FTW98LA400
1998-09-17 · ARDMORE, Oklahoma, United States · None · 1 aircraft · Status: Completed
Airport 1F0
Aircraft involved
Probable cause & findings
The pilots failure to maintain clearance with terrain and the ensuing loss of control.
Factual narrative
On September 17, 1998, at 0915 central daylight time, a Bell 47-G-2 helicopter, N1575, was substantially damaged following a loss of control while hovering at the Ardmore Downtown Executive Airport near Ardmore, Oklahoma. The solo student pilot was not injured. The helicopter was owned and operated by Versatile Helicopters Inc., of Ardmore, Oklahoma. Visual meteorological conditions prevailed and no flight plan was filed for the Title 14 CFR Part 91 local training flight which originated at 0825. During an interview conducted by the FAA inspector, the operator of the helicopter said that during a takeoff to hover, the heals of the skids "sunk into the sod and brought the aircraft back, striking the tail rotor blades on the ground." The operator added that "one of the tail rotor blades departed the hub." The pilot stated that after the tail rotor hit, the helicopter "raised off the ground and started spinning to the right." The student pilot added that he, "attempted to level the helicopter by lowering the collective to bring the helicopter to the ground." The helicopter "hit the ground with the left skid and rolled over on to its left side." Winds at the time of the accident were reported to be calm. Examination of the aircraft by the FAA inspector revealed that the tailboom was destroyed, the cabin sustained structural damage and both main rotor blades were damaged. The student pilot had accumulated approximately 41 hours in the helicopter and was on his seventh solo flight at the time of the accident. The solo student pilot lost control of the aircraft after the tail rotor contacted the ground. Witnesses to the accident saw the aircraft spin around to the right after the tail rotor hit the ground. When the student pilot attempted to set the aircraft back down, the helicopter rolled on to its side. The winds at the time of the accident were reported to be calm. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1998_FTW98LA400.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 ↗
- NTSB Docket Agency ↗
- Aviation Safety Network Aviation press ↗
- Kathryn's Report Aviation press ↗
- Aviation Herald Aviation press ↗
- AVweb Aviation press ↗
- Pilots of America Community ↗
- Reddit /r/flying Community ↗
- FlightAware Aviation press ↗
- AOPA accident database Aviation press ↗
- Google News News ↗
- DuckDuckGo News ↗
Related research
Matched on aircraft type or causal vocabulary (loss of control). All research papers
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER) A Scoping Review of Aviation Loss of Control Inflight Research
Loss of control – inflight (LOC-I) contributes to aircraft accidents at unacceptably high rates. Significant industry efforts and research have aimed to improve LOC-I prevention, detection, and recove…
- SKYbrary (Eurocontrol) 2024 · SKYbrary article Loss of Control In-Flight (LOC-I) — SKYbrary Knowledge Base
SKYbrary comprehensive knowledge-base entry on Loss of Control In-Flight — definitions, contributing factors, accident case studies (Air France 447, Colgan 3407), and prevention strategies.
- Semantic Scholar 2024 · Article (International Conference on Networking and Services) Risk Assessment of Loss of Control In-Flight Trajectories for Urban Air Mobility Safety
In Urban Air Mobility (UAM), maintaining a minimum separation between aircraft is a safety requirement, which becomes challenging amidst congested air traffic and off-nominal conditions, such as Loss …
- NTSB Aircraft Accident Reports 2022 · Accident report Loss of Control on Takeoff in Icing Conditions — Citation 560XL
Cessna Citation 560XL fatal takeoff icing accident, March 2018. Investigation of a Citation 560XL loss-of-control takeoff accident in icing conditions.
- Semantic Scholar 2021 · Article (Aviation) ANALYSIS OF GENERAL AVIATION FIXED-WING AIRCRAFT ACCIDENTS INVOLVING INFLIGHT LOSS OF CONTROL USING A STATE-BASED APPROACH
Inflight loss of control (LOC-I) is a significant cause of General Aviation (GA) fixed-wing aircraft accidents. The United States National Transportation Safety Board’s database provides a rich source…
- NASA NTRS 2021 · Presentation Use of Design of Experiments in Determining Neural Network Architectures for Loss of Control Detection
Abstract—We describe empirical methods for selecting a neural network architecture to implement belief state inference on generic commercial transport aircraft.