Correct me if I'm wrong but from my knowledge appogiaturas begin on the beat and acciaccaturas begin before the beat.
How then exactly is one supposed to play this 3-note appogiatura (or any-note appogiatura in any piece for that matter) in Rondo alla Turca? From what I hear and see other people play, the appogiatura here is played before the beat and then the A note and C# octave are played on the beat. My initial thought was since this is an appogiatura the first note of the appogiatura and the C# octave above would be played on the beat brushing up to the A note.
So my question is how are you supposed to play multi-note appogiaturas (in this piece and in general) and how would it be different if it were an acciaccatura?