TCAS would be great if the 'Fuzzy MEL' didn't rule in Nigeria, I would imagine that with the continual difficulty of getting spares into Nigeria will render it very difficult to ensure that no-one could depart base with an inop TXPDR. I also suspect that the spares issue is even more acute now that the previously normal 'Expedite' process cannot be used in Nigeria for fear of offending the squeaky clean 'Post Enron' crowd.
Another point is when will someone look at the East Shetland Basin structure as an example for route structures in the PH zone. Seperating the inbounds and outbounds vertically as well as horizontally may be an option to consider. I am sure there are lots of sensible GoM examples as well.
As a matter of interest, is there a different TCAS RA alogrithm for helicopters as against FW?
Regs to all the suvivors.
TOD