Highest level of technical complexity and training capability in the EASA and FAA regulations. In addition to the FTD definition, the FFS provides a vibration and cabin motion capability. The qualification levels range from A to D, although some lower levels are rarely used (level A in particular). The higher qualification levels bring a very comprehensive training capability to checking and testing.
OPC: Operator Proficiency Check
PC: for Proficiency Check
LC: for Line Check.