How many acro flights are required in a balance beam routine if it only includes one D acro flight without a C salto?

In a Level 10 balance beam routine, one D acro flight element is required to satisfactorily meet the acro flight requirement for the routine. The scoring system distinguishes between different levels of difficulty for elements, categorized by their letter designations (A, B, C, D, etc.). A D acro flight, considered a more difficult element, fulfills the requirement for an acro flight in the routine.

If a routine includes just this one D acro flight and does not contain any other flight elements, including a C salto, then it meets the minimum requirement of having at least one acro flight. Therefore, achieving one D acro flight is sufficient to satisfy the criteria set for balance beam routines at this level, confirming the answer as one acro flight required.