New details in D.C. plane collision investigation

highlighting surveillance video of the midair crash over the Ptoac River. Frustration from NTSB board members after Army aviation experts testified that one of the altimeters in the Blackhawk helicopter fleet is often inaccurate by 100 ft or more. But the Army determined it was within tolerance levels and never advised the pilots.How much tolerance should we have for aviation safety whenever civilian lives are at risk. The Army chopper was flying 78 feet above the 200 foot limit when it crashed into the Ame ...