I have heard the traffic avoidance commands TCAS issues called Resolution Advisories and Traffic Advisories. Are RAs and TAs the same or different alerts? And on a related note, how are TCAS commands enunciated? Are they visual, aural, or a combination? Ever curious, Jon ------------------------------------------------------------------- Jon Wright jwright@halcyon.com voice 425-635-0338 fax 425-844-1403 You've got a hard lip, Herbert. http://www.spudboy.com/~jwright