NTSB CAROL · Event
Event ERA20LA192
Aircraft involved
Probable cause & findings
A failure of the left main landing gear scissors, which resulted in a landing gear collapse following a precautionary landing with the landing gear in an intermediate position..
Factual narrative
On May 18, 2020, about 1110 central daylight time, a Beech F90, N960V, was substantially damaged when it was involved in an accident near McGhee Tyson Airport (TYS), Knoxville, Tennessee. The pilot and pilot-rated passenger were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 corporate flight. According to the pilot, after takeoff from TYS, he moved the landing gear handle to the retract position; afterward, the red “gear unsafe” light illuminated. The pilot returned to the airport and conducted a low-altitude approach so that an airport tower controller could visually confirm the landing gear position. The tower controller reported that the nose landing gear appeared “slanted like it wasn’t down and locked.” The pilot performed the unsafe gear checklist and attempted to manually lower the landing gear, but the red gear unsafe light remained illuminated. During a subsequent low-altitude approach, the controller indicated that the main gear appeared down but that the nose gear did not appear to be fully down and locked. The pilot conducted another low-altitude approach and was told that the gear condition had not changed. He then elected to perform a precautionary landing. Shortly after touchdown, the main and nose landing gear collapsed. The airplane departed the left side of the runway and came to rest on a taxiway. Examination of the airplane revealed that several stringers and ribs were impact damaged, the nose landing gear actuator punctured the top of the fuselage, and the left aileron was impact damaged. Examination of the left main landing gear revealed that the landing gear scissors had fractured at the bolt attachment area and that the landing gear was twisted sideways and jammed against the main landing gear doors. The landing gear circuit breaker that controlled the landing gear motor had popped. Examination of the landing gear handle revealed that the emergency engage handle was not placed in the STOP detent, the position indicated in the landing gear manual extension procedures in the pilot’s operating handbook. A review of the operator’s maintenance records revealed that. on February 6, 2020, the airplane underwent a landing gear overhaul. At the time of the overhaul, the airplane had accumulated a total of 12,512 hours. At the time of the accident, the airplane had a total time of 12,533 hours During the 21 hours that the airplane flew between the landing gear overhaul and the accident, no reports of any mechanical irregularity were documented. Shortly after takeoff, the pilot moved the landing gear handle to the retract position, and the red “gear unsafe” light illuminated. The pilot conducted a low-altitude approach so that the tower controller could visually confirm the condition of the landing gear; the tower controller reported that the nose landing gear appeared “slanted.” The pilot then performed the unsafe gear checklist and attempted to manually lower the landing gear, but the red gear unsafe light remained illuminated. During a subsequent low-altitude approach, the controller indicated that the main gear appeared down but that the nose gear did not appear to be fully down and locked. The pilot performed a precautionary landing, and, shortly after touchdown, the main and nose landing gear collapsed, and the airplane skidded to a stop. Examination of the left main landing gear revealed that the landing gear scissors had fractured at the bolt attachment area and that the landing gear was twisted sideways and jammed against the main gear doors. The landing gear circuit breaker that controlled the landing gear motor had popped. The airplane manufacturer’s landing gear manual extension procedure required the emergency gear selector handle to be in the STOP detent. Postaccident examination of the airplane revealed that the handle was not placed in the STOP detent; however, it could not be determined, from the available evidence for this investigation, if the landing gear manual extension procedure could have been successfully accomplished with the landing gear system failure that occurred during the accident flight. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12
NTSB Findings
Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).
- C Aircraft-Aircraft systems-Landing gear system-Landing gear actuator-Damaged/degraded
- — Aircraft-Aircraft systems-Landing gear system-Gear extension and retract sys-Damaged/degraded
Verbatim from NTSB's published report. Source file
NTSB_2020_ERA20LA192.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (maintenance). 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 2026 · Journal article (IJAAA)
From Reactive to Predictive: A hybrid Trust-Mediated Adoption Framework for Data-Driven Maintenance in Distributed-Authority Aviation Environments
Modern aviation maintenance operates within increasingly data-intensive technological environments, yet the operational integration of predictive maintenance into routine decision-making remains incon…
- Semantic Scholar 2025 · Article (Applied Sciences)
Decision-Making Framework for Aviation Safety in Predictive Maintenance Strategies
The implementation of predictive maintenance (PM) in aviation presents unique challenges due to strict safety requirements, complex operational environments, and regulatory constraints.
- Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER)
Low-Resource Automatic Speech Recognition Domain Adaptation – A Case-Study in Aviation Maintenance
With timeliness and efficiency being critical in the aviation maintenance industry, the need has been growing for smart technological solutions that optimize and streamline the different underlying ta…
- Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER)
A New Trajectory in UAV Safety: Leveraging Reinforcement Learning for Distance Maintenance Under Wind Variations
In the field of aviation, safety is a critical cornerstone, and the operation of Unmanned Aerial Vehicle (UAV) systems is deeply connected with this principle.
- Embry-Riddle Scholarly Commons 2024 · Journal article (IJAAA)
Just Culture in Aviation: A Metaphorical Study on Aircraft Maintenance Students
Just Culture, a sub-dimension of safety culture, has been a prominent and debated topic in aviation safety in recent years.
- Embry-Riddle Scholarly Commons 2024 · Journal article (IJAAA)
Performance PRISM: A Comprehensive Framework For Performance Measurement In Aircraft Maintenance
Aircraft maintenance is governed by rigorous safety requirements and high operational complexity, demanding robust performance measurement frameworks to ensure optimal maintenance practices.
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