ACARS sequence
I suggest that similar observations can be made for most of the other 'gaps'. To list them all: at 2:11:00 -15s; 2:11:27 -15s; 2:11:55 -15s; 2:12:16 -35s; 2:12:51 -17s; 2:13:14 -31s; 2:13:51 - 23s.
In this connection, I have two questions on timing for anyone familiar with ACARS and satellite communication.
Firstly, the service provider's server clock may not be perfectly synchronized with that of ACARS. What difference is probable?
Secondly, the diagram of the messaging protocol between aircraft and satellite on page 47 of the 1st interim report shows that each message requires eight earth-satellite-earth transmissions. A wikipedia article on satcom states that each takes about 0,5 seconds for the distance alone, i.e. four seconds for the 8 transmissions. Would the server's reception time be for the first 'Request for communication' or the last 'Satellite acknowledgement'?
regards,
HN39
Last edited by HazelNuts39; 27th Jun 2010 at 11:04.