ASN Wikibase Occurrence # 378002
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| Date: | Saturday 8 December 1984 |
| Time: | 10:15 LT |
| Type: |  Hughes 369D |
| Owner/operator: | Rocky Mountain Helicopters, |
| Registration: | N5124X |
| MSN: | 911099D |
| Total airframe hrs: | 983 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Spanish Fork, UT -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Price, UT (KPUC) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB DEN85LA038
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Mar-2024 18:50 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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