ASN Wikibase Occurrence # 39007
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| Date: | Tuesday 30 May 1995 |
| Time: | 10:54 LT |
| Type: |  Weatherly 201C |
| Owner/operator: | Platte Valley Aero Spraying |
| Registration: | N9038W |
| MSN: | 1019 |
| Total airframe hrs: | 2810 hours |
| Engine model: | P&W R-985-AN14B |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Clarks, NE -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A WITNESS WHO OCCASIONALLY SAW THE AIRPLANE DURING ITS TURN TO REVERSE DIRECTION REPORTED THAT HE HEARD A LOUD 'POP' SHORTLY AFTER THE ENGINE SUDDENLY STOPPED RUNNING. THE ENGINE EXAMINATION REVEALED A FREE WHEELING SUPERCHARGER IMPELLER. THE COLLECTOR DRIVE FLOATER GEAR HAD 4 1/2 TEETH MISSING. METAL CHIPS WERE DETECTED IN THE OIL SCREEN. THE GEAR TEETH FROM THE FLOATER GEAR WERE FOUND IN THE SUMP AND ENGINE'S CRANKCASE HOUSING. A BORESCOPE INSPECTION OF THE ENGINE'S CYLINDERS REVEALED OPERATION WITH A RICH MIXTURE. SUDDEN STOPPAGE OF THE IMPELLER WOULD NOT RESULT IN THE GEAR TEETH'S LOCATION NOTED ABOVE. MISSING GEAR TEETH COULD ALSO INTERRUPT ENGINE POWER. THE NTSB METALLURGICAL LABORATORY'S FINDINGS ON THE SEPARATED GEAR TEETH AND FLOATER GEAR REVEALED OVERSTRESS SEPARATION OF THE GEAR TEETH.
Probable Cause: a partial failure of the engine supercharger.
Accident investigation:
 |
|
Sources:
NTSB CHI95LA160
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 14:57 | ASN Update Bot | Updated [Time, Other fatalities, Source, Narrative, Category, Accident report] |
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