Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Spanish Fork, Utah 84660
Saturday, December 8, 1984 9:15 MST
NTSB Narrative Summary Released at Completion of Accident
SHORTLY AFTER TAKEOFF PLT FELT SHUTTER IN ACFT AND NOTICED A RISE IN THE TURBINE OUTLET TEMP. PLT HEARD LOW WHINE OF HIGH PITCH NOISE IN ENGINE. ENGINE CHIP DETECTOR LIGHT CAME ON FOLLOWED BY THE ENGINE OUT LIGHT AND HORN AND OIL PRESSURE WARNING LIGHT. AUTOROTATION MADE TO OPENING AT BOTTOM OF CANYON. ON TOUCHDOWN ACFT SLID FORWARD IN 1 FT DEEP SNOW, RT SKID COLLAPSED AND HELICOPTER ROLLED OVER ON ITS RIGHT SIDE. INSPECTION REVEALED EVIDENCE OF OIL STARVATION IN TURBINE AND COMPRESSOR SECTIONS. TURBINE BEARINGS FAILED, GEARBOX BEARINGS BORE EVIDENCE OF HIGH HEAT DISTORTION AND OIL STARVATION WAS EVIDENT IN COMPRESSOR BEARINGS. LUBRICATION SYSTEM COMPONENTS WERE CHECKED AND OPERATED NORMALLY. A 1 1/8 IN DISK OF GASKET LIKE MATERIAL WAS FOUND IN OIL RESERVOIR. DISK WAS SIMILIAR TO THOSE IN CAPS ON QUARTS OF OIL. DISK WAS SAME SIZE AS OPENING TO OIL PUMP AND ENGINE. WHEN PLACED OVER OPENING OIL FLOW FROM TANK TO ENGINE WAS BLOCKED. EXTRA QTS OF OIL OFTEN WERE ON BOARD ACFT SO PLT COULD ASS OIL IF REQUIRED.
NTSB Probable Cause Narrative
Not Yet Reported
Event Information
| Type of Event | Accident |
| Event Date | 12/8/1984 |
| Event Day of the Week | Saturday |
| Time of Event | 915 |
| Event Time Zone | Mountain Standard Time |
| Event City | SPANISH FORK |
| Event State | UTAH |
| Event Country | -- |
| Zipcode of the event site | 84660 |
| Event Date Year | 1984 |
| Event Date Month | 12 |
| 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 | 16 |
| Degrees magnetic from airport | 110 |
| Airport Elevation | -- |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 845 Mountain Standard Time |
| Direction of event from weather observation facility (degrees) | 298 |
| Weather Observation Facility ID | PVU |
| Elevation of weather observation facility | 4491 |
| Distance of event from weather observation facility (units?) | 22 |
| Time Zone of the weather observation | MST |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 6000 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Unknown |
| Sky Condition for Lowest Ceiling | Overcast |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 1 |
| Air Temperature at event time (in degrees celsius) | 0 |
| Dew Point at event time (in degress fahrenheit) | -1 |
| Wind Direction (degrees magnetic) | 0 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 0 |
| Wind Velocity Indicator | Calm |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 30 |
| Density Altitude (feet) | 6717 |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 2 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 2483 |
| NTSB Notification Source | -- |
| NTSB Notification Date | -- |
| NTSB Notification Time | 0 |
| Fiche Number and/or location -used to find docket information | 26424 |
| Date of most recent change to record | Jan 2 2001 9:15AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Instrument Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N5124X |
| NTSB Number | DEN85LA038 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 135: Air Taxi & Commuter |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | -- |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | HUGHES |
| Aircraft Model | 369D |
| Aircraft Series Identifier | 369D |
| Aircraft Serial Number | 911099D |
| Certified Max Gross Weight | 3000 |
| 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 | 4 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | 100 Hour |
| Date of Last Inspection | Oct 30 1984 12:00AM |
| Airframe hours since last inspection | 79 |
| Airframe Hours | 983 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | ROCKY MOUNTAIN HELICOPTERS, |
| Aircraft Owner Street Address | P.O. BOX 1337 |
| 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 | 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 | No |
| Departure Point Same as Event | No |
| Departure Airport Code | PUC |
| Departure City | PRICE |
| Departure State | UT |
| Departure Country | |
| Departure Time | 715 |
| 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 | Landing |
| 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 | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |