NTSB CAROL · Event
Event LAX93LA062
Aircraft involved
Probable cause & findings
THE INADEQUATE 100-HOUR INSPECTION PERFORMED BY COMPANY MAINTENANCE PERSONNEL. FACTORS CONTRIBUTING TO THIS ACCIDENT ARE THE FUEL CONTROL EXCEEDING THE MANUFACTURERS' SERVICE LIMITS; THE INOPERATIVE FUEL FILTER; THE OVERTEMPERATURE OF THE GAS GENERATOR TURBINE AND FREE TURBINE WHEELS; AND THE FALSE INDICATIONS OF THE TURBINE OUTLET TEMPERATURE INDICATOR.
Factual narrative
WHILE ON A SIGHTSEEING FLIGHT, THE HELICOPTER SUSTAINED A TOTAL LOSS OF POWER. THE PILOT EXECUTED AN AUTOROTATION TO A NEARBY ROAD. ON TOUCH DOWN THE HELICOPTER YAWED TO THE LEFT AND SKIDDED OFF THE ROAD BUCKLING THE LEFT SKID. THE ENGINE EXAMINATION DISCLOSED THAT THE TURBINE WHEELS SUSTAINED EXTENSIVE HIGH TEMPERATURE DISTRESS. THE FUEL CONTROL EXCEEDED ITS SERVICE LIMITS ON THE START AND ACCELERATION SCHEDULES. THE FUEL FILTER VALVE WAS FOUND IN THE BYPASS POSITION WITH ITS SPRING RUSTED AND THE VALVE SEAT CONTAINED DIRT PARTICLES. THE TURBINE OUTLET TEMPERATURE INDICATOR GAVE FALSE INDICATIONS, A LOWER THAN APPLIED TEMPERATURE, THROUGHOUT ITS OPERATIONAL PARAMETERS WHICH EXCEEDED THE SERVICABLE TOLERANCES. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1992_LAX93LA062.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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