It is not possible to attend the ATPL(A) skill test in aeroplane or simulator which represents the  Cessna C525 Citation series. There are two main contradictions to FCL.520.A.

  1. Cessna C525 Citation is certified by an EASA TCDS in accordance with CS-23 certification standard as a single pilot aeroplane operated in either single pilot operations and multi pilot operations environment. It is the same certification standard as used for certification of Cessna C-152
  2. Cessna C525 Citation is considered by  EASA Type Ratings and Licence endorsement lists as a single pilot high performance complex aeroplane.