Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Billings, Montana 59102
Friday, November 7, 1986 8:20 MST
NTSB Narrative Summary Released at Completion of Accident
WHILE ON TAKEOFF FROM A HOSPITAL ROOF TOP HELIPAD ON AN EMERGENCY MEDICAL SERVICE FLT, A SYNCHRONIZED ELEVATOR COVER BLEW OFF AND STRUCK THE TAIL ROTOR. THIS RESULTED IN AN INFLIGHT SEPARATION OF ONE TAIL ROTOR BLADE AND A LOSS OF ANTI-TORQUE CONTROL. THE PLT EXECUTED AN AUTOROTATION IN THE URBAN AREA WITH NO SUITABLE TERRAIN FOR AN EMERGENCY FORCED LANDING.
NTSB Probable Cause Narrative
Not Yet Reported
Event Information
| Type of Event | Accident |
| Event Date | 11/7/1986 |
| Event Day of the Week | Friday |
| Time of Event | 820 |
| Event Time Zone | Mountain Standard Time |
| Event City | BILLINGS |
| Event State | MONTANA |
| Event Country | -- |
| Zipcode of the event site | 59102 |
| Event Date Year | 1986 |
| Event Date Month | 11 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| 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 | 0 |
| Degrees magnetic from airport | 0 |
| Airport Elevation | 0 |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Pilot |
| Time of the weather observation | 828 Mountain Standard Time |
| Direction of event from weather observation facility (degrees) | 340 |
| Weather Observation Facility ID | BIL |
| Elevation of weather observation facility | 3649 |
| Distance of event from weather observation facility (units?) | 1 |
| Time Zone of the weather observation | MST |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 100 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Partial Obscuration |
| Sky Condition for Lowest Ceiling | Overcast |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 0 |
| Air Temperature at event time (in degrees celsius) | -2 |
| Dew Point at event time (in degress fahrenheit) | -2 |
| Wind Direction (degrees magnetic) | 40 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 7 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 29 |
| Density Altitude (feet) | 2900 |
| Intensity of Precipitation | Light |
| METAR weather report | -- |
| Event Highest Injury | Serious |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | 1 |
| Injury Total None | -- |
| Injury Total Serious | 2 |
| Injury Total All | 3 |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 2293 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Nov 7 1986 12:00AM |
| NTSB Notification Time | 915 |
| Fiche Number and/or location -used to find docket information | 32948 |
| Date of most recent change to record | Jan 2 2001 9:14AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Instrument Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N3889S |
| NTSB Number | DEN87FA018 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 135: Air Taxi & Commuter |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | -- |
| Damage | Destroyed |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | BELL |
| Aircraft Model | 206L-3 |
| Aircraft Series Identifier | 206L-3 |
| Aircraft Serial Number | 45576 |
| Certified Max Gross Weight | 4150 |
| Aircraft Category | Helicopter |
| Aircraft Registration Class | U.S. Registered/U.S. Soil |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 7 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | AAIP |
| Date of Last Inspection | Nov 4 1986 12:00AM |
| Airframe hours since last inspection | 1 |
| Airframe Hours | 2869 |
| ELT Installed | Yes |
| ELT Activated | Yes |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | ROCKY MOUNTAIN HELICOPTER INC. |
| Aircraft Owner Street Address | 800 SOUTH 3110 WEST |
| Aircraft Owner City | PROVO |
| Aircraft Owner State | UT |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 84601 |
| Operator is an individual? | -- |
| Operator Name | |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | |
| Operator City | |
| Operator State | |
| Operator Country | |
| Operator Zip code | |
| Operator Code | |
| Owner has at least one certificate | Yes - certificate holder |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | Unknown |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | Non-scheduled |
| Indicates Domestic or International Flight | Domestic |
| Operator carrying Pax/Cargo/Mail | Passenger Only |
| Type of Flying (Per_Bus / Primary) | Unknown |
| Second Pilot on Board | No |
| Departure Point Same as Event | No |
| Departure Airport Code | |
| Departure City | BILLINGS |
| Departure State | MT |
| Departure Country | |
| Departure Time | 817 |
| Departure Time Zone | MST |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | |
| Destination City | |
| Destination State | |
| Destination Country | |
| Specific Phase of Flight | Descent |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:36AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 0 |
| Runway Length | 0 |
| Runway Width | 0 |
| Sight Seeing flight | No |
| Air Medical Flight | Yes |
| Medical Flight | -- |