JUNEAU, Alaska -- The plane that crashed into an Alaskan mountainside and killed former Sen. Ted Stevens and four others was outfitted with an alert system that warned pilots of dangerous terrain.
But National Transportation Safety Board chairwoman Deborah Hersman said that it's not known if the system was working just before the plane crashed Monday.
The plane was also equipped with an emergency locator transmitter, Hersman said at a news conference in Anchorage Friday. When properly registered, it issues a distress signal to a control center via satellites and provides registration information, such as the owner's name. She added that it was also unclear why that signal didn't activate.
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