ASN Wikibase Occurrence # 360164
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| Date: | Friday 15 July 1994 |
| Time: | 15:45 LT |
| Type: |  Pitts S-1S |
| Owner/operator: | Teresa & John Nagy |
| Registration: | N515TN |
| MSN: | 7-0255 |
| Total airframe hrs: | 144 hours |
| Engine model: | LYCOMING O-360-A4G |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Stevensville, MD -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | (3W3) |
| Easton, MD (KESN) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE AIRPLANE'S ENGINE LOST TOTAL POWER JUST AFTER TAKEOFF WHEN THE PILOT REDUCED THE THROTTLE. THE PILOT RE-APPLIED FULL THROTTLE WITH NO RESULT. DURING THE FORCED LANDING IN A FIELD, THE AIRPLANE'S WING STRUCK A TREE, AND THE AIRPLANE NOSED OVER. EXAMINATION OF THE ENGINE REVEALED THAT THE CRANKSHAFT GEAR (13S19646) BECAME DISCONNECTED FROM THE CRANKSHAFT DUE TO A BROKEN BOLT. METALLURGICAL EXAMINATION OF THE ACCESSORY GEAR RETAINING BOLT (P/N STD-2213), AND DOWEL PIN (P/N STD-1065) REVEALED THAT THEY SEPARATED AS A RESULT OF HIGH CYCLE FATIGUE MECHANISM, MOST LIKELY CAUSED BY INSUFFICIENT TORQUE OF THE BOLT.
Probable Cause: Inadequate maintenance by which undertorquing of the accessory gear retaining bolt resulted in fatigue failure of the bolt and the subsequent loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB NYC94LA129
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Mar-2024 18:37 | ASN Update Bot | Added |
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