So I can completely see how a crew could miss disconneting the AT during a high stress event!!
No high stress event going on..Normal approach, decent weather, good airplane, an extra pair of eyes and ears in the cockpit....
If ya forget to fly the plane things could turn into turd real fast..Then if ya forget to disconnect AP and AT when turd hits fan, it could get real nasty up to an including crash.
No big surprise going on here, just very basic flying...Or lack of.
