 However, the NTSB suggested in its finding in 1970 that the pilots misjudged their altitude position during approach and there were no navigational aids in the aircraft or near the airport.Officials at the New Hampshire Aeronautics Commission charged that the FAA had ignored repeated warnings about installing an ILS navigational approach at Lebanon Municipal Airport and that installing such system might have prevented the crash.The crash affected the struggling Northeast Airlines, as it was the fifth airline crash in its 25-year history.