ASN Wikibase Occurrence # 30796
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| Date: | Monday 4 January 1999 |
| Time: | 17:45 LT |
| Type: |  Hughes 369D |
| Owner/operator: | Hawkins & Powers Aviation, Inc |
| Registration: | N5013P |
| MSN: | 610984D |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 6484 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 7 miles south of Woodruff, UT -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | Evanston, WY (KEVW) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
As the helicopter was being maneuvered at low altitude, the pilot heard a series of compressor stalls, accompanied by a rapid decay of rotor rpm. The helicopter struck the ground, spun around and rolled over on its right side. The engine was functionally tested and was 20 horsepower below overhaul specifications. The compressor stalled repeatedly. Compressor disassembly disclosed case liner erosion, most noticeably at the 5th and 6th stages, and the rotating labyrinth seal was missing. After replacing the seal and installing a slave compressor module, the engine tested normal.
Probable Cause: A partial loss of engine power due to erosion in the compressor assembly module. Factors were a missing rotating labyrinth seal, the installation of which had not been performed by unknown maintenance personnel.
Accident investigation:
 |
|
Sources:
NTSB DEN99TA031
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 24-Dec-2009 11:53 | harro | Updated [Time, Aircraft type, Total fatalities, Total occupants, Location, Country, Nature, Destination airport, Source, Damage, Narrative] |
| 25-Nov-2017 12:48 | ASN Update Bot | Updated [Time, Cn, Operator, Nature, Departure airport, Destination airport, Source, Narrative] |
| 14-Dec-2017 16:55 | ASN Update Bot | Updated [Cn, Operator, Departure airport, Destination airport, Narrative] |
| 08-Apr-2024 11:03 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Source, Narrative, Category, Accident report] |
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