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The aircraft was engaged on a scheduled international passenger flight. Between Narita and Guam the aircraft weather radar was used to avoid unforecast, isolated cumulonimbus cloud formations. Approaching Guam, the flight conditions were smooth with the aircraft flying through cirrus cloud. The Captain and Second Officer, who were on duty on the flight deck, were monitoring the weather radar. A heading change to the right of track was required to avoid weather activity observed by radar over the island. Whilst regaining track, the aircraft encountered an area of severe turbulence lasting for approximately 30 seconds and resulting in vertical accelerations of +1.8G and -0.4G. Forty passengers and two cabin attendants were injured. At the time of the encounter the seat belt signs were off and most of the injured passengers were asleep with their seat belts undone. The Captain illuminated the seat belt sign immediately the turbulence was noticed. The injured were treated by the cabin crew and a passenger who was a qualified medical practitioner. The Captain was advised that none of the injured required immediate specialised treatment and, as the aircraft did not sustain any significant damage, he decided to continue the flight to Sydney. The airline company was notified and the aircraft was met by medical staff on arrival. Twenty eight passengers and cabin crew were conveyed to hospital for further treatment. It was determined the aircraft had encountered an area of turbulence associated with cumulonimbus cloud which was not detected by the aircraft weather radar. Although the seat belt signs were not illuminated, passengers were advised during an after take off announcement, to keep their seat belts fastened when seated. These announcements were made in English and Japanese languages.

Download Final Report
[ Download PDF: 23KB]
General details
Date: 02 August 1987 Investigation status: Completed 
Location:16kms south of the coast of Guam Investigation type: Occurrence Investigation 
State: International  
Release date: 13 January 1992 Occurrence class: Environment 
Report status: Final Occurrence category: Accident 
 Highest injury level: Serious 
Aircraft details
Aircraft manufacturer: The Boeing Company 
Aircraft model: 747 
Aircraft registration: VH-EBT 
Serial number: 23222 
Type of operation: Air Transport High Capacity 
Damage to aircraft: Minor 
Departure point:Narita JAPAN
Departure time:2155,(1 Aug 87)
Destination:Sydney NSW
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Last update 09 May 2016