ASN Wikibase Occurrence # 355575
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| Date: | Thursday 10 July 1997 |
| Time: | 15:41 LT |
| Type: |  Boeing 757-223 |
| Owner/operator: | American Airlines |
| Registration: | N660AM |
| MSN: | 25294/418 |
| Year of manufacture: | 1991 |
| Total airframe hrs: | 17466 hours |
| Engine model: | Rolls-Royce RB211-53-5E4B |
| Fatalities: | Fatalities: 0 / Occupants: 155 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Dickinson, ND -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Seattle, WA (KSEA) |
| New York, NY (KJFK) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane was in level cruise flight at FL370, flying in an area of widely scattered thunderstorm cells. The airborne weather radar was set to the 160 nm scale, and the tilt was approximately 1 to 2 degrees down. One cell was observed 20 nm to the left of the airplane towering above its altitude, a second cell was 40 nm to the right, and a third cell 'came up independently underneath' and in front of the airplane. The FASTEN SEATBELT sign was not illuminated, but earlier, the captain had delivered an address to the passengers advising them of the possibility of a bumpy ride ahead and to '...keep your seatbelts on while in your seats.' The flight encountered convection induced turbulence (CIT), which resulted in minor injuries to 20 passengers and 2 flight attendants. There were no injuries to the other 120 passengers and 5 crew members. Vertical acceleration was between 2.01 and -0.75 g's. American Airlines meteorologists prepared the flight plan and entered a turbulence index of '0' for that segment of flight (from Billings, Mt, to Dupree, SD), indicating smooth air on average for the segment. Convective activity had been forecast for the area.
Probable Cause: an encounter with unforecast convection induced turbulence (CIT). Related factors were: the flight crew's improper evaluation of the weather, and an inaccurate preflight weather briefing by company weather personnel.
Accident investigation:
 |
|
Sources:
NTSB FTW97IA261
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 13:27 | ASN Update Bot | Added |
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