The Citation 550 is a two pilot aircraft. The Captain has the ability to get a waiver and training to be certified to fly the aircraft single pilot but it is his option weather to use that or not. I am currently flying a Citation 550, with an SIC type rating that I received while working on the aircraft. A lot of our customers want two pilots on board and I have been back and forth over this regulation. My local FSDO had nothing bad to say about issuing the SIC type or questioned how I received the training.