ASN Wikibase Occurrence # 121097
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| Date: | Friday 11 March 2011 |
| Time: | 13:21 LT |
| Type: |  Boeing 757-232 |
| Owner/operator: | Delta Airlines |
| Registration: | N693DL |
| MSN: | 29725/826 |
| Engine model: | P & W PW2037 |
| Fatalities: | Fatalities: 0 / Occupants: 130 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | near Atlanta, GA -
 United States of America
|
| Phase: | Take off |
| Nature: | Passenger - Scheduled |
| Departure airport: | Atlanta Hartsfield-Jackson International Airport, GA (ATL/KATL) |
| New York-La Guardia Airport, NY (LGA/KLGA) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Accident investigation:
 |
|
Sources:
NTSB OPS11IA410
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 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] |
Corrections or additions? ... Edit this accident description
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