Aircraft Incident/Accident Report


Clarkson Valley, Missouri 63017
Friday, October 15, 2010 11:10 CDT

| More
NTSB Narrative Summary Released at Completion of Accident
During the flight that preceded the accident flight, the pilot stated to one of the two officers aboard the helicopter that he would not be able to fly for as long as normal because he needed to obtain fuel. Upon completion of the observation flight, the pilot returned to the police department and shut down the helicopter to allow the two officers to exit. The pilot then restarted the helicopter and departed en route to an airport where he could refuel the helicopter. A witness near the accident site stated that he heard the helicopter’s engine sputter and stop and saw the main rotor separate from the helicopter. The helicopter entered an uncontrolled descent and impacted terrain. Postaccident examination of the helicopter revealed that there was no usable fuel on board and that the main rotor mast separated as a result of overload due to mast bumping (main rotor hub to rotor mast contact). No preimpact mechanical anomalies that would have precluded normal operation of the helicopter were noted. Mast bumping typically results from a low-G flight condition caused by the pilot pushing the cyclic control forward abruptly from either straight-and-level flight or after a climb. Pushing the cyclic forward abruptly is contrary to the appropriate actions for entering an autorotation, which are lowering the collective pitch control to the full down position, adding antitorque pedal as needed to maintain heading, and applying cyclic as needed to maintain proper airspeed. Review of the pilot’s medical records indicated that he had a history of depression, anxiety, and obstructive sleep apnea. Each of these conditions had been documented and treated since 2007, and none were reported to the Federal Aviation Administration (FAA) on the pilot’s airman medical application in 2010 or earlier. Any of these conditions may have disqualified the pilot from obtaining an airman’s medical certificate. Postmortem toxicological testing indicated that the pilot was taking alprazolam, an anti-anxiety medication, and venlafaxine, an anti-depressant. Alprazolam is one of a class of drugs which may worsen obstructive sleep apnea, and venlafaxine can cause fatigue and dizziness. The fact that the blood level of venlafaxine found was higher than normal therapeutic levels makes it more likely that the side effect of dizziness occurred and impaired the pilot’s performance.
NTSB Probable Cause Narrative
The total loss of engine power due to fuel exhaustion, which resulted from the pilot's inadequate preflight planning and decision-making, and his improper control inputs following the loss of engine power, which resulted in mast bumping and separation of the main rotor. Contributing to the accident was the pilot's improper judgment in acting as a pilot with disqualifying medical conditions.
Event Information
Type of EventAccident 
Event Date10/15/2010 
Event Day of the WeekFriday 
Time of Event1110 
Event Time ZoneCentral Daylight Time 
Event CityClarkson Valley 
Event StateMISSOURI 
Event Country-- 
Zipcode of the event site63017 
Event Date Year2010 
Event Date Month10 
MidAir Collision IndicatorNo 
On Ground Collision occurred ?No 
Event Location Latitude383759N 
Event Location Longitude0903552W 
Event Location Airport-- 
Event Location Nearest Airport ID-- 
Indicates whether the acc/inc occurred off or on an airportOff Airport/Airstrip 
Distance from airport in statute miles-- 
Degrees magnetic from airport-- 
Airport Elevation-- 
Weather Briefing Completeness-- 
Investigator's weather sourceWeather Observation Facility 
Time of the weather observation1054 Central Daylight Time 
Direction of event from weather observation facility (degrees)315 
Weather Observation Facility IDSUS 
Elevation of weather observation facility463 
Distance of event from weather observation facility (units?)
