ERA21LA235
2021-05-26 · Marathon, Florida, United States · None · 1 aircraft · Status: Completed
Airport MTH
Aircraft involved
Probable cause & findings
The failure of the right main landing gear to fully extend during landing as a result of the underinflated right main landing gear oleo strut.
Factual narrative
According to the pilot, during final approach the nose and left main landing gear lights were illuminated green. The red “in-transit” light was illuminated for the right main landing gear. He overflew the runway and airport personnel confirmed that the right main landing gear was partially extended. He unsuccessfully attempted to cycle, manually extend, and use g-force maneuvers to extend the right main landing gear. The pilot performed a landing and kept the right wing off the ground as long as he could during the landing since the right main landing gear was partially extended. During the landing rollout, the right wing impacted the runway, the airplane veered to the right and came to rest off the right side of the runway, resulting in substantial damage to the right aileron. A post-accident examination of the right main landing gear revealed that the oleo strut was under inflated, therefore, the strut did not extend the wheel properly and could not retract correctly into the right main landing gear wheel well. Then, when the landing gear was extended, the wheel became lodged on the wheel well and could not extend properly. After the airplane was lifted off the runway, the right main landing gear was extended by hand and it locked into place. The most recent annual inspection was performed about 5 months before the accident, and at that time the left main landing gear actuator was serviced. The maintenance entry did not record any service to the right main landing gear. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12
NTSB Findings
FAA avdata. C = Cause, F = Factor.
- — Personnel issues-Task performance-Maintenance-Scheduled/routine maintenance-Maintenance personnel
- — Aircraft-Aircraft systems-Landing gear system-Main gear strut/axle/truck-Not serviced/maintained
Verbatim from NTSB's published report. Source file
NTSB_2021_ERA21LA235.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
Matched on aircraft type or causal vocabulary (maintenance). All research papers
- 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 2026 · Article (Reliability Engineering & System Safety) Understanding human error in military aviation maintenance: The role of Performance shaping factors, cognitive workload and error orientation
- 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.
- Semantic Scholar 2024 · Article (Defence Science Journal) Modelling of Human Factors in Aviation Maintenance Using HFACS ME Human Factors Analysis and Classification System Maintenance Extension and Bayesian Network
Aircraft maintenance is a complex task involving a skilled human workforce, spare parts, and various other resources. Human factors are an inherent element of the human workforce.
- 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 (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…