Originally Posted by
Twin Wasp
The regs don't say much about logging SIC time. However, that's the way the company and regs count the time towards your daily, 48 hour, 7, 30, and 90 day and 12 month limits.
That would fly in the face of the regs as those limits are generally defined as "duty aloft", which is ALL time block to block. On a four person crew you are still a REQUIRED crewmember and, thus it is duty aloft and is accepted as logbook time.
If you are assigned a 13 hour flight thereby REQUIRING 4 crew, ALL 13 hours counts towards any flight time limitations. Many years of international ops and I have not seen it done any other way.