Accident Hughes 369D N5013P,
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ASN Wikibase Occurrence # 30796
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Date:Monday 4 January 1999
Time:17:45 LT
Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different    
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
Location:7 miles south of Woodruff, UT -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Evanston, WY (KEVW)
Destination airport:
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:
Investigating agency: NTSB
Report number: DEN99TA031
Status: Investigation completed
Duration: 2 years and 3 months
Download report: Final report




Revision history:

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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