It’s the remainder from the 90% rule. [Heavy] pilots aren’t always the A-code as ACs and IPs; we sometimes fly dual AC-AC lines, for example, or fly with multiple crews on board. 90% credit is our WAG to account for this fact and the remaining 10% would count as SIC if not holding the A-code but still flying.
In the airline world, only the A-code can log PIC, which is why you could technically count OTHER time if you were the A-code. Captains in the airlines log PIC even when they’re in the bunk...
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