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ASN Wikibase Occurrence # 121097
Last updated: 15 October 2021
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Date:11-MAR-2011
Time:13:21
Type:Silhouette image of generic B752 model; specific model in this crash may look slightly different
Boeing 757-232
Owner/operator:Delta Air Lines
Registration: N693DL
MSN: 29725/826
Fatalities:Fatalities: 0 / Occupants: 130
Other fatalities:0
Aircraft damage: None
Category:Incident
Location:near Atlanta, GA -   United States of America
Phase: En route
Nature:Passenger - Scheduled
Departure airport:Atlanta, GA (KATL)
Destination airport:La Guardia, NY (KLGA)
Investigating agency: NTSB
Narrative:
A Boeing 757-200 departed from Atlanta, Georgia, without its transponder activated, and the pilots did not contact air traffic controllers for about 8 minutes after departure. The airplane flew through one controller’s airspace and entered another controller’s airspace without coordination before radar and radio contact was established.

While the incident airplane’s transponder was not activated, the airplane’s radar data tag (which contained identification, altitude, and airspeed information) did not automatically appear on the controllers’ radar displays as it normally would have. Consequently, the airplane was displayed only as an enhanced primary target with no identifying information. Although local procedures require that Atlanta tower controllers verify that departures have a radar data tag before transferring communications to departure controllers, the tower controllers did not do so. Review of primary radar data determined that a loss of lateral separation occurred between the incident airplane and the following three airplanes: 1) a Beechcraft 55 (closest proximity 1.44 miles); 2) a Pilatus PC-12 (closest proximity 0.81 miles), and 3) a Canadair Regional Jet CRJ-100 (closest proximity 2.36 miles).
Probable Cause: The air traffic controllers’ failure to adhere to required radar identification procedures, which resulted in loss of separation between the departing Boeing 757 and three other airplanes. Contributing to the incident was the pilots’ inadequate preflight checks, which resulted in the airplane departing with an inoperative transponder.

Sources:

NTSB


Images:

Photo of N693DL courtesy AirHistory.net


Bonaire - Flamingo (TNCB / BON)
12 February 2020; (c) Anthony Statie

Revision history:

Date/timeContributorUpdates
13-Mar-2011 09:17 bizjets101 Added
13-Mar-2011 09:37 bizjets101 Updated [Aircraft type, Departure airport, Destination airport]
13-Mar-2011 10:13 bizjets101 Updated [Aircraft type, Source, Narrative]
14-Mar-2011 14:47 Anon. Updated [Aircraft type, Embed code]
26-Mar-2011 08:35 TB Updated [Aircraft type, Operator, Source, Embed code]
01-Mar-2012 11:50 isamuel Updated [Location, Departure airport, Destination airport, Source, Narrative]
27-Nov-2017 18:07 ASN Update Bot Updated [Time, Aircraft type, Cn, Total occupants, Other fatalities, Departure airport, Destination airport, Source, Damage, Narrative]
03-Aug-2021 17:40 TB Updated [Aircraft type, Registration, Cn, Operator, Other fatalities, Location, Country, Phase, Nature, Destination airport, Source]

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