On Thu, 08 Mar 2007 04:40:02 GMT, Jose
wrote:

The student's preflight is probably much slower. The instructor's
preflight probably concentrates on a few critical issues.

Plus the instructor very likely has already taken the plane up that
day. *And* he knows the plane.

The other day I had my biennial in the instructor's own airplane. I
was amused to realize that he was doing his own preflight check even
as I was finishing mine. But in this case he hadn't flown the plane
that day.