NTSB CAROL · Event
Event LAX99LA323
Registry · N628AW
FAA Aircraft Registry record.
Make / Model
PIPER PA-23-160
Year of manufacture
1959 · 40 years old at event
Engine
LYCOMING 0-320 SERIES (180 hp)
Seats / Engines
5 seats · 2 engines
Last airworthiness date
19590717
ADS-B equipped
Yes — Mode-S A8340A
Registrant of record
HOBART AVIATION INC
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
the failure of the injured passengers to remain seated with their seat belts fastened as directed by the captain.
Factual narrative
On September 16, 1999, at 2147 hours Pacific daylight time, an America West flight 2569, an Airbus A320-231, N628AW, encountered turbulence while on descent over Beatty, Nevada. The aircraft was not damaged; however, three flight attendants and seven passengers received minor injuries, while one passenger received serious injuries. The aircraft was being operated as a scheduled domestic passenger flight by America West Airlines, Inc., under the provisions 14 CFR Part 121, when the accident occurred. The flight originated in Seattle, Washington, at 1955. Visual meteorological conditions prevailed at the time and an IFR flight plan was filed. The captain reported that he was at flight level (FL) 250 about 40 miles DME southeast of the Beatty VHF omni-directional radio range (VOR). He had been deviating around thunderstorms while using his airborne radar to identify severe cells. It was a dark night and he had been unable to make visual contact with the severe weather. The turbulence encounter lasted about 5 seconds with one large "bump" that was accompanied by about a 100-foot altitude gain in less than 2 seconds. After the event, flight attendants reported injuries to several passengers. The captain then contacted the company's Las Vegas flight operations and requested that emergency medical equipment meet the aircraft at the gate. The captain stated that he had turned on the seat belt sign 45 minutes before the accident due to "light chop" that he had encountered earlier in the flight. He made a public address (PA) announcement in which he told the passengers to return to their seats and to fasten their seat belts. About 20 minutes prior to the accident, he directed the flight attendants to suspend service and to secure the cabin. Finally, he made one last PA announcement advising passengers that there was an increased chance of turbulence during the remainder of their flight. According to statements from two of the flight attendants, one or more of the injured passengers were out of the seats when the turbulence was encountered. Emergency medical personnel met the aircraft at the gate, transporting six passengers to area hospitals. The three flight attendants were treated by paramedics at the scene and released. Although they were offered medical attention, two of the eight injured passengers refused medical treatment. While descending toward the destination airport, the pilot was deviating around thunderstorms and using his airborne radar to identify severe cells. It was a dark night and he was unable to make visual contact with the severe weather. The captain turned on the seat belt sign 45 minutes before the accident due to 'light chop' that he had encountered earlier in the flight. He made a PA announcement in which he told the passengers to return to their seats and to fasten their seat belts. About 20 minutes prior to the accident, he directed the flight attendants to suspend service and to secure the cabin. Once again, he made a PA announcement advising passengers of the increased chance of turbulence during the remainder of the flight. The aircraft encountered turbulence that lasted a few seconds with one large 'bump' that was accompanied by a sudden altitude gain that lasted a couple of seconds. After the event, flight attendants reported injuries to several passengers. According to the flight attendants, one or more of the injured passengers were out of the seats at the time of the turbulence encounter. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1999_LAX99LA323.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (turbulence, thunderstorm). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- NASA NTRS 2019 · Contractor Report (CR)
An Examination of Aviation Accidents Associated with Turbulence, Wind Shear and Thunderstorm
The focal point of the study reported here was the definition and examination of turbulence, wind shear and thunderstorm in relation to aviation accidents.
- NASA NTRS 2019 · Reprint (Version printed in journal)
Observations of severe turbulence near thunderstorm tops
Data derived from the flight tapes of two airliners that experienced severe turbulence near thunderstorm tops are used to produce quantitative descriptions of the turbulence and its environment.
- NASA NTRS 2019 · Conference Proceedings
Operational evaluation of thunderstorm penetration test flights during project Storm Hazards '80
The National Aeronautics and Space Administration is conducting a research project called Storm Hazards '80 in order to study the prediction, detectability and avoidance of the hazards of severe storm…
- NASA NTRS 2019 · Reprint (Version printed in journal)
Severe Turbulence and Maneuvering from Airline Flight Records
Digital flight records from reported clear-air turbulence incidents are used to determine winds and turbulence, to determine maneuver g loads, and to analyze control problems.
- arXiv 2026 · arXiv preprint
Direct Numerical Simulations of Ice-Ocean Boundary Turbulence
Turbulent heat and freshwater transport at ice-ocean interfaces controls glacier and iceberg melt rates, yet the underlying physics remains poorly constrained.
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER)
Political Turbulence and Aviation Safety: A Cross-National Analysis of Political Stability's Effects on Aviation Accidents
To what extent does political stability affect aviation safety? This research aims to link domestic political conditions and public safety through the consideration of aviation accident frequency.
Browse the full corpus — academia portal ↗