Time Zone of the weather observationCDT 
Lighting ConditionsDay 
Lowest Ceiling Height-- 
Lowest Non-Ceiling Height-- 
Sky/Lowest/Cloud ConditionsClear 
Sky Condition for Lowest CeilingNone 
Visibility Runway Visual Range (Feet)-- 
Visibility Runway Visual Value (Statute Miles)-- 
Visibility (Statute Miles) 10 
Air Temperature at event time (in degrees celsius)17 
Dew Point at event time (in degress fahrenheit)
Wind Direction (degrees magnetic)350 
Variable Wind IndicatorWind direction could be determined 
Wind Speed (knots)
Wind Velocity Indicator -- 
Wind Gust IndicatorNot Gusting 
Wind Gust (knots) -- 
Altimeter Setting at event time (in. Hg) 30.13 
Density Altitude (feet)-- 
Intensity of Precipitation-- 
METAR weather report -- 
Event Highest InjuryFatal 
On Ground, Fatal Injuries-- 
On Ground, Minor Injuries-- 
On Ground, Serious Injuries-- 
Injury Total Fatal
Injury Total Minor-- 
Injury Total None-- 
Injury Total Serious-- 
Injury Total All
Investigating AgencyNTSB 
NTSB Docket Number (internal use)29548 
NTSB Notification SourceFAA  
NTSB Notification Date-- 
NTSB Notification Time-- 
Fiche Number and/or location -used to find docket information-- 
Date of most recent change to recordFeb 24 2012 12:41AM 
User who most recently changed recordsnyg 
Basic weather conditionsVisual Meteorological Cond 
FAA District Office-- 
Aircraft Involved
Aircraft #1
Aircraft Registration NumberN96MP 
NTSB NumberCEN11GA020 
Missing Aircraft Indicator-- 
Federal Aviation Reg. PartPart 91: General Aviation 
Type of Flight Plan filedNone 
Flight plan Was Activated?No 
DamageSubstantial 
Aircraft FireNone 
Aircraft ExplosionNone 
Aircraft Manufacturer's Full NameBELL 
Aircraft Model206B 
Aircraft Series Identifier-- 
Aircraft Serial Number3377 
Certified Max Gross Weight3200 
Aircraft CategoryHelicopter 
Aircraft Registration Class-- 
Aircraft is a homebuilt?No 
Flight Crew Seats-- 
Cabin Crew Seats-- 
Passenger Seats-- 
Total number of seats on the aircraft
Number of Engines
Fixed gear or retractable gearFixed 
Aircraft, Type of Last Inspection100 Hour 
Date of Last InspectionMay 7 2010 12:00AM 
Airframe hours since last inspection69 
Airframe Hours11254 
ELT InstalledNo 
ELT ActivatedUnknown 
ELT Aided Location of Event SiteUnknown 
ELT Type-- 
Aircraft Owner NameMISSOURI STATE HIGHWAY PATROL 
Aircraft Owner Street Address1510 EAST ELM PO BOX 568 
Aircraft Owner CityJEFFERSON CITY 
Aircraft Owner StateMO 
Aircraft Owner CountryUSA  
Aircraft Owner Zipcode65102 
Operator is an individual?No 
Operator NameMISSOURI STATE HIGHWAY PATROL 
Operator Same as Owner?Yes 
Operator Is Doing Business As-- 
Operator Address Same as Owner?Yes 
Operator Street Address1510 EAST ELM PO BOX 568 
Operator CityJEFFERSON CITY 
Operator StateMO 
Operator CountryUSA  
Operator Zip code65102 
Operator Code-- 
Owner has at least one certificateNone 
Other Operator of large aircraft?No 
Certified for Part 133 or 137 Operation-- 
Operator Certificate Number-- 
Indicates whether an air carrier operation was scheduled or not-- 
Indicates Domestic or International Flight-- 
Operator carrying Pax/Cargo/Mail-- 
Type of Flying (Per_Bus / Primary)-- 
Second Pilot on BoardNo 
Departure Point Same as EventNo 
Departure Airport Code-- 
Departure CityArnold 
Departure StateMO 
Departure CountryUSA 
Departure Time1053 
Departure Time ZoneCDT 
Destination Same as Local Flt-- 
Destination Airport CodeSUS  
Destination CitySt. Louis 
Destination StateMO 
Destination CountryUSA 
Specific Phase of Flight-- 
Report sent to ICAO?-- 
Evacuation occurred-- 
Date of most recent change to recordDec 30 2011 1:24PM 
User who most recently changed recordgalm 
Since inspection or accidentTime of Accident 
Event Location Runway Number and LocationN/A 
Runway Length-- 
Runway Width-- 
Sight Seeing flightNo 
Air Medical FlightNo 
Medical Flight--