I see that this thread is still going.
To those that think their lookout is unassailable, read this Accident Report - a redacted version of the full report is available online here:
[ARCHIVED CONTENT] Page not found
(it is there - no idea why this error message appears?)
Part 1.4 of the report (Findings) includes Human Factors and, specifically, addresses the ability to ‘see’ at paragraph 2. b. For convenience, this link will take you directly to Part 1.4:
http://www.mod.uk/NR/rdonlyres/2BE26...4_Findings.pdf
Incidentally, since my last post I have flown many sorties with the MRX - it is invaluable. Not
infallible, but
invaluable nevertheless. Buy a TCAS. I don't care which one, but if you are serious about aviation and safety then you cannot possibly overlook the contribution that these make to safety.