ASN Wikibase Occurrence # 368298
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| Date: | Monday 31 July 1989 |
| Time: | 14:35 LT |
| Type: |  Bell 206B |
| Owner/operator: | Ca. Amer. Research Information |
| Registration: | N10857 |
| MSN: | 2974 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 2688 hours |
| Engine model: | Allison 250-C20-B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Rialto, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING A PRACTICE AUTOROTATION WITH A POWER RECOVERY, THE FLIGHT INSTRUCTOR HEARD A NOISE FROM THE REAR OF THE HELICOPTER. WHEN THE POWER RECOVERY WAS ATTEMPTED, THE ENGINE RESPONDED TO THE THROTTLE APPLICATION BUT THE LOW RPM WARNING HORN ACTIVATED AND THE HELICOPTER STRUCK THE GROUND IN A LEVEL ATTITUDE WHICH CAUSED THE MAIN ROTOR BLADES TO SEVER THE TAILBOOM. EXAMINATION OF THE HIGH SPEED OUTPUT DRIVESHAFT COUPLING, TRANSMISSION END, SHOWED THAT THE FOUR BOLTS WERE INSTALLED BUT THE FOUR NUTS AND FOUR WASHERS COULD NOT BE FOUND IN THE ASSEMBLY. TWO NUTS WERE FOUND IN THE SCUPPER DRAIN OF THE TRANSMISSION DECK.
Probable Cause: FAILURE TO INSTALL TWO OF THE FOUR REQUIRED NUTS WHICH RETAIN THE HIGH SPEED COUPLING INPUT DRIVE SHAFT TO THE TRANSMISSION.
Accident investigation:
 |
|
Sources:
NTSB LAX89LA253
History of this aircraft
Other occurrences involving this aircraft
| 23 May 2019 | N158H | HLW Aviation LLC | 0 | east of County Highway 3, north of Pittsfield, Pike County, IL | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Mar-2024 16:54 | ASN Update Bot | Added |
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