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US | FAA Investigating Some Flights Receiving Mystery Midair Collision Alerts Near Reagan National Airport (simpleflying.com)

submitted 1 week ago* (last edited 1 week ago) by [email protected] to c/[email protected]

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The tragic midair collision at Reagan Washington National Airport in January this year brought the focus on the congested airspace over the airport. The Federal Aviation Administration has implemented some restrictions around its airspace as the investigation into the crash continues.

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[–] mkwt 0 points 1 week ago

TCAS is programmed not to give alerts below 500 feet above ground.

One reason is that, to keep the system simple, TCAS resolution advisories only ever say to go up or down. That close to the ground a regular resolution advisory would tell one aircraft to dive into the ground--so the advisories are suppressed.