LAX93LA220
1993-05-21 · VACAVILLE, California, United States · None · 1 aircraft · Status: Completed
Airport O45
Current FAA registration · N9461P
- Make / Model
- PIPER PA-18-150
- Year of manufacture
- 1975 · 18 years old at event
- Engine
- LYCOMING 0-320 SERIES (180 hp)
- Seats / Engines
- 2 seats · 1 engine
- Last airworthiness date
- 19750909
- ADS-B equipped
- Yes — Mode-S AD25FB
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
the pilot's failure to maintain directional control after encountering strong and gusty cross winds during the landing flare.
Factual narrative
On May 21, 1993, at about 1335 hours Pacific daylight time, a Piper PA18 150, N9461P, ground looped and nosed over on landing at the Nut Tree airport, Vacaville, California. Visual meteorological conditions prevailed at the time and no flight plan was filed. The aircraft incurred substantial damage. The certificated private pilot was not injured. The local area pattern practice flight originated at Vacaville, California, on the day of the mishap at about 1300 hours. An FAA inspector witnessed the accident. He reported that the aircraft was landing on runway 20 with a right 45 degree cross wind he estimated at 14 knots with higher gusts to about 17 knots. Shortly after touchdown, the aircraft ground looped and nosed over. The inspector stated that he routinely flies into and out of the airport, and, due to some trees bordering the airport, the wind conditions can sometimes be highly variable with wind shears and vortex situations. The FAA inspector reported that he examined the pilot's logbook. All of the pilot's flight time was accrued in tail wheel aircraft. An FAA inspector witnessed the accident and reported that the aircraft was landing with a right 45 degree cross wind he estimated at 14 knots with higher gusts to 17 knots. Shortly after touchdown, the aircraft ground looped and nosed over. The inspector stated that he routinely flies into and out of the airport, and, due to some trees bordering the airport, the wind conditions can sometimes be highly variable with wind shears and vortex situations. All of the pilot's flight time was accrued in tail wheel aircraft. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1993_LAX93LA220.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
Search this event elsewhere
External sources are reported, not agency: signal that something happened, not fact about what happened.
- TallyAero Live Wire Aviation press
- NTSB CAROL Agency ↗
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Related research
Matched on aircraft type or causal vocabulary (wind shear). All research papers
- NASA NTRS 2019 · Conference Paper Optimal recovery from microburst wind shear
The flight path of a twin-jet transport aircraft is optimized in a microburst encounter during approach to landing. The objective is to execute an escape maneuver that maintains safe ground clearance …
- 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 · Conference Paper Analysis of extreme wind shear
New methods utilizing extreme value statistical theory are applied in the analysis of the largest wind component shear in a wind profile as a function of shear layer thickness and season.
- NASA NTRS 2019 · Technical Memorandum (TM) Probabilities of zero wind shear phenomena based on Rawinsonde data records
Probabilities of zero wind shear occurence and depth based on rawinsonde data records
- NASA NTRS 2019 · Contractor Report (CR) A Wind Shear Mechanism for Producing Sporadic E by Concentrating Minor Meteoric Ions
Wind shear mechanism for producing sporadic E layer by concentrating minor meteoric ions
- NASA NTRS 2019 · Technical Memorandum (TM) Some aspects of wind shear in the upper atmosphere
Hydrodynamic turbulence and wind shear in upper atmosphere