Is there a specific reason the rate of descent for an RA is 1500'/min?
Reason I ask, many commercial operators in regular arrival descents from cruise descend at 2500-3500 feet per minute depending, and I've seen 737NG's give 5500-6000'/min when asked to increase rate of descent to clear traffic.
So my obvious question since an RA means two airplanes are too close to each other, why not move in the appropriate direction as fast as safely possible, I mean passenger comfort is one thing, but I think they'd prefer a little upset stomach to the possible alternative?
Also scenario (Assume structured airspace):
Airplane 1 Proceeding AAA-BBB at FL360
Airplane 2 Proceeding AAA-BBB at FL350
Airplane 3 Proceeding AAA-BBB at FL340
(All three airplanes are vertically stacked on top of each other)
Airplane 4 Proceeding BBB-AAA at FL350
How would TCAS re-act to this scenario? Also what if the offending airplane has an older version of TCAS...