# NTSB MIA90LA152: Boeing 747-136, Miami, FL, July 14, 1990

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Limited investigation · Final report
- Date: July 14, 1990, 15:49 local (19:49 UTC)
- Place: Miami, FL
- Location: 25.7743° N, 80.1937° W: Placed by OpenAirDocs: center of Miami, FL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=25.7743&lon=-80.1937&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious, 18 minor, 363 uninjured
- Status: Completed, report November 23, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 32679
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA90LA152
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/32679/pdf
- Page: https://openairdocs.org/ntsb/MIA90LA152

## Probable cause

THE INADVERTENT ENCOUNTER WITH SEVERE TURBULENCE WHILE OPERATING IN AN AREA OF THUNDERSTORM ACTIVITY.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- In flight encounter with weather, descent - normal
  - weather condition - turbulence(thunderstorms) (cause)

## Analysis

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.

## Aircraft

- Registration: GAWNL (not matched to a registry record)
- Reported make and model: BOEING 747-136
- Category: Airplane
- Airframe hours: 9113
- Engines: P&W JT9D-7 turbo fan
- Damage: No damage
- Flight: Part 129
- Operator: British Airways
- Registered owner: British Airways, Inc
- Airworthiness certificate: Standard, Transport
- Last inspection: AAIP, July 3, 1990, 154 hours before
- Departed: EGLL, LONDON, OF
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; foreign, airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, unknown; seat: left

## Weather

- Conditions: Instrument (IMC), Day
- Wind: 330° at 10 knots
- Visibility: 7 statute miles
- Lowest ceiling: 15,000 ft broken
- Temperature: 73 °F, dew point 70 °F
- Altimeter: 30.00 inHg
- Observed at: MIA, 20 nm away

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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