Originally Posted by
captjns
61.51(f)(1) pertains to second in command, in most cases a first officer. 61.55 states SIC qualifications. They can log the time they occupy the seat.
That said, savvy logbook reviewers may or may not take a dim view of a SIC from logging the entire time for a long haul flight.
How about 61.51(f)(2)? (1) and (2) are separated by an "or", not an "and".