FMAs...to callout or not
Some companies require Flight Mode Annunciator (FMA) changes to be called out and others don't.
Some require the callout to be acknowledged with 'checked' and others don't.
Some companies require the speed limit to be called before making a flap or gear selection, for example, PF:"Speed below, 250, Flap 1". PNF:"Speed checked; selected".
I am interested in your opinion and experience. Which do you believe is safer: crew chatter and multiple 'checked' calls for cockpit situational awareness or silent monitoring with maximum 'ears out of the cockpit'?
Does your company require crew callouts when things are going right or just when it's not?
Is anyone aware of any studies?