The plane’s radio transponder stopped transmitting about 2,400 feet short of the runway
American Airlines Flight 5342 was inbound to Reagan National at an altitude of about 400 feet and a speed of about 140 miles per hour when it suffered a rapid loss of altitude over the Potomac River, according to data from its radio transponder. The Canadian-made Bombardier CRJ-701 twin-engine jet, manufactured in 2004, can be configured to carry up to 70 passengers.
A few minutes before landing, air traffic controllers asked the arriving commercial jet if it could land on the shorter Runway 33 at Reagan National and the pilots said they were able. Controllers then cleared the plane to land on Runway 33. Flight tracking sites showed the plane adjust its approach to the new runway.
Less than 30 seconds before the crash, an air traffic controller asked the helicopter if it had the arriving plane in sight. The controller made another radio call to the helicopter moments later: “PAT 25 pass behind the CRJ.” Seconds after that, the two aircraft collided.
The plane’s radio transponder stopped transmitting about 2,400 feet short of the runway, roughly over the middle of the river.
