NTSB: re-evaluate crashworthiness test requirements for overhead units and bins

The U.S. NTSB notes that there have been several survivable accidents in the last 3 years in which overhead bins and passenger service units (PSU) on Boeing 737 airplanes became separated from their attachments during the accident sequences. This suggests that current crashworthiness test requirements do not provide an adequate basis on which to evaluate how these items will withstand impact forces during survivable accidents.