According to the news release:
In 2000, almost all new single engine light airplanes were manufactured with conventional analog flight instruments. Today almost all new light planes come equipped with digital flight display avionic systems, also known as "glass cockpits." The enhanced function and information capabilities of these systems represent a significant change and potential improvement in the way general aviation pilots monitor information needed to control their aircraft.
Yeah, so? What's the problem?
The hearing will start at 9:30 on Tues. March 9. You can watch it here.