NTSB Identification: CHI86FA096.
The docket is stored on NTSB microfiche number 33953.
Scheduled 14 CFR operation of UNITED AIRLINES
Accident occurred Monday, March 03, 1986 in HONOLULU, HI
Probable Cause Approval Date: 01/25/1988
Aircraft: BOEING 747-122, registration: N4729U
Injuries: 2 Serious,7 Minor,331 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE SCHEDULED PASSENGER FLIGHT FROM HONOLULU TO CHICAGO ENCOUNTERED CLEAR AIR TURBULENCE (CAT) ABOUT 500 NM EAST OF HONOLULU WHILE IN CRUISE FLIGHT AT FLIGHT LEVEL 330. THE TURBULENCE WAS UNEXPECTED, HAD NOT BEEN FORECAST, AND THE FASTEN SEAT BELT WAS NOT ILLUMINATED. TWO PASSENGERS WERE SERIOUSLY INJURED DURING THE TURBULENCE ENCOUNTER. THE FLIGHT THEN CONTINUED TO THE DESTINATION AIRPORT WITHOUT FURTHER INCIDENT.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

WEATHER CONDITION..TURBULENCE,CLEAR AIR

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