Loss of control Accident Airbus A300B4-605R N90070,
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Date:Monday 12 May 1997
Type:Silhouette image of generic A306 model; specific model in this crash may look slightly different    
Airbus A300B4-605R
Owner/operator:American Airlines
Registration: N90070
MSN: 513
Year of manufacture:1989
Engine model:General Electric CF6-80C2A5
Fatalities:Fatalities: 0 / Occupants: 163
Aircraft damage: Minor, repaired
Location:near West Palm Beach, FL -   United States of America
Phase: Approach
Nature:Passenger - Scheduled
Departure airport:Boston-Logan International Airport, MA (BOS/KBOS)
Destination airport:Miami International Airport, FL (MIA/KMIA)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
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:"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:
Investigating agency: NTSB
Report number: DCA97MA049
Status: Investigation completed
Duration: 2 years and 9 months
Download report: Final report


USA Today 27-5-2003

History of this aircraft

Other occurrences involving this aircraft
15 December 1997 N90070 American Airlines 0 Montego Bay, min

Revision history:


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