So, the question has come up recently about whether or not we should use the circuit breakers to fail the G1000 PFD in our C-172's. We have the "G1000 guide for designated pilot examiners and certified flight instructors" handout/document, but right at the beginning of that document there is a paragraph that relates the following: So, we also checked the POH for information on simulating a failure on the G1000 and there seems to be a lack there as well. We thought that we should fall back on the information provided in the G1000 guide but we are not sure. I pose the following questions to you: What does your flight school do for failures of G1000 primary systems/displays? Has anyone seen anything other than the guide I mentioned above concerning pulling the CB's to simulate a failure on the G1000? Do you have any other suggestions besides pulling CB's, dimming the screen, or stickers on screen? Thanks in advance!