ASN Wikibase Occurrence # 40772
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| Date: | Saturday 30 July 1994 |
| Time: | 19:50 LT |
| Type: |  Hughes OH-6A |
| Owner/operator: | Utah Dept Of Public Safety |
| Registration: | N12UT |
| MSN: | 65-12953 |
| Year of manufacture: | 1966 |
| Total airframe hrs: | 2549 hours |
| Engine model: | ALLISON T63-A-700 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Duchesne, UT -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Salt Lake City, UT (KSLC) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE RETURNING TO SALT LAKE CITY FROM THE SOUTHEAST, THE PILOT REPORTED SEEING THUNDERSTORMS IN THE AREA. AT ABOUT 1843 MDT, THE HELICOPTER CHANGED COURSE AND PROCEEDED OVER MOUNTAINOUS TERRAIN WITH A MODE C ALTITUDE READOUT OF 9600 TO 9800 FEET MSL. THE TERRAIN ELEVATION ALONG THE FLIGHT PATH CHANGED FROM 7700 TO ABOUT 10,000 FEET. SHORTLY AFTER PASSING OVER TERRAIN NEAR 10,000 FEET, THE PILOT RADIOED A MAYDAY AND DECLARED THAT THE ENGINE WAS LOSING POWER. THE HELICOPTER BEGAN A DESCENT, ROUGHLY FOLLOWING A CANYON DRAINAGE AREA. SUBSEQUENTLY, IT CRASHED AT AN ELEVATION OF APPROXIMATELY 8850 FEET AFTER IMPACTING TREES. THE LONGITUDINAL WRECKAGE DISTRIBUTION WAS MINIMAL, INDICATING SLOW FORWARD VELOCITY AT TREE IMPACT. AN EXAM OF THE ENGINE REVEALED EVIDENCE OF POWER PRODUCTION DURING IMPACT; NO PREIMPACT PART FAILURE/MALFUNCTION WAS FOUND. THE DENSITY ALTITUDE WAS ESTIMATED TO BE ABOUT 12,000 FEET, AND THE HELICOPTER'S GROSS WEIGHT AT THE TIME OF THE ACCIDENT WAS ESTIMATED TO BE 1977 POUNDS. PERFORMANCE EVALUATION SHOWED THAT WITH THESE CONDITIONS, THE HELICOPTER WOULD HAVE BEEN UNABLE TO MAINTAIN A HOVER OUT OF GROUND EFFECT. THE ROTOR BLADES SHOWED ROTATIONAL ENERGY IMPACT SIGNATURES.
Probable Cause: THE PILOT'S IMPROPER IN-FLIGHT PLANNING/DECISION AND FAILURE TO MAINTAIN SUFFICIENT ALTITUDE/CLEARANCE FROM THE SURROUNDING TERRAIN. FACTORS RELATED TO THE ACCIDENT WERE: THUNDERSTORMS IN THE AREA (REQUIRING THE PILOT TO DEVIATE FROM THE DESIRED COURSE), HIGH MOUNTAINOUS TERRAIN, AND HIGH DENSITY ALTITUDE,
Accident investigation:
 |
|
Sources:
NTSB SEA94GA203
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 05:38 | ASN Update Bot | Updated [Time, Cn, Other fatalities, Phase, Departure airport, Source, Narrative, Category, Accident report] |
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