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| Date: | Wednesday 4 March 1998 |
| Time: | 14:15 LT |
| Type: |  Boeing 737-242C |
| Owner/operator: | Alaska Airlines |
| Registration: | N746AS |
| MSN: | 23123/1042 |
| Year of manufacture: | 1984 |
| Total airframe hrs: | 40001 hours |
| Engine model: | P&W JT8D-17 |
| Fatalities: | Fatalities: 0 / Occupants: 116 |
| Aircraft damage: | None |
| Category: | Accident |
| Location: | Reno, NV -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Seattle, WA (KSEA) |
| Las Vegas, NV (KLAS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The fight encountered severe clear air turbulence en route at flight level 350 and diverted to Reno, Nevada.. There were no reports of clear air turbulence from other pilots nor was it forecasted. The seat belt signs were off at the time. A review of the flight data recorder indicated that, for the period involved, vertical acceleration (Nz) varied from 1g to 1.5g to -0.07g to 1.3g to 0.86g over a 6-second period. The recorded data also indicated that atmospheric stability existed at flight level 350 several minutes prior to the turbulent onset. There was little or no warning given to the flight crew of the impending turbulent conditions.
Probable Cause: Unforecasted and sudden encounter with clear air turbulence when passengers and flight attendants were not secured in their seats.
Accident investigation:
 |
|
Sources:
NTSB LAX98LA104
History of this aircraft
Other occurrences involving this aircraft
| 13 February 1991 | N672MA | Markair | 0 | Unalaska, AK | |
min |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2024 17:52 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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