Incident Overview

Date: Saturday 12 December 2015
Aircraft Type: Boeing 777-223ER
Owner/operator: American Airlines
Registration Number: N784AN
Location: ca 250 nm W of Buenos Aires, BA – ÿ Argentina
Phase of Flight: En route
Casualties: Fatalities: 0 / Occupants:
Component Affected: Flight crew and aircraft systems (specifically, the aircraft’s navigation and control systems due to the turbulence).Flight crew and aircraft systems (specifically, the aircraft’s navigation and control systems due to the turbulence).
Investigating Agency: NTSBNTSB
Category: Accident
Narrative
On December 12, 2015, American Airlines flight AA997 experienced turbulence enroute to Ministro Pistarini International Airport, Buenos Aires, Argentina (EZE). The aircraft, a Boeing 777, N784AN, deviated north of the planned routing to avoid a severe convective area near thunderstorms. The flight crew advised the flight attendants (FA) that turbulence was expected within 15 minutes, and they should be seated. While securing the galley, the aircraft encountered intense turbulence, resulting in one FA being thrown to the floor and sustaining a broken arm. There were no passenger injuries or damage to the airplane.On December 12, 2015, American Airlines flight AA997 experienced turbulence enroute to Ministro Pistarini International Airport, Buenos Aires, Argentina (EZE). The aircraft, a Boeing 777, N784AN, deviated north of the planned routing to avoid a severe convective area near thunderstorms. The flight crew advised the flight attendants (FA) that turbulence was expected within 15 minutes, and they should be seated. While securing the galley, the aircraft encountered intense turbulence, resulting in one FA being thrown to the floor and sustaining a broken arm. There were no passenger injuries or damage to the airplane.

Description

On December 12, 2015, American Airlines flight AA997, a Boeing 777, N784AN, encountered turbulence enroute to Ministro Pistarini International Airport, Buenos Aires, Argentina (EZE) during a regularly scheduled passenger flight from Dallas-Fort Worth International Airport (DFW), Dallas, Texas.ÿ The aircraft was approximately 250 NM from EZE and deviating north of the filed routing to avoid a strong convective area near thunderstorms.ÿ The flight crew had advised the flight attendants (FA) that the flight could encounter turbulence in approximately 15 minutes and they should be seated.ÿ The fasten seatbelt sign was on.ÿ While two FA’s were securing the galley, the flight encountered the region of strong/severe turbulence earlier than expected.ÿ One FA was thrown to the floor and fell resulting in a broken arm.ÿ There were no passenger injuries and no damage to the airplane. The JIAIAC of Argentina delegated the investigation to the NTSB, who accepted the delegation. Probable Cause: an inadvertant encounter with convective turbulence.

Primary Cause

Inadvertant encounter with convective turbulence.Inadvertant encounter with convective turbulence.

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