Airbus AP engagement and XPDR
Howdy, quick question that I havent been able to find an answer for and its wrecking my head.
Why does the TCAS/ATC selector, ie 1 or 2 have to correspond to the on side AP engagement. ie Capt is flying, AP1 will be used. On the Xpdr/TCAS box, its selected to ATC 1 (selector under stby/auto/on) when squawk code is inserted at the start of a leg.
It came up during line training when I was on the 320 but Ive totally forgotten. Maybe its just our company SOP but we are pretty well aligned with Airbus SOPs. Same procedure on our 330 fleet.
Cheers