You can't.
I was only pointing out that you can fly with a licensed pilot as a consultant ( teacher ) even if you do not hold a current medical.
Incidentally my medical is current.
Going back to my starting this thread it was to point out that not holding a current instructors rating does not mean one has suddenly become incompetent as a teacher.
Holding a current instructors rating does allow you to teach at the ab-initio level where the pay is sub standard to a common labourer.
To me it makes no sense to hold a rating that will only result in working for peanuts.
Last edited by Chuck Ellsworth; 27th Dec 2009 at 15:33.