NTSB CAROL · Event
Event BFO94LA035
Aircraft involved
Probable cause & findings
THE PILOT'S FAILURE TO MAINTAIN ROTOR RPM WHICH LED TO AN IN FLIGHT LOSS OF CONTROL RESULTING IN A COLLISION WITH THE RUNWAY AND THE HELICOPTER ROLLING OVER ON ITS SIDE. A FACTOR IN THIS ACCIDENT WAS THE PILOT'S LACK OF TOTAL EXPERIENCE FLYING HELICOPTERS.
Factual narrative
On January 25, 1994 about 1605 hours eastern standard time, a Robinson R-22A, N8559A entered an uncontrolled descent from hovering flight, collided with the runway, and rolled over at Gaithersburg Airport, Gaithersburg, Maryland. The helicopter sustained substantial damage and the certificated private pilot was not injured. The local area instructional flight was being operated by Montgomery Aviation, Limited at the time. Visual meteorological conditions prevailed and a flight plan was not filed. According to an FAA safety inspector, at the time of the accident, the pilot had a private pilot certificate with a single engine airplane rating. The pilot was in the process of being trained to fly helicopters and did not have a helicopter rating. The FAA safety inspector examined the helicopter after the accident and did not find any pre-existing anomalies. In his written statement, the pilot said that during his supervised solo flight, he made his fourth approach to the runway and then began to hover the helicopter. He said the low RPM warning light illuminated and he "...rolled throttle and lowered collective, nose yawed left and gained altitude. Lowered collective (I believe) and left skid touched ground. Bounced on both skids and returned on ground on left skid. Then started dynamic rollover." Neither the pilot nor the operator reported any pre-existing deficiencies for the helicopter prior to the accident. The pilot was in the process of being trained to fly helicopters and did not have a helicopter rating. The pilot had accumulated about 19 hours of total helicopter flight time when the accident occurred. He did possess a private pilot fixed wing certificate at the time of the accident. The pilot was performing a supervised solo and was hovering over the runway at the termination of his fourth approach. He said the low RPM light illuminated and he lowered the collective. He lost control of the helicopter and it descended to the runway. The helicopter bounced on both skids and returned to the runway. The helicopter's left skid contacted the runway and the helicopter rolled over. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1994_BFO94LA035.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
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Academic papers and agency reports matching this event's aircraft type or causal vocabulary (loss of control). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- 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.
- 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.
- NASA NTRS 2021 · Conference Paper
Use of Design of Experiments in Determining Neural Network Architectures for Loss of Control Detection
We describe empirical methods for selecting a neural network architecture to implement belief state inference on generic commercial transport aircraft.
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