Kikapu wrote:Pyrpolizer wrote:Kikapu wrote:It gets more and more puzzling.
A question.
Why were these engine ping signals invented in the first place, to be sent out once every hour? Most of the time any crashed aircraft is found fairly quickly through normal channels, even AF447, so why have this also. It would make sense to have it if it gave conclusive information as to where the aircraft was/is to find the crash site, but obviously, it has been no help so far in the case of MH370. Perhaps it may have even damaged efforts to search for the MH370 in more likely locations.
Naughty-naughty Kikapu! You know all the answers and you pretend not to.
One more question like that and you will send our friend on orbit
No, really, I was being serious.
I mean, we have ACARS which was a major help with information on the status of the AF447 plane, which basically showed that the plane had crashed, so why have the pings from the engines. The engine pings does not even say whether the plane crashed or not.
In order to disable ACARS, all SATCOM channels must be disabled. This can be done from the cockpit. However, this does not completely disable ACARS! Therefore, the aircraft still sends pings to the Satellite without all the other vital information such as callsign, speed, altitude, position and engine and systems health checks. To disable ACARS completely, you will need to pop the correct Circuit Breaker and that is located in the NAV bay underneath the cockpit.
You are able to receive these transmissions with a simple ADS-B VHF Receiver + software or you can go to a couple of websites which actually decode and transmit these messages over the web as far as callsign, altitude, speed and position are concerned. What you do not get are the engines and systems health checks.
The pings test the reachability of the signal to a host satellite for interrogation. It also measures the round trip time to the Satellite and obviously there will be a difference in time between the uplink and downlink hence the ability to calculate whether the aircraft is moving towards or away from the Satellite. Unfortunately, there was no other Satellite to receive these pings because if there was then MH370 could be pinpointed to 2 possible locations where the 2 arcs intersect each other. If there was a third, then MH370 would have been pinpointed to within 300m because the 3 arcs will intercept one another giving away the aircraft's position with excellent accuracy almost to GPS standard
Here is an example of such a website:
http://flightaware.com/