The truth about TCAS.
A properly flown TCAS resolution advisory (RA) is NOT a violent manoeuvre.
Honeywell TCAS II Users Manual
TYPICAL TCAS II ENCOUNTER
The crew should promptly but smoothly follow the advisory.
[Honeywell TCAS II Users Manual page 8]
and
NOTES
When TCAS commands a corrective Resolution Advisory, sufficient time exists to perform a smooth vertical maneuver to avoid the conflict. TCAS II expects five second crew reaction time to initial RAs, requiring approximately .25 G. A change to the initial RA, including an increase or reversal, requires two and one-half seconds reaction time and up to .35 G.
[Honeywell TCAS II Users Manual page 68]
and
CAUTIONS
Do not over react to a Resolution Advisory. Fly only the vertical speed commanded. Using higher vertical speeds than that shown on the RA/VSI is NOT better.
[Honeywell TCAS II Users Manual page 67]
When issuing an RA the TCAS system calculates the required vertical speed based on the crew making no control inputs for five seconds, and then responding with a
change in G of +/- 0.25 G (as appropriate) until the aircraft’s vertical speed (or pitch attitude in some installations) is in the green range.
For a TCAS climb RA that’s a pitch up causing +1.25 G, and for a TCAS descend RA that’s a pitch down causing +0.75 G. Once vertical speed (or pitch attitude) is in the green range G returns to 1.0.
There is nothing violent about a smooth vertical manoeuvre of +0.75 G or +1.25 G.