United B772 near Tokyo on Jul 5th 2012, upset injures two cabin crew
Last Update: April 1, 2013 / 14:21:05 GMT/Zulu time
Incident Facts
Date of incident
Jul 5, 2012
Classification
Accident
Airline
United
Aircraft Registration
N224UA
Aircraft Type
Boeing 777-200
ICAO Type Designator
B772
It is highly probable that the accident occurred when the FA in the rear section of the aircraft was seriously injured because it was shaken heavily.
It is probable that the aircraft was shaken heavily because it was unable to avoid the cumulonimbus which had developed so rapidly, and then entered a part of the cloud.
It is probable that the FA was seriously injured because she was unable to hang onto the fixed objects around her when the aircraft was shaken suddenly.
The first officer (41, ATPL, 10,911 hours total, 2,901 hours on type) was pilot flying, the captain (58, ATPL, 15,404 hours total, 1,594 hours on type) was pilot monitoring, when the aircraft descended through FL230 approaching LIVET waypoint. A cumulonimbus clouds with its tops at about FL240-250 was just right of the track near LIVET, the weather radar showed green returns only and the cloud did not seem to develop. The crew initiated a slight left turn to avoid the cloud after receiving clearance from ATC to do so. The aircraft nonetheless entered the cloud at an area where the weather radar did not show any return, but encountered moderate turbulence, and exited the cloud about 5 seconds later again, but experienced two more jolts.
At the time of the turbulence encounter the fasten seat belt signs were illuminated, the flight attendants had not been briefed however to take their seats or expect turbulence.
Four flight attendants were working in the aft galley at the time of the turbulence encounter and lifted off the floor and thrown down onto the floor two times during the jolts resulting in one flight attendant receiving serious and the other three receiving minor injuries.
The JTSB analysed: "It is highly probable that the cumulonimbus the aircraft avoided had developed quickly immediately before the time of the accident. The PIC and the FO stated that the aircraft encountered turbulence when it just entered the cloud, and then it emerged from the cloud quickly. Therefore, it is probable that the aircraft took detour the cumulonimbus to avoid it, but was forced into a part of the cloud which had developed rapidly, and then encountered its disturbance."
Incident Facts
Date of incident
Jul 5, 2012
Classification
Accident
Airline
United
Aircraft Registration
N224UA
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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