Pretty important, as it turns out. While this is not a general aviation incident, the lesson here is dramatically applicable to all of us.
The FAA prepared an analysis of what happened to a China Airlines Boeing 737-800 on August 20, 2007, after landing at Naha Airport on Okinawa, Japan. Watch these two short videos. The first is an animation that explains what happened. Then, watch the second video, which shows the consequences of one missing washer.
That’s about a $90.5 million washer, based on average 2013 Boeing list prices. The 165 people on board were evacuated with no casualties, even though it appears to take about three and a half minutes for fire trucks to arrive. Thanks to my friend Bob Punch for calling this to my attention.