On Mon, 22 Jan 2007 09:20:51 -0500, Dave Butler wrote:

You can log PIC, instructor or not, any time you are either acting as
PIC, or the sole manipulator of the controls.

For Part 91 flights, the non-instructor must be PIC on a flight which
requires two flight crew members if he is not the sole manipulator.
Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)