Equipment malfunction, dropped messages looked at by NTSB in midair crash near D.C.
The National Transportation Safety Board is looking into flight data discrepancies, potential altimeter malfunctions and a possible miscommunication with air traffic control in the midair collision of an Army helicopter and a commercial airplane last month in the deadliest U.S. air crash in almost a quarter century.  “We are looking at the possibility of there may be bad data,” NTSB chair Jennifer Homendy said at a news conference on Friday. “We have a lot of work to...
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