So, it is not 100% clear to me if the autopilot-flight-director & autothrottle performs differently in windshear escape vs. a normal go-around. I always thought that it did as described by the FCOM regarding 600-1200 fpm pitch to speed transition, etc, but a colleague seemed to challenge my belief. I was under the impression that the AFDS did not behave in the same manner during a normal go-around when no windshear was annunciated.
The follow-up question, then becomes, if the AFDS/authothrottle does in fact behave differently for windshear recovery, what exactly is technically required to for the airplane to shift from normal go around to windshear? Is it the subsequent press of TOGA after windshear is annunciated? If TOGA is already the active pitch and roll mode is the presence of the warning sufficient to activate the windshear flight guidance?
It seems well established that pressing TOGA after windshear is annunciated is required by the FCOM windshear recovery (even during a manual recovery, the FCOM says to press TOGA, then to turn off the autothrottle, as obviously pressing TOGA will automatically re-engage autothtorttle unless someone has turned the arm switch on the MCP off). I'm more interested now in know "why" to help settle the debate.