American B772 near New York on Jan 20th 2011, near collision with USAF C-17s

Last Update: November 6, 2012 / 11:45:42 GMT/Zulu time

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Incident Facts

Date of incident
Jan 20, 2011

Classification
Incident

Cause
Near collision

Airline
American Airlines

Aircraft Type
Boeing 777-200

ICAO Type Designator
B772

The NTSB released their factual report stating a miscommunication between the civil air traffic controller working New York ARTCC sector 86 and the military controller controlling the two C-17s also within New York's sector 86 permitted the Boeing 777 to be cleared to FL220 while the C-17s were cleared to descend from FL250 to FL220.

The conflict was indicated by a collision alert issued by the civil radar to both controllers. The conflict alert activated at the same time when AA-951 received TCAS resolution advisories and the C-17s, configured to receive traffic advisories only, received traffic advisories. AA-951 received a TCAS RA to descend followed by a second RA in quick succession now requiring the crew to climb. The C-17s did not change their trajectory.

The closest distance between AA-951 and the closest C-17s was 0 feet vertical and 0.38nm horizontally.

The NTSB reported the second C-17 followed the first C-17 about 4000 feet behind and 500 feet to the right of the first aircraft.

On Nov 6th 2012 the NTSB released their final report concluding:

Incomplete and incorrect coordination between air traffic controllers that resulted in the 777 and the two C17s being cleared to maintain the same altitude. Contributing to the incident was the controllersÂ’ non-adherence to established communications phraseology and incorrect data entry into the radar data blocks for each aircraft.
Incident Facts

Date of incident
Jan 20, 2011

Classification
Incident

Cause
Near collision

Airline
American Airlines

Aircraft Type
Boeing 777-200

ICAO Type Designator
B772

This article is published under license from Avherald.com. © of text by Avherald.com.
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