The process of inspecting space shuttle Discovery's wing leading edge panels and nose cap with the Orbiter Boom Sensor System is explained with this animation narrated by STS-120 lead shuttle flight director Rick LaBrode.
Source: NASA TV (1 min 1 sec MPEG-4 (H.264) file)
Download this clip to your hardrive.
(Windows users right-click this link. Mac users control-click this link)