Accident Hughes 269C N1091Y,
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ASN Wikibase Occurrence # 354899
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Date:Friday 2 January 1998
Time:10:30 LT
Type:Silhouette image of generic H269 model; specific model in this crash may look slightly different    
Hughes 269C
Owner/operator:Smith Helicopters, Inc.
Registration: N1091Y
MSN: 411050
Year of manufacture:1981
Total airframe hrs:6631 hours
Engine model:Lycoming HIO-360-D1A
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Riviera, TX -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:
Destination airport:
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Following a total loss of engine power, during a cattle herding flight, the pilot executed an autorotation to an area confined by trees. Engine examination revealed a broken crankshaft & camshaft. The camshaft exhibited deformation consistent with overload. All four cylinder mounting flanges were fretted & all piston rings showed 'excessive' wear. The #1 & #4 cylinder top compression rings were broken. Main bearing saddle faces of the crankcase showed heavy fretting. The engine manufacturer Materials Laboratory reported the mode of fracture of the crankshaft was fatigue. The fatigue originated from the oil hole (between #3 main & #3 crankpin journals) in the cheek and near the rear fillet radius of the #3 main bearing journal. The cause of the fatigue was not determined. During the overhaul, the crankshaft received a magnaflux inspection & re-nitriding by an inspection facility. The engine was reassembled & returned to service by company maintenance personnel. The engine had 1150.6 hours since overhaul.

Probable Cause: The total loss of engine power due to a fatigue failure of the crankshaft for undetermined reason. A factor was the lack of suitable terrain for the forced landing.

Accident investigation:
Investigating agency: NTSB
Report number: FTW98LA084
Status: Investigation completed
Duration: 3 years 1 month
Download report: Final report




Revision history:

11-Mar-2024 19:32 ASN Update Bot Added

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