Originally Posted by
photonclock
Well, that's interesting. You seem to be saying that "the system" worked as designed? FDR notes immediately before your reply:
Did ATC do all of that? Having listened to the ATC comms (including the UHF) a few times, I believe they did, for the most part? They mentioned CRJ (of what use is mentioning the type at night, I have no idea, but they did), they mentioned where it was and where it was headed, and they received two acknowledgments...
So that means this collision occurred entirely within all established protocls?
These aircraft crashed, as per the system specifications.
So the system is, to put it plainly...FUBAR?
That's not good.
I agree. I expressed my inexpert opinion earlier:
The procedures effectively abdicate separation responsibility to a single point of failure, where failure is not unlikely and, as a consequence of the airspace design, failure results in high probabilities of collision.
The difficulties of identifying a specific aircraft, at night, in a background of stationary and moving lights, when moving objects on a collision course will always appear stationary to each other, are well known, as are the probabilities of mis-identification. The airspace design 'squeezes' inbound aircraft and transiting helicopters to practicality the same altitude, when instrument and other tolerances are taken into consideration.