ANA B763 near Tokyo on Apr 27th 2011, turbulence injures 5
Last Update: July 1, 2012 / 16:41:17 GMT/Zulu time
Incident Facts
Date of incident
Apr 27, 2011
Classification
Accident
Cause
Turbulence
Aircraft Type
Boeing 767-300
ICAO Type Designator
B763
the sudden disturbance of atmosphere causing an upset to the aircraft, during which caused a flight attendant to first float in the cabin then fall to the aircraft floor resulting in a serious injury.
The disturbance was caused by a local windshear in the vicinity of a lower frontal system's jet stream. It is considered likely a temporary clear air turbulence occurred.
The captain (41, ATPL, 8,410 hours total, 5,740 hours on type) was pilot flying, the first officer (55, ATPL, 7,633 hours total, 1,388 hours on type) was pilot monitoring. The aircraft had encountered some turbulence during the early stages of the flight at FL250 and FL270, the captain had therefore announced that seat belts should be fastened at all times, service had been interrupted and flight attendants were ordered to be seated, and the flight became smooth and cabin crew was released to perform service with care. About 12 minutes later the aircraft climbed to FL290, the fasten seat belt signs were turned off and an announcement made by the captain. 3 minutes after reaching FL290 the aircraft was instructed to descend to FL250, during the descent the first officer noticed windshear and the lack of echos on weather radar. 2 minutes after levelling off at FL250 the captain ordered cabin crew to stop service. About 5 minutes later the selected airspeed was reduced from 320 to 300 knots, another 30 seconds later the computed windspeed changed rapidly from 10 to 50 knots within 7 seconds with a change of wind direction of about 5 degrees, the outside air temperature rapidly dropped then increased, the thrust levers moved, the cockpit voice recorder recorded impact sounds, the flight data recorder stored a vertical acceleration of -0.34G, the pitch attitude began to increase, the aircraft lost about 80 feet of altitude, the fasten seat belt signs were illuminated, and the aircraft stabilized again. The first officer reported moderate turbulence to air traffic control and requested a descent to FL230, which was approved.
While on approach descending through FL170 about 14 minutes later the cabin crew reported the status in the cabin prompting the flight crew to request ambulances and a wheelchair at the gate via the company frequency.
The aircraft landed at Haneda Airport about 51 minutes after the turbulence encounter.
Cabin crew reported they felt the aircraft "float" and began to check the cabin. The flight attendant positioned at L2 checked the rear lavatory when she lifted off the floor, hit her head and then fell down onto her buttock describing that event like an earthquake. She felt back pain and was relieved from duties. An initial examination at the hospital raised suspicion of an avulsion fracture of the right pubic bone, which was confirmed on May 2nd.
2 other flight attendants and 2 passengers received minor injuries, mainly bruises.
Incident Facts
Date of incident
Apr 27, 2011
Classification
Accident
Cause
Turbulence
Aircraft Type
Boeing 767-300
ICAO Type Designator
B763
This article is published under license from Avherald.com. © of text by Avherald.com.
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