ASN Wikibase Occurrence # 358836
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| Date: | Monday 19 June 1995 |
| Time: | 14:40 LT |
| Type: | Bell 47J2A |
| Owner/operator: | Private |
| Registration: | N470RA |
| MSN: | 3719 |
| Year of manufacture: | 1966 |
| Total airframe hrs: | 6100 hours |
| Engine model: | LYCOMING VO-540-B1B3 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Elkhorn, WI -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | East Troy, WI (57C) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT REPORTED THAT HE WAS CRUISING AT ABOUT 1,000 FEET WHEN THE ENGINE LOST POWER. AN AUTOROTATION WAS INITIATED. DURING THE LANDING PHASE (CYCLIC FLARE), THE MAIN ROTOR STRUCK THE TAILROTOR DRIVE SHAFT. AN EXAMINATION OF THE ENGINE REVEALED THAT THE NUMBER TWO CYLINDER INTAKE VALVE HAD FAILED IN THE TOP RADIUS (NECK AREA) OF THE VALVE KEEPER RECESS, CAUSING DAMAGE TO THE CYLINDER COMBUSTION CHAMBER AND PISTON. AN INSPECTION OF THE ENGINE LOGBOOKS INDICATED THAT AN IDENTICAL FAILURE HAD OCCURRED EIGHT HOURS PREVIOUSLY. FURTHER INSPECTION REVEALED THAT THE MAJOR ENGINE OVERHAUL, WHICH HAD BEEN CONDUCTED 27 HOURS PRIOR TO THE ACCIDENT, HAD NOT BEEN PERFORMED IN ACCORDANCE WITH THE MANUFACTURER'S PROCEDURES AND SPECIFICATIONS.
Probable Cause: loss of power as a result of an intake valve failure due to improper maintenance performed during the major engine overhaul, and pilot misjudgment of the flare during autorotation.
Accident investigation:
 |
|
Sources:
NTSB CHI95LA187
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 18:42 | ASN Update Bot | Added |
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