I want to go fly a piston single as PIC. My last AFR earlier this year was in a twin. My last single engine related thing that would cover it was over 2 years ago. Does anyone know if I can go fly a single or do I need to do a SEA review first?
You sure can. 61.375 Limitations on exercise of privileges of pilot licences—ratings, states this.
(3) The holder is authorised to exercise the privileges of the licence in
an aircraft, other than an aircraft mentioned in subregulation (5),
only if the holder also holds an appropriate aircraft class rating for
the aircraft.
(4) For subregulation (3), either of the following is an appropriate
aircraft class rating for an aeroplane in the single-engine aeroplane
class:
(a) the single-engine aeroplane class rating;
(b) the multi-engine aeroplane class rating.
So if you keep your Flight Review current for multi-engine aeroplane class it allow you to exercise privilege for single-engine aeroplane as per paragraph (4).