The Army was one of 28 government agencies authorized to fly helicopters near Ronald Reagan National Airport before its Black ...

This is *** 1998 aircraft. um, you can see by the instrumentation ... artificial horizon, uh, we have our radar altimeter, vertical ascent descent. Um, we have our mean sea level, uh, we have ...

and while we know the helicopter was at 278feet based on its radar altimeter, investigators don’t know what altitude was displayed to crew. Around 17 seconds before the crash, air traffic ...

The second, the radar altimeter, is based on the helicopter sending a radio frequency signal from an antennae to the ground and would have provided the crew additional real-time information on ...