NYC99LA191
1999-08-01 · FREDERICK, Maryland, United States · None · 1 aircraft · Status: Completed
Airport FDK
Current FAA registration · N70894
- Make / Model
- PIPER J3C-65
- Year of manufacture
- 1946 · 53 years old at event
- Engine
- CONT MOTOR A&C65 SERIES (65 hp)
- Seats / Engines
- 2 seats · 1 engine
- Last airworthiness date
- 19560710
- ADS-B equipped
- Yes — Mode-S A975F6
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
The pilot's failure to maintain directional control. Contributing factors were gusty wind conditions and the sign.
Factual narrative
On August 1, 1999, at 1440 eastern daylight time, a Piper J3C-65, N70894, was substantially damage during landing, when it departed the right side of runway 23 at Frederick Municipal Airport, Frederick, Maryland. The certificated commercial pilot was not injured. Visual meteorological conditions prevailed for the personal flight that originated from Haysfield Airport, Clarksville, Maryland. A visual flight rules flight plan was filed, and the flight was conducted under 14 CFR Part 91. According to the Pilot/Operator Aircraft Accident Report Form, the pilot obtained a standard weather briefing, and then filed a flight plan. He then received a weather update from flight service approximately 5 minutes before executing the flight. During the update, the briefer indicated that scattered thunderstorms in the Hagerstown, Maryland area were moving east towards Frederick. The pilot calculated that he would arrive at his destination prior to the thunderstorms, so he departed Haysfield. While approaching his destination, the pilot noticed the sky to the north of his position was "very dark." He also experienced an increase in turbulence. The pilot checked weather with Frederick UNICOM, and was advised the winds were 4 knots. With the approaching thunderstorms, the pilot expedited his turn from base to final for runway 23. He then executed a "normal" landing. As the airplane was rolling out it became airborne and started to drift to the right. The airplane touched down, exited the runway, and the landing gear collapsed when it struck a sign. The pilot shut off both magnetos, secured the throttle, and exited the airplane. The pilot added, "I think I encountered a gust and simply lost control." The pilot obtained a standard weather briefing, and then filed a flight plan. He then received a weather update from flight service approximately 5 minutes before executing the flight. During the update, the briefer indicated that scattered thunderstorms in the Hagerstown area were moving east towards Frederick. The pilot calculated that he would arrive at his destination prior to the thunderstorms, so he departed. While approaching his destination, the pilot noticed the sky to the north of his position was 'very dark.' He also experienced an increase in turbulence. The pilot checked weather with Frederick UNICOM, and was advised the winds were 4 knots. With the approaching thunderstorms, the pilot expedited his turn from base to final, and executed a 'normal' landing. As the airplane rolled out it became airborne and started to drift to the right. The airplane touched down, exited the runway, and the landing gear collapsed when it struck a sign. The pilot shut off both magnetos, secured the throttle, and exited the airplane. The pilot stated, 'I think I encountered a gust and simply lost control.' Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1999_NYC99LA191.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
Search this event elsewhere
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Related research
Matched on aircraft type or causal vocabulary (turbulence, thunderstorm). All research papers
- 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.
- arXiv 2025 · arXiv preprint Explainable LiDAR 3D Point Cloud Segmentation and Clustering for Detecting Airplane-Generated Wind Turbulence
Wake vortices - strong, coherent air turbulences created by aircraft - pose a significant risk to aviation safety and therefore require accurate and reliable detection methods.