If you guys and gals want an enlightening experience, google Emergency Evacuation Slide SDR. Look at the various reports. You'll see the FAA has been dealing with this slide problem for 15-20 years. The 37% failure rate is well know as well. There have been several proposed Emergency AD's and the FAA has determined some of them to be too costly for the industry to apply. You can also see what the various shelf lives, repacking times and some deployment requirements by users. Very interesting. I've been in Military and commercial aviation for 30 years and had no idea this slide failure stuff has been boiling behind the scenes for sometime.