NTSB CAROL · Event
Event DEN92IA067
Registry · N222UH
FAA Aircraft Registry record.
Make / Model
ROBINSON HELICOPTER R44 II
Year of manufacture
2008
TCDS
H11NM · ROBINSON HELICOPTER CO
Engine
LYCOMING IO-540-AE1A5 (260 hp)
Seats / Engines
4 seats · 1 engine
Last airworthiness date
20080317
ADS-B equipped
Yes — Mode-S A1EA39
Registrant of record
ALBA AVIATION SERVICES INC
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
AN ENCOUNTER WITH CLEAR AIR TURBULENCE.
Factual narrative
THE EMS HELICOPTER ENCOUNTERED CLEAR AIR TURBULENCE WHILE EN ROUTE TO PICK UP A PATIENT. DURING THE EVENT, THE NOSE PITCHED UP RAPIDLY TO ABOUT 20 DEGREES, ACTIVATING THE ELT. THE PILOT FELT FEEDBACK THROUGH THE CONTROLS AND LANDED TO RESET THE ELT. LATER, THE PILOT NOTED MAST TORQUE FLUCTUATIONS FOLLOWED BY A ZERO READING ON THE GAUGE. POSTFLIGHT INSPECTION DISCLOSED THE TRANSMISSION HAD CONTACTED ITS MOUNTS, SEVERING SEVERAL ELECTRICAL LEADS INCLUDING THE TORQUE SENSOR. A CRACK WAS ALSO DISCOVERED ABOUT 2 1/2 FEET OUTBOARD OF THE MAIN BLADE GRIP, PROPAGATING BACK FROM THE BLADE LEADING EDGE. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1992_DEN92IA067.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 (turbulence). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- arXiv 2026 · arXiv preprint
Direct Numerical Simulations of Ice-Ocean Boundary Turbulence
Turbulent heat and freshwater transport at ice-ocean interfaces controls glacier and iceberg melt rates, yet the underlying physics remains poorly constrained.
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER)
Political Turbulence and Aviation Safety: A Cross-National Analysis of Political Stability's Effects on Aviation Accidents
To what extent does political stability affect aviation safety? This research aims to link domestic political conditions and public safety through the consideration of aviation accident frequency.
- arXiv 2025 · arXiv preprint
Explainable LiDAR 3D Point Cloud Segmentation and Clustering for Detecting Airplane-Generated Wind Turbulence
Wake vortices - strong, coherent air turbulences created by aircraft - pose a significant risk to aviation safety and therefore require accurate and reliable detection methods.
- arXiv 2024 · arXiv preprint
Does small-scale turbulence matter for ice growth in mixed-phase clouds?
Representing the glaciation of mixed-phase clouds in terms of the Wegener-Bergeron-Findeisen process is a challenge for many weather and climate models, which tend to overestimate this process because…
- arXiv 2023 · arXiv preprint
Effects of electrostatic interaction on clustering and collision of bidispersed inertial particles in homogeneous and isotropic turbulence
In sandstorms and thunderclouds, turbulence-induced collisions between solid particles and ice crystals lead to inevitable triboelectrification.
- SKYbrary (Eurocontrol) 2023 · SKYbrary article
Wake Vortex Turbulence — SKYbrary Knowledge Base
SKYbrary wake vortex turbulence comprehensive article — generation mechanics, dissipation factors, separation standards (ICAO LIGHT/MEDIUM/HEAVY/SUPER + recategorisation RECAT-EU).
Browse the full corpus — academia portal ↗