Barometric altimeters are most common, and measure altitude above sea level using atmospheric pressure. Modern commercial ...

Evaluating the altimeters themselves and determining their independent functionality will be another piece of the puzzle. They’ll also review engineering documentation to understand how “bad ...

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

The Black Hawk helicopter may have been flying with “bad data” and didn’t hear all air traffic control instructions before colliding with a passenger plane, officials said.

The National Transportation Safety Board says altimeter in the Black Hawk helicopter may have malfunctioned before the DCA ...