New details in D.C. plane collision investigation

Aviation Safety Concerns - NTSB frustration stems from Army aviation experts' testimony regarding Blackhawk helicopter altimeters, which can be inaccurate by 100 feet or more [1] - The Army determined the altimeter inaccuracy was within tolerance levels and did not advise pilots [1] - The Army helicopter was flying 78 feet above the 200-foot limit when the crash occurred [2] - There are concerns that the crew's perceived altitude may have differed from the actual altitude [2] Incident Details - Air traffic control instructed the helicopter to pass behind the regional jet [3] - The helicopter's black box suggests the crew did not hear the instruction to pass behind the jet [3] - Passenger plane pilots initially resisted changing the runway landing assignment [4] - The pilots attempted to pull up at the last second before impact [5] Aftermath and Impact - The crash details and 15,000 previous close calls at Reagan airport were disclosed [3] - Families are adapting to life after the crash [3][4]