Cherokee Pilot and Ballistic Pilot: I am a Bonanza pilot and greatly appreciate your extensive comments ... very very helpful.
Yesterday (August 9, 2013) I was flying from Walla Walla, WA to Bremerton, WA, over the Cascade Mountains east of Seattle, under flight following from ATC, when my iPad3 shut down due to overheating. I was VFR at 8500 MSL but due to forest fires, eastern Washington was pretty hazy. I have a Garmin 696 and Garmin 480WAAS, but have tended to make the iPad Foreflight my primary focus because it is so easy to modify a route. After allowing the iPad to cool a little I had my passenger hold the iPad in the air for several minutes, but eventually placed it back in the iPad holder but did not clip it since it was obvious that the holder metal plate up against the back of the iPad was not helping the situation. That left an air pocket between the iPad and holder. During the cool down moments, I quickly went to the 696 to make it easy to stay on the planned course. Because Walla Walla was 96 ºF I had onboard a small personal fan but it didn't click to me to have my passenger get it out and hold it appropciately.
I don't like the 50% reduction in brightness solution because in the bright sun I need the iPad to be as bright as possible.
My iPad is max'd out -- 64 GB version. Thus I tend to have many different apps active. I suspect that the heat issue might be reduced if I would leave only Foreflight active.
Thanks again for your comments.
Bonanza Pilot