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Accident
Last updated: 22 October 2017
Estado:Final
Fecha:lunes 12 mayo 1997
Hora:15:29
Tipo:Silhouette image of generic A306 model; specific model in this crash may look slightly different
Airbus A300B4-605R
Operador:American Airlines
Registración: N90070
Numéro de série: 513
Año de Construcción: 1989-03-01 (8 years 2 months)
Motores: 2 General Electric CF6-80C2A5
Tripulación:Fatalidades: 0 / Ocupantes: 8
Pasajeros:Fatalidades: 0 / Ocupantes: 155
Total:Fatalidades: 0 / Ocupantes: 163
Daños en la Aeronave: Menor
Consecuencias: Repaired
Ubicación:cerca West Palm Beach, FL (   Estados Unidos de América)
Fase: Aproximación (APR)
Naturaleza:Vuelo Doméstico Programado
Aeropuerto de Salida:Boston-Logan International Airport, MA (BOS/KBOS), Estados Unidos de América
Aeropuerto de Llegada:Miami International Airport, FL (MIA/KMIA), Estados Unidos de América
Número de Vuelo:AA903
Descripción:
The flight was assigned an airspeed of 230 knots and cleared to descend from FL240 to 16,000 feet in preparation for landing at Miami. The FDR indicated that while the autopilot was engaged in the descent, the power levers moved from the mechanical autothrottle limit of 44 degrees to the manual limit of 37 degrees. As the aircraft leveled at 16,000 feet the airspeed decreased. The F/O began a right turn to enter a holding pattern and added some power, which stabilized the airspeed at 178 knots. However, the right bank and the resultant angle of attack (AOA) continued to increase, despite left aileron input by the autopilot. As the autopilot reached the maximum input of 20 degrees, bank angle increased past 50 degrees, and the AOA increased rapidly from 7 degrees to 12 degrees. At this point the stick shaker activated, the autopilot independently disconnected, the power was increased, and full left rudder was used to arrest the roll. The bank angle reached 56 degrees, and the AOA reached 13.7 degrees at 177 knots. The aircraft then pitched down, and entered a series of pitch, yaw, and roll maneuvers as the flight controls went through a period of oscillations for about 34 seconds. The maneuvers finally dampened and the crew recovered at approximately 13,000 feet. One passenger was seriously injured and one flight attendant received minor injuries during the upset.
An analysis showed that the forces during the upset not only had gone above the design limit of the vertical stabilizer, they also apparently had reached the ultimate limit. In June 1997, Airbus requested that American Airlines perform another inspection of the jet to ensure it was not damaged. American inspectors, following Airbus' instructions, examined the tail fin. But they did not use methods that would have allowed them to see inside the tail fin. They saw no damage from their visual inspection, and the jet continued to fly until an ultrasound inspection of the horizontal stabilizer was done in March 2002. The inspection found two crescent-shaped cracks at one of the points where the tail fin attaches to the fuselage. The fin was replaced.

Probable Cause:

PROBABLE CAUSE:"The flightcrew's failure to maintain adequate airspeed during leveloff which led to an inadvertent stall, and their subsequent failure to use proper stall recovery techniques. A factor contributing to the accident was the flightcrew's failure to properly use the autothrottle."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 9 months
Accident number: DCA97MA049
Download report: Summary report

Fuentes:
» NTSB
» USA Today 27-5-2003


Subsiguiente / acciones de seguridad

NTSB issued 5 Safety Recommendations

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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Boston-Logan International Airport, MA to Miami International Airport, FL as the crow flies is 2014 km (1259 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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