The National Transportation Safety Board says altimeter in the Black Hawk helicopter may have malfunctioned before the DCA mid-air collision with an American Airlines jet. All 67 people aboard died.

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 ...

Airplane altimeters rely on a spectrum from 4.2 GHz to 4.4 GHz, but some cannot filter out 5G transmissions from the carriers' spectrum in the 3.7–3.98 GHz range.

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The Senate Commerce Committee’s reconciliation proposal to sell slices of spectrum is generating warnings that the move will interfere with sensitive aviation instruments like radio altimeters ...