com/2014/03/16/malaysia-airlines-takeover_n_4972889.html