Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Girdwood, Alaska 99587
Saturday, May 6, 1989 12:38 AKD
NTSB Narrative Summary Released at Completion of Accident
WHILE IFR AT 10,000 FEET OVER MOUNTAINOUS TERRAIN, THE HELCIOPTER EXPERIENCED VIOLENT VERTICAL VIBRATIONS, WHICH CONTINUED UNTIL THE CRASH-LANDING ABOUT FIVE MINUTES LATER. ON BOARD WEATHER RADAR WAS USED TO GUIDE THE HELICOPTER AROUND THE MOUNTAIN TOPS, WHICH WERE IN THE CLOUDS. AT ABOUT 200 FEET ABOVE THE GROUND, THE HELICOPTER CAUGHT FIRE, TAIL ROTOR CONTROL WAS LOST, BOTH ENGINES QUIT, AND CYCLIC CONTROL BECAME UNRESPONSIVE. THE HELICOPTER WAS DESTROYED BY POST-CRASH FIRE. ABOUT ONE HOUR OF FLT TIME EARLIER, THE HELICOPTER HAD UNDERGONE AN INSPECTION, DURING WHICH THE MAIN ROTOR FLIGHT CONTROL SYSTEM BOLTS HAD BEEN RETORQUED. ALL BUT ONE OF THESE BOLTS WERE FOUND IN THE WRECKAGE. HOWEVER, THE ROD END FOR THE MISSING BOLT WAS FOUND.
NTSB Probable Cause Narrative
A MAIN ROTOR FLIGHT CONTROL BOLT (PART NUMBER 20-057-6-38D) CAME OUT OF ITS ROD END BEARING WHILE IN FLIGHT DUE TO THE BOLT BEING IMPROPERLY TORQUED DURING MAINTENANCE.
Event Information
| Type of Event | Accident |
| Event Date | 5/6/1989 |
| Event Day of the Week | Saturday |
| Time of Event | 1238 |
| Event Time Zone | -- |
| Event City | GIRDWOOD |
| Event State | ALASKA |
| Event Country | -- |
| Zipcode of the event site | 99587 |
| Event Date Year | 1989 |
| Event Date Month | 5 |
| 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 | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | Not pertinent |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1151 Atlantic Daylight Time |
| Direction of event from weather observation facility (degrees) | 84 |
| Weather Observation Facility ID | ANC |
| Elevation of weather observation facility | 144 |
| Distance of event from weather observation facility (units?) | 37 |
| Time Zone of the weather observation | ADT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 5500 |
| Lowest Non-Ceiling Height | 2500 |
| Sky/Lowest/Cloud Conditions | Scattered |
| Sky Condition for Lowest Ceiling | Broken |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 60 |
| Air Temperature at event time (in degrees celsius) | 8 |
| Dew Point at event time (in degress fahrenheit) | 0 |
| Wind Direction (degrees magnetic) | 40 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 4 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 29 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | Minor |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | 2 |
| Injury Total None | -- |
| Injury Total Serious | -- |
| Injury Total All | 2 |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 680 |
| NTSB Notification Source | -- |
| NTSB Notification Date | May 6 1989 12:00AM |
| NTSB Notification Time | 1256 |
| Fiche Number and/or location -used to find docket information | 40054 |
| Date of most recent change to record | Dec 13 2000 12:39PM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N524EH |
| NTSB Number | ANC89FA069 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 135: Air Taxi & Commuter |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | -- |
| Damage | Destroyed |
| Aircraft Fire | In-flight |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | BELL |
| Aircraft Model | 412 |
| Aircraft Series Identifier | 412 |
| Aircraft Serial Number | 33069 |
| Certified Max Gross Weight | 11900 |
| 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 | 13 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | May 4 1989 12:00AM |
| Airframe hours since last inspection | 1 |
| Airframe Hours | 3578 |
| ELT Installed | Yes |
| ELT Activated | Yes |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | ERA AVIATION, INC. |
| Aircraft Owner Street Address | 6160 SOUTH AIRPARK DRIVE |
| Aircraft Owner City | ANCHORAGE |
| Aircraft Owner State | AK |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 99502 |
| Operator is an individual? | -- |
| Operator Name | |
| Operator Same as Owner? | No |
| 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 | ERAA |
| Owner has at least one certificate | Yes - certificate holder |
| Other Operator of large aircraft? | Yes |
| Certified for Part 133 or 137 Operation | External Load |
| 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 | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | VDZ |
| Departure City | VALDEZ |
| Departure State | AK |
| Departure Country | |
| Departure Time | 1143 |
| Departure Time Zone | ADT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | ANC |
| Destination City | ANCHORAGE |
| Destination State | AK |
| Destination Country | |
| Specific Phase of Flight | Cruise |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:30AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 0 |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |