NTSB CAROL · Event
Event DEN99LA056
Aircraft involved
Probable cause & findings
A total loss of engine power for undetermined reasons.
Factual narrative
On March 13, 1999, approximately 1045 mountain standard time, an Aero Commander 200D, N49J, owned and operated by the pilot, was substantially damaged during a forced landing following a total loss of engine power while maneuvering at the Evanston Uinta County Airport, Evanston, Wyoming. The private pilot and one passenger were not injured. The aircraft was being operated under Title 14 CFR Part 91, and no flight plan was filed. Visual meteorological conditions prevailed for the local flight which originated approximately 15 minutes before the accident. According to the pilot, he was conducting a flight test after recent maintenance work had been completed on the engine's electrically-driven fuel pump. A thorough preflight was performed, including fuel levels and drainage, and no water was found in the fuel. Prior to takeoff, he performed an extended run-up at all throttle positions and a mock takeoff to a full stop, and no engine discrepancies were noted. After an uneventful departure, the nose landing gear light failed to indicate that it was in the up and locked position. The pilot climbed to 10,000 feet and attempted to recycle the landing gear, but was unsuccessful. He stated that the aircraft's airspeed indicated that the gear was in the up position. While in cruise flight, he flew the aircraft at various power settings and the engine "ran smoothly." He then descended to traffic pattern altitude so that he could fly over the airport to have an observer on the ground verify the landing gear's position. According to the pilot, "about that time the engine quit without warning... The engine sputtered a second, then stopped again, with the electric fuel pump [on]." The pilot stated that he did not have time to extend the landing gear, and was concerned that he would not make the runway due to drag. He performed an emergency gear-up landing on runway 23. Upon impact, the aircraft sustained damage to the underside of the fuselage, bending the lower 2 inches of the firewall. A postaccident examination of the engine was performed by an FAA maintenance inspector. Fuel was observed in the engine and the fuel tanks. The electric fuel pump was also tested and found to be operational, with fuel present in each of the fuel injector nozzles while the fuel pump was on. No additional engine discrepancies were noted (see attached inspector's statement). The pilot was conducting a test flight after recent maintenance work had been performed on the engine. A thorough preflight was performed, and no water was found in the fuel. The pilot completed an extended run-up at all throttle positions, including a mock takeoff to a full stop. After an uneventful departure, the nose landing gear light failed to indicate that it was in the up and locked position. The pilot climbed to 10,000 feet and attempted to recycle the landing gear, but was unsuccessful. He over flew the airport to have a ground observer verify the landing gear's position. According to the pilot, 'about that time the engine quit without warning... The engine sputtered a second, then stopped again, with the electric fuel pump [on].' He performed an emergency gear-up landing on the runway. A postaccident engine examination was performed by an FAA inspector, including an inspection of the electrically-driven fuel pump that had recently been replaced. Fuel was present in each of the fuel injector nozzles and no engine discrepancies were observed. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1999_DEN99LA056.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
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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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