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NTSB Report
July 14, 1990 · Boeing 747-136 · GAWNL
Miami, FL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 14, 1990
Injury Outcomes
20 injuries (2 serious injuries, 18 minor injuries), 363 uninjured
Location
Miami, FL
Aircraft
Boeing 747-136
Tail Number
GAWNL
Operator
British Airways
Injuries
Serious
NTSB Number
MIA90LA152
FLT ENCOUNTERED SEVERE TURBULENCE WHILE DESCENDING THROUGH 12,300 FEET ON APPROACH TO MIAMI INTERNATIONAL AIRPORT. WEATHER STUDIES INDICATED THE AIRCRAFT WAS IN AT LEAST MODERATE THUNDERSTORM ACTIVITY AND NEAR AN AREA OF VERY HEAVY OR LEVEL 4 ACTIVITY. FLIGHT RECORDER DATA INDICATED PEAK G FORCES WERE ENCOUNTERED 40 SECONDS AFTER TURBULENCE ENCOUNTER. PEAK G FORCES WERE FROM 1.5 TO -0.5 G OVER A THREE SECOND PERIOD.
NTSB Probable Cause
THE INADVERTENT ENCOUNTER WITH SEVERE TURBULENCE WHILE OPERATING IN AN AREA OF THUNDERSTORM ACTIVITY.
Full Narrative
FLT ENCOUNTERED SEVERE TURBULENCE WHILE DESCENDING THROUGH 12,300 FEET ON APPROACH TO MIAMI INTERNATIONAL AIRPORT. WEATHER STUDIES INDICATED THE AIRCRAFT WAS IN AT LEAST MODERATE THUNDERSTORM ACTIVITY AND NEAR AN AREA OF VERY HEAVY OR LEVEL 4 ACTIVITY. FLIGHT RECORDER DATA INDICATED PEAK G FORCES WERE ENCOUNTERED 40 SECONDS AFTER TURBULENCE ENCOUNTER. PEAK G FORCES WERE FROM 1.5 TO -0.5 G OVER A THREE SECOND PERIOD.
Flight
Event TypeAccident
Event Time15:49 EDT
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 747-136
Tail NumberGAWNL
Aircraft CategoryAir
OperatorBritish Airways
Operating RulePart 129
Engines4
Engine TypeTurbofan
Engine DetailsP&W · JT9D-7 · Turbofan
People & Injuries
Injury Summary20 injuries (2 serious injuries, 18 minor injuries), 363 uninjured
Fatal0
Serious2
Minor18
Uninjured363
Total383
Crew 1Age 43 · First Class
Conditions
ConditionsIMC
LightDaylight
Wind330° @ 10 kt
Visibility7 sm
CeilingBroken clouds 15000 ft
Temperature / Dew Point70 F
Altimeter30.00 inHg
Observation Time19:50
Weather SourceWIT