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ASN Wikibase Occurrence # 30796
Last updated: 26 April 2019
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Date:04-JAN-1999
Time:16:45
Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
Hughes 369D
Owner/operator:Hawkins
Registration: N5013P
C/n / msn: 610984D
Fatalities:Fatalities: 0 / Occupants: 3
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:7 miles south of Woodruff, UT -   United States of America
Phase: Unknown
Nature:Unknown
Departure airport:Evanston, WY (EVW)
Destination airport:
Investigating agency: NTSB
Narrative:
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.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001204X00050&key=1


Revision history:

Date/timeContributorUpdates
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]

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