ANC17LA042
2017-08-04 · Palmer, Alaska, United States · None · 1 aircraft · Status: Completed
N6523T has since been reassigned. It is now registered to a different aircraft (CESSNA 180H, built 1967), which was not involved in this event.
Aircraft involved
Probable cause & findings
The pilot's selection of unsuitable terrain for landing, which resulted in the right main landing (MLG) tire impacting a rock and the subsequent loss of directional control and collapse of the right MLG.
Factual narrative
On August 4, 2017, about 1900 Alaska daylight time, a tricycle gear equipped Beech BE19 airplane, N6523T, sustained substantial damage while landing at a remote unimproved airstrip, about 25 miles southeast of Palmer, Alaska. The airplane was being operated by the pilot as a 14 Code of Federal Regulations Part 91 visual flight rules flight. The private pilot and passenger were not injured. Visual meteorological conditions prevailed, and no flight plan had been filed. The flight departed Merrill Field Airport (PAMR), Anchorage, Alaska at about 1745. According to the pilot, while landing at a remote unimproved airstrip, the right main tire impacted a rock. The airplane began to veer to the right, and the right main gear collapsed, which resulted in substantial damage to the empennage and horizontal stabilizer. A National Transportation Safety Board (NTSB) Senior Metallurgist reported that visual and magnified optical examination of the fractured surfaces revealed features consistent with a bending overstress separation. No indications of preexisting fatigue, corrosion or significant porosity were detected. (A synopsis of the NTSB Metallurgist's case review is included in the public docket for this accident.) In the recommendation section of the NTSB Accident/Incident Reporting Form 6120.1, the pilot stated that the accident may have been avoided if the Federal Aviation Administration or Alaska Department of Transportation would have provided minimal funding to local pilot groups to provide minimal maintenance of routinely used backcountry airstrips. According to the private pilot, while landing at a remote, unimproved airstrip, the right main landing (MLG) tire impacted a rock. The airplane then began to veer right, and the MLG collapsed, which resulted in substantial damage to the empennage and horizontal stabilizer. Postaccident examination of the airplane revealed that the right MLG separated near its attachment point. Visual and magnified optical examinations of the fractured surfaces revealed features consistent with a bending overstress fracture. Due to the pilot's selection of unsuitable terrain to land, the right main tire impacted a rock, which resulted in the subsequent loss of directional control and collapse of the right MLG. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12
NTSB Findings
FAA avdata. C = Cause, F = Factor.
- C Personnel issues-Action/decision-Info processing/decision-Decision making/judgment-Pilot - C
- C Environmental issues-Physical environment-Runway/land/takeoff/taxi surface-(general)-Decision related to condition - C
- C Environmental issues-Physical environment-Object/animal/substance-Debris/dirt/foreign object-Effect on operation - C
Verbatim from NTSB's published report. Source file
NTSB_2017_ANC17LA042.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…