DEN99LA138
1999-08-07 · DURANGO, Colorado, United States · None · 1 aircraft · Status: Completed
Airport 5CO0
Current FAA registration · N4835F
- Make / Model
- CESSNA TU206A
- Engine
- CONT MOTOR GTSIO-520-C (340 hp)
- Seats / Engines
- 6 seats · 1 engine
- Last airworthiness date
- 19660308
- ADS-B equipped
- Yes — Mode-S A5F6CB
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
A worn landing nose gear steering system that diminished the ability to steer the airplane. Factors were improper maintenance by unknown persons, and loose gravel.
Factual narrative
On August 7, 1999, at 2359 mountain daylight time, a Cessna TU206A, N4835F, sustained substantial damage when it departed the left side of runway 01 during landing roll at Animas Air Park, Durango, Colorado. The commercial pilot and his four passengers were not injured. Visual meteorological conditions prevailed for this personal flight operating under Title 14 CFR Part 91 and no flight plan was filed. The flight originated from Window Rock, Arizona, at 2100. Weather at the time was clear skies with wind from 350 degrees at four knots. According to the pilot, the aircraft had traveled a short distance following a normal touchdown on runway centerline when the aircraft pulled hard to the left and exited the left side of the runway onto a gravel covered area. He said that as the aircraft decelerated through an estimated 10 miles per hour, the nose wheel broke off. Examination of the aircraft by a mechanic employed by Greg's Flying Service, in Durango, provided evidence that the left wing, propeller, and nose landing gear has sustained damage. The mechanic also found that one of the nose wheel steering arm roll pins was missing and a piece of safety wire was substituted, and the other roll pin and roll pin receptacles were worn beyond limits. (See attached diagram.) According to the flying service mechanic, this would cause the nose wheel steering to be sloppy and slow to respond to pilot input. When the nose wheel steering had work performed on it is unknown. While landing at the completion of a cross-country flight the airplane departed the side of the runway onto loose gravel during landing roll, and the nose wheel assembly separated. Examination of the airplane disclosed that the nose wheel steering assembly was worn, and improper parts had been substituted. As a result, steering control was diminished. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1999_DEN99LA138.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…