Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Golden, Colorado 80021
Sunday, May 8, 2011 14:30 MDT
NTSB Narrative Summary Released at Completion of Accident
The helicopter was following participants in a downhill skateboard race in mountainous terrain. The pilot had just performed a left-pedal turn and the helicopter was facing upslope to the mountain. The low rotor warning sounded and the pilot lowered the collective and increased throttle. The pilot stated that the engine did not respond so he continued to lower the collective and looked for a place to land. During the forced landing on the downsloping terrain the helicopter came to rest on its nose, resulting in substantial damage to the main rotor, skid tubes, and tail boom. Postaccident examination of the helicopter, engine, and systems, revealed no anomalies. The density altitude was calculated to be 10,600 feet. The pilot calculated the in-ground-effect hover to be 8,500 feet pressure altitude, the out-of-ground-effect hover to be 5,000 feet pressure altitude, and estimated the gross weight to be 2,320 pounds.
NTSB Probable Cause Narrative
The pilot’s decision to operate the helicopter at a high density altitude near terrain, which resulted in a settling with power condition.
Event Information
| Type of Event | Accident |
| Event Date | 5/8/2011 |
| Event Day of the Week | Sunday |
| Time of Event | 1430 |
| Event Time Zone | Mountain Daylight Time |
| Event City | Golden |
| Event State | COLORADO |
| Event Country | -- |
| Zipcode of the event site | 80021 |
| Event Date Year | 2011 |
| Event Date Month | 5 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 394402N |
| Event Location Longitude | 1051442W |
| Event Location Airport | -- |
| Event Location Nearest Airport ID | -- |
| Indicates whether the acc/inc occurred off or on an airport | Off Airport/Airstrip |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1450 Mountain Daylight Time |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | KBLC |
| Elevation of weather observation facility | 5673 |
| Distance of event from weather observation facility (units?) | -- |
| Time Zone of the weather observation | MDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | -- |
| Lowest Non-Ceiling Height | 10000 |
| Sky/Lowest/Cloud Conditions | Few |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 60 |
| Air Temperature at event time (in degrees celsius) | 27 |
| Dew Point at event time (in degress fahrenheit) | -18 |
| Wind Direction (degrees magnetic) | 200 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 8 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 29.61 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | METAR KBJC 081349Z 00000KT 40SM SKC 16/M07 A2974 |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 3 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 28530 |
| NTSB Notification Source | FAA ANM ROC |
| NTSB Notification Date | -- |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | -- |
| Date of most recent change to record | May 27 2011 5:00PM |
| User who most recently changed record | bowl |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N921JM |
| NTSB Number | CEN11CA325 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | No |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | ROBINSON HELICOPTER COMPANY |
| Aircraft Model | R44 II |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 10565 |
| Certified Max Gross Weight | 2500 |
| Aircraft Category | Helicopter |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 4 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | 100 Hour |
| Date of Last Inspection | Mar 11 2011 12:00AM |
| Airframe hours since last inspection | -- |
| Airframe Hours | 1185.5 |
| ELT Installed | No |
| ELT Activated | Unknown |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | THUNDERBIRD AVIATION LLC |
| Aircraft Owner Street Address | 40 MOUNTAIN PINE DR |
| Aircraft Owner City | LITTLETON |
| Aircraft Owner State | CO |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 80127-4365 |
| Operator is an individual? | No |
| Operator Name | Colorado Helicopter Inc |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 11844 Corporate Way |
| Operator City | Broomfield |
| Operator State | CO |
| Operator Country | USA |
| Operator Zip code | 80021 |
| Operator Code | -- |
| Owner has at least one certificate | None |
| 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) | Aerial Observation |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | KBJC |
| Departure City | Denver |
| Departure State | CO |
| Departure Country | USA |
| Departure Time | 1420 |
| Departure Time Zone | -- |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | KBJC |
| Destination City | Denver |
| Destination State | CO |
| Destination Country | USA |
| Specific Phase of Flight | -- |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | May 19 2011 6:48PM |
| User who most recently changed record | kaij |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | N/A |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |