FBW,
Thanks for a summary of your visit to the D&D chap.
Would you mind next time at the office, popping in to your supervisor and or techs and asking them what would happen if everybody in the UK FIR's switched their transponder to standby when changing squawk?
Would this suit the overall operation or not?
BTW, have a careful read of my precise words on TCAS. I didn't teach the use for a number of years to be taken for granted.
G'day
[This message has been edited by Feather #3 (edited 05 May 2000).]