After a discussion today with some other CFIs, two ways were claimed to be legal ways to build Multi PIC time:

1) One CFI claimed you can fly backseat if you HAVE an MEI with another MEI and a student upfront (3 in the plane). Under this premise he stated you are the 'instructor' to the MEI in the front and that he is the students 'instructor'.

2) Another CFI stated that even if you aren't an MEI but you are multi rated, you can sit back seat, claim you are SP and log that.

#1 sounds feasible and #2 sounds far fetched. Anyone know "FAA law" on this?

JP