ERA21LA252
2021-06-14 · Sylva, North Carolina, United States · None · 1 aircraft · Status: Completed
Airport 24A
Aircraft involved
Probable cause & findings
The pilot’s intentional departure from the procedures published in the manufacturer’s flight training guide, and his subsequent loss of engine rpm, rotor rpm, and aircraft control.
Factual narrative
The pilot was demonstrating emergency procedures and non-standard maneuvers in the helicopter to a new hire pilot and a company sales representative. After several simulated engine failures and autorotations, the pilot initiated a “quick stop” maneuver. The maneuver he performed did not comport with the published procedure in the manufacturer’s flight training guide, and in some cases contradicted the factory guidance in the pilot’s admittedly “slightly modified maneuver.” The pilot initiated the maneuver about 40 ft. above the runway with about 40 knots airspeed. He reduced throttle, which was not directed, added left pedal, which was opposite of that directed, the engine and rotor rpm decayed, and the helicopter descended. The pilot said that he could not recover the engine or rotor rpm prior to the collision with the runway, which substantially damaged the helicopter. The 3 occupants of the helicopter egressed without injury. The pilot stated there were no mechanical deficiencies with the helicopter that would have prevented normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12
NTSB Findings
FAA avdata. C = Cause, F = Factor.
- — Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Powerplant parameters-Incorrect use/operation
- — Personnel issues-Task performance-Use of equip/info-Use of policy/procedure-Instructor/check pilot
- — Personnel issues-Task performance-Use of equip/info-Aircraft control-Instructor/check pilot
Verbatim from NTSB's published report. Source file
NTSB_2021_ERA21LA252.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 ↗
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Related research
Matched on aircraft type or causal vocabulary (engine failure). All research papers
- arXiv 2022 · arXiv preprint Multi-level Adaptation for Automatic Landing with Engine Failure under Turbulent Weather
This paper addresses efficient feasibility evaluation of possible emergency landing sites, online navigation, and path following for automatic landing under engine-out failure subject to turbulent wea…
- NASA NTRS 2019 · Conference Paper Simulation of Liquid Rocket Engine Failure Propagation Using Self-Evolving Scenarios
Traditional probabilistic risk assessment approaches often require failure scenarios to be explicitly defined through event sequences that are then quantified as part of the integrated analysis.
- NASA NTRS 2019 · Conference Paper Rocket engine failure detection using system identification techiques
The theoretical foundation and application of two univariate failure detection algorithms to Space Shuttle Main Engine (SSME) test firing data is presented.
- NASA NTRS 2019 · Conference Paper Rocket engine failure detection using system identification techniques
The theoretical foundation and application of two univariate failure detection algorithms to Space Shuttle Main Engine (SSME) test firing data is presented.
- NASA NTRS 2019 · Technical Memorandum (TM) A simulator investigation of engine failure compensation for powered-lift STOL aircraft
A piloted simulator investigation of various engine failure compensation concepts for powered-lift STOL aircraft was carried out at the Ames Research Center.
- Semantic Scholar 2019 · Article (AIAA Scitech 2019 Forum) Impact of Engine Failure Constraints on the Initial Sizing of Hybrid-Electric GA Aircraft
Potential advantages of hybrid-electric aircraft are fuel savings, lower emissions, and reduced noise. Since these aircraft generally apply multiple power sources, they can also be designed to sustain…