Originally Posted by
Shaka Zulu
@DozyWannabe. TCAS doesn't receive any speed input whatsoever. It calculates closure rates based on comparing time it takes to send a signal and receive it back at the antenna.
No Air Data Input.
I stand corrected - cool.
Right, so that being the case there are two questions. If TCAS doesn't require air data itself, is the way it's plumbed into the A330's avionics something to do with it? Also, at what point in the ACARS sequence did that message fire? Early on, it might raise some questions. Later, as more systems began to fail it might be a moot point.