The radio altimeter on board the Black Hawk at the time of the deadly midair collision read 278 feet, Homendy said. That altimeter uses a radio beam to show the helicopter’s altitude above ground ...

Homendy says a radio altimeter - which uses radio waves bounced off the ground to measure the aircraft's altitude - and information gleaned from a flight data recorder were in conflict and showing ...

NTSB's Friday briefing about the fatal midair collision near DCA highlighted ongoing investigations into potential radio communication lapses.

The radio altimeter on board the Black Hawk at the time of the deadly midair collision read 278 feet, Homendy said. That altimeter uses a radio beam to show the helicopter’s altitude above ...

“Seventeen seconds before impact, a radio transmission from the tower ... that's what the Black Hawk crew was seeing on the barometric altimeters in the cockpit,” she said